It is true that evolution occurs when new traits accumulate, but it is false that evolution only occurs when new traits accumulate. Evolution can occur when traits are lost. Some lineages adapt to their environments by becoming less complex over time.
Evolution is a process of change in the inherited traits of a population over time. This change can occur through the accumulation of new traits, but it can also occur through the loss of traits.
For example, some lineages of cave-dwelling animals have lost their eyesight over time because it was not necessary for survival in their environment. Similarly, some lineages of animals have become less complex over time, such as parasites that have lost certain body structures because they are not needed in their host-dependent lifestyle. Therefore, it is important to understand that evolution can occur through both the accumulation and loss of traits.
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Please help!!!
Which of these is MOST LIKELY an indication that cells may have become cancerous?
A. Cells undergoing slower rates of mitosis
B. Cells with few or no mutations
C. Cells not responding to checkpoints in the cell cycle
D. Cells with decreased rates of protein synthesis
Answer: Cells not responding to checkpoints in the cell cycle
Explanation: Cell cycle checkpoints are surveillance mechanisms that monitor the order, integrity, and fidelity of the major events of the cell cycle . So if they do not respond that indicates that something is wrong . The areas include the G1/S transition, where most cancer‐related defects occur, the G2/M checkpoint and its activation in response to DNA damage, and the spindle checkpoint.
The most likely indication that cells may have become cancerous is C, cells not responding to checkpoints in the cell cycle as cell cycle checkpoints are critical control points that ensure the proper progression of the cell cycle.
what is Cancer ?Cancer is a disease characterized by the uncontrolled growth and division of abnormal cells. Normally, cells in the body grow and divide in a controlled manner, with checkpoints in the cell cycle that ensure that the cell is ready to progress to the next stage of the cycle. These checkpoints ensure that DNA is replicated correctly and that the cell is ready to divide. In cancer cells, mutations can occur that disrupt the normal regulation of the cell cycle checkpoints.
Hence, he most likely indication that cells may have become cancerous is C, cells not responding to checkpoints in the cell cycle as cell cycle checkpoints are critical control points that ensure the proper progression of the cell cycle.
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If one detected blood in the urine; you would conclude that
Answer:
Blood in urine that can be seen with the eye may be a sign of advanced kidney, bladder or prostate cancer.
Answer:
advanced kidney, bladder or prostate cancer
Explanation:
which of the following statements about chloroplasts is false? thylakoids are usually arranged in stacks (grana). the stroma contains the enzymes responsible for the light-dependent reactions. the stroma is analogous to the matrix of the mitochondria. both the light-dependent (light) and carbon-fixation (dark) reactions occur in the chloroplasts. the role of chloroplasts is to capture light energy.
The stroma contains the enzymes responsible for the light-dependent reactions .This statement that is false about chloroplast .
Thylakoids are usually arranged in stacks (grana). The stroma is similar to the matrix of the mitochondria, but they do not perform the same function. The light-dependent reactions occur in the thylakoids, and carbon-fixation (dark) reactions occur in the stroma.The function of chloroplasts is to capture light energy and transform it into food through the process of photosynthesis. In addition, they are also responsible for providing a green pigment to plants that are responsible for their coloration.
However , The stroma contains the enzymes responsible for the light-dependent reactions this statement is false .
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what is a polypeptide? which monomers compose a polypeptide.
Answer:
A linear organic polymer consisting of a large number of amino-acid residues bonded together in a chain, forming part of (or the whole of) a protein molecule. The monomers that join to form polypeptides are amino acids.
q8. phylogenetic reconstruction can be obscured by homoplasy, rapid diversification, and introgression. for each of these complications, describe how researchers can identify them, and suggest a method to avoid the problem in order to create a robust phylogenetic tree.
Phylogenetic reconstruction can be obscured by homoplasy, rapid diversification, and introgression. These complications can make it difficult for researchers to accurately determine the evolutionary relationships between different species. However, there are ways to identify and avoid these problems in order to create a robust phylogenetic tree.
1. Homoplasy: Homoplasy occurs when two or more species have similar traits that are not due to common ancestry, but rather due to convergent evolution or parallel evolution. To identify homoplasy, researchers can use methods such as parsimony analysis or likelihood analysis.
These methods can help determine whether the similarity between traits is due to common ancestry or homoplasy. To avoid the problem of homoplasy, researchers can use multiple independent characters to reconstruct phylogenetic relationships.
2. Rapid diversification: Rapid diversification occurs when a group of species undergoes a burst of speciation events in a short period of time. This can make it difficult for researchers to accurately reconstruct the evolutionary relationships between these species.
To identify rapid diversification, researchers can use methods such as coalescent analysis or Bayesian analysis. These methods can help determine the likelihood of different phylogenetic relationships between species. To avoid the problem of rapid diversification, researchers can use multiple independent characters and incorporate fossil evidence to reconstruct phylogenetic relationships.
3. Introgression: Introgression occurs when two or more species hybridize and exchange genetic material. This can make it difficult for researchers to accurately reconstruct the evolutionary relationships between these species. To identify introgression, researchers can use methods such as genetic analysis or phylogenetic network analysis.
These methods can help determine the extent of gene flow between different species. To avoid the problem of introgression, researchers can use multiple independent characters and incorporate fossil evidence to reconstruct phylogenetic relationships.
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In order for an ovule (egg cell) in a flower to be fertilized and form a viable seed, pollination must occur. In this process, a sperm cell is delivered to the ovule when the pollen grain lands on the stigma and grows a tube, which enters the ovary and discharges the sperm cell to form a diploid zygote when it fuses with the egg cell. Although it only takes one pollen grain to successfully deliver sperm to the egg, numerous pollen grains are generally transferred to the stigma during insect pollination of flowering plants. Which phenotypic traits of pollen would you predict to be selected upon to promote survival and fitness within an insect-pollinated flowering plant?
The phenotypic traits of pollen that would likely be selected to promote survival and fitness within an insect-pollinated flowering plant include characteristics that make the pollen more attractive to the insects that will transfer it from one plant to another.
This may include traits such as size, shape, color, scent, and sugar content. For example, larger pollen grains may be easier for insects to collect and transfer, while a particular color or scent may be more attractive to a certain species of insect pollinator.
Additionally, pollen with a higher sugar content may be more attractive to insects as a food source, potentially increasing the likelihood of successful pollination. Overall, the traits that are selected will likely depend on the specific insects that are the primary pollinators for the plant species in question.
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What is heterozygous and homozygous????
Answer:
Homozygous and heterozygous are terms that are used to describe allele pairs. Individuals carrying two identical alleles (RR or rr) are known as homozygous. While individual organisms bearing different alleles (Rr) are known as heterozygous.
the main differences between hormonal coordination and nervous coordination (3 marks).
Hormonal coordination and nervous coordination are two different ways by which organisms regulate and coordinate their bodily functions.
What is nervous coordination?Nervous coordination is the process of communication and coordination between different parts of the body through the nervous system. The nervous system consists of neurons, which transmit electrical signals or nerve impulses from one part of the body to another. These impulses help in controlling and coordinating various functions such as movement, sensation, and cognition. Nervous coordination is responsible for rapid responses and reactions to internal and external stimuli.
Here,
The main differences between these two forms of coordination are:
Speed: Nervous coordination is much faster than hormonal coordination. Nervous impulses can travel at speeds of up to 120 meters per second, while hormones travel much more slowly through the bloodstream.
Duration: Hormonal effects last much longer than nervous effects. Hormones can continue to have an effect on the body for hours or even days, while nervous impulses are typically short-lived.
Specificity: Nervous coordination is very specific, meaning that it can target very precise areas or organs in the body. Hormonal coordination, on the other hand, is more general, affecting multiple organs or tissues throughout the body.
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Particles in a medium through which a sound wave is traveling _____.
move in a circular motion
move back and forth
move up and down
move randomly
Answer: so it move randomly
A mechanical wave that can be heard as it moves through a medium, such as air, and temporarily displaces the particles of the medium either by rarefaction or compression. reflection The bouncing back of a wave when it hits a surface through which it cannot pass.
Explanation:
What is a wave made of changing electric and magnetic fields that carries energy through matter or through empty space?
A wave made of changing electric and magnetic fields that carries energy through matter or through empty space; transverse; example: light.
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After 20 years, the plants in area A had a greater biomass than those in area B. Explain how abiotic (non-living) factors could cause this difference.
After 20 years, plants in zone A have higher biomass than plants in zone B due to abiotic factors such as (more) (sun) light, water/rainfall, photosynthesis and warmer/higher temperatures .
Abiotic factors are the non-living components of an ecosystem that affect its environment. Examples could be light, water and temperature in terrestrial habitats. The abiotic elements of marine ecosystems are salinity and ocean currents.
In addition to photosynthesis, the following abiotic factors can also cause plant differences:
1. (more) light (from the sun);
2. water/rain;
3. warmer/higher temperature;
4. enzymes;
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Honor biology transport problems please help
Transportation is the movement of substances from one place to another, including water, nutrients, waste material, and excretory products.
What is transportation in biology?In biology, the term "transport" describes the action of moving a particle or ion across a cell barrier or through the circulation. In this respect, there are two different kinds of transportation: passive transportation and active transportation. An area of greater concentration is moved to an area of lower concentration through the process of passive transport, which involves the movement of ions or molecules along a concentration gradient.
Passive movement can be divided into four main categories: diffusion, assisted diffusion, filtration, and osmosis. Ions or molecules travel in opposition to a concentration gradient during active transport.
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Everything is made of tiny atoms. Each of these atoms is made up of a core that has a positive charge, and some electrons that circle around the core. These have a negative charge. When these electrons move around in a substance and between substances, an _______________ is created.
A. uneven charge
B. even charge
When electrons move around in a substance and between substances, a uneven charge is created.
option A.
What happens when electrons move around in a substance?When electrons move around in a substance or between substances, they can create an uneven distribution of electric charge, leading to the creation of an electric field. An electric field is a physical field that surrounds an electrically charged object and is capable of exerting a force on other charged objects within its vicinity.
The movement of electrons within and between substances can lead to the creation of an electric field and an uneven distribution of electric charge.
Thus, when these electrons move around in a substance and between substances, a uneven charge is created.
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Answer: A. uneven charge
Explanation:
the somatic cells of a particular plant each contain a total of 46 chromosomes. how do the chromosomes of this plant differ from the chromosomes of humans, who also have a total of 46
The chromosomes of the plant and humans may differ in their structure, size, and genetic content.
While both the plant and human cells have a total of 46 chromosomes, the specific chromosomes and their genetic information vary between species. In humans, the 46 chromosomes consist of 22 pairs of autosomes and 1 pair of sex chromosomes (XX in females and XY in males). These chromosomes carry the genetic information that determines various traits and characteristics. In contrast, plant species may have a different arrangement of chromosomes, with variations in the number and structure of the chromosomes.
Therefore, it is important to note that the specific differences in chromosome composition and genetic information can vary significantly between different plant species and humans.
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4. Solve this dihybrid Punnett square problem. In Pea Plants T is the allele for the dominant, tall characteristic; t is the allele for
the recessive, short characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive,
green color characteristic. Cross two pea plants that are heterozygous for
both height and seed color. Determine the genotypes of the offspring.
Calculate the phenotypic ratio of the offspring.
How many will be tall and yellow?
How many will be tall and green?
How many will be short and yellow?
How many will be short and green?
A phenotypic ratio is a numerical comparison of two phenotypes that demonstrates how frequently the occurrence of one trait corresponds with another.
Which allele for tall pea plants is dominant?As the yellow seeds are dominant to green, the allele for yellow seeds should be indicated with upper case letter while the one for green seeds should be written in lower case letter. Assume that Y is the allele for yellow seeds and y is the allele for green seeds.
The genotype of the heterozygous yellow-seeded plant will thus be "Yy," whereas the genotype of the green-seeded plant will be "yy" (as the recessive allele is expressed only in homozygous conditions). The cross between heterozygous yellow seeded plant and green seeded plant will produce 50% yellow seeded plants and 50% green seeded plants.
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Explain how plants obtain the materials they need for cellular respiration. Be specific! How do these materials get from the environment to the mitochondria? And Explain how consumers, such as otters, obtain the materials they need for cellular respiration. Be specific! How do these materials get from the environment to the mitochondria?
Plants obtain the materials they need for cellular respiration from a mechanism called photosynthesis, which involves the generation of biomolecules in the chloroplast while animals such as otters obtain the materials they need for cellular respiration from biomolecules of other organisms as they are heterotrophs.
What are autotrophs and heterotrophs in an ecosystem?Autotrophs and heterotrophs in an ecosystem are organisms that obtain required biomolecules as nutrients on their own and others, respectively, which are required to produce energy by cellular respiration.
Therefore, with this data, we can see that autotrophs and heterotrophs obtain energy by different methodologies.
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Differentiate between the way in which muscle cells and cells of sensitive plant change their shape
Muscle cells change their shape by contracting and relaxing due to the movement of actin and myosin filaments, while cells of sensitive plants change their shape through thigmonasty, which involves the rapid movement of water into specialized cells.
Muscle cells change their shape by contracting and relaxing, which is enabled by the movement of actin and myosin filaments within the cell. These filaments slide past each other, causing the muscle cell to shorten and thicken. This movement is controlled by the nervous system and allows for movement and force generation in the body.
On the other hand, cells of sensitive plants change their shape through a process called "thigmonasty." When a sensitive plant is touched or shaken, specialized cells within the plant release potassium ions, causing water to rapidly move into these cells. This rapid influx of water causes the cells to swell and change shape, which can lead to the plant closing its leaves or bending its stems. Thigmonasty is a mechanism used by plants to protect themselves from predators or environmental stressors.
In summary, muscle cells change shape by contracting and relaxing due to the movement of actin and myosin filaments, while cells of sensitive plants change shape through thigmonasty, which involves the rapid movement of water into specialized cells.
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while they look very different, the eastern lowland gorilla and madame berthe's mouse lemur both share primate traits. what are two traits they have in common?
The two traits that the Eastern lowland gorilla and Madame Berthe's mouse lemur share are: highly advanced cognitive abilities and a social structure.
The trait that the Eastern Lowland gorilla and Madame Berthe's mouse lemur have in common is that both are primates. They are both animals in the order of Primates, which includes humans. The first trait is that these animals belonging to the primate group are distinguished by their highly advanced cognitive and sensory abilities.
The animals in this group are all quadrupeds, which means they walk on four legs. The second trait the Eastern lowland gorilla and Madame Berthe's mouse lemur have in common is that both are social animals. These animals have a highly social structure that is maintained through communication, the sharing of resources, and the protection of the group's members.
They share a range of physical and behavioral characteristics, such as intelligence and complex social systems, that enable them to live in complex societies. Besides these traits, the Eastern Lowland gorilla and Madame Berthe's mouse lemur are very different. The Eastern lowland gorilla is a very large primate that lives in the dense tropical rainforests of Central Africa.
Madame Berthe's mouse lemur is a small, nocturnal primate that lives in the dry forests of Madagascar.
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The correct option is C; The population reached carrying capacity and stabilized .
What happens if a population reaches carrying capacity?If a species' population surpasses its carrying capacity, the ecosystem may become unfit for survival. If the population outnumbers the carrying capacity for an extended length of time, resources may be destroyed totally. If all resources are depleted, populations may perish.
Biologists frequently use graphs to demonstrate population growth patterns. An "s" shaped graph shows that the population has reached its carrying capacity. In this logistic (S-curve) model, population growth is proportional to population size but also to available resources. Limited resources cause competition and poorer growth rates at increasing population densities. Ultimately, the population stabilizes and the growth rate falls to zero.
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transduction refers to the . group of answer choices disappearance of visual stimuli. translation of one form of energy to another. transmission of sensory signals to the cortex. perception of lights.
Transduction refers to the translation of one form of energy to another.
What is Transduction?Transduction is the method of converting a physical energy stimulus into an electrical signal that can be transmitted through the nervous system. It is the process of converting one form of energy into another, specifically, converting physical stimuli into an electrical signal that can be transported via the nervous system.
Transduction allows sensory neurons to detect energy, such as light or sound waves, and convert it into an electrical signal that is then transported to the central nervous system. This electrical signal can then be interpreted by the brain, allowing us to detect and perceive the world around us.
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6. The diagram below summarizes some of the steps in the development of humans. O + O D A B C All the genetic information needed for the organism to develop is first present at
All the genetic information needed for the organism to develop is first present in the fertilized egg.
What is a fertilized egg?A fertilized egg, also known as a zygote, is the initial stage of development of a new organism that occurs when a sperm cell penetrates and merges with an egg cell.
This process is called fertilization or conception, and it results in the formation of a single cell that contains all the genetic material necessary to create a new individual. The fertilized egg then begins to divide and differentiate into specialized cells and tissues, eventually forming a fully developed organism
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Besides storage, what does a vacuole provide in a plant cell?
Answer:
Help Maintain water balance.
Explanation:
The plant vacuole can store minerals, water, etc. But also, the plant vacuole can regulate water balance.
explain why you have trouble seeing colors as clearly at night as you do during the day
Cones and rods are both gentle. The rods let us see in extremely low light but do not allow the detection of light, whereas the discs allow us see tint but do not work in low light. Cones lose their capacity to react to light when it turns dark.
Why is nighttime colour vision so challenging?Cones & rods are both light-sensitive. The rods let us to see in extremely low light but do not permit the detection of colour, whereas the cones provide us to see colour but do not function in low light. Cones lose their capacity to react to light as it gets dark.
Why am I unable to see properly at night?Nyctalopia, often known as night blindness, is the inability to go see well at nighttime or in dimly lit environments like a restaurant or theatre. It is frequently linked to a difficulty to swiftly adjust from a brightly light to a dimly lit area.
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What are cycles and conservation
Answer:As energy moves through an ecosystem, it changes form, but no new energy is created. Similarly, as matter cycles within an ecosystem, atoms are rearranged into various molecules, but no new matter is created. So, during all ecosystem processes, energy and matter are conserved.
Explanation:
in what way is the pupil reflex different from some other reflexes?
A A change in the environment causes impulses in the sensory neurone
B The function of the reflex is protective
C The relay neurones are in the brain
D The response occurs quickly
Answer: The Answer is A
Explanation:
How is churning method useful? Explain.
Answer: Churning physically agitates the cream until it ruptures the fragile membranes surrounding the milk fat. Once broken, the fat droplets can join with each other and form clumps of fat, or butter grains.
Explanation: It physically agitates the cream until it ruptures the fragile membranes surrounding the milk fat. Once broken, the fat droplets can join with each other and form clumps of fat, or butter grains.
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Identify the region on the temporal bone that forms much of the zygomatic arch
what are the three distinguishable regions of the body of a mollusk? group of answer choices muscular foot centrally concentrated visceral mass periostracum fleshy mantle
The three distinguishable regions of the body of a mollusk are the muscular foot, the centrally concentrated visceral mass, and the fleshy mantle.
Mollusks are soft-bodied animals with hard shell that is often visible. Their bodies are bilaterally symmetrical, which means that their left and right sides are identical. Mollusks come in a variety of shapes and sizes and can be found in a variety of environments. Mollusks are an extremely diverse group of animals, including clams, snails, and squids.
The three distinguishable regions of the body of a mollusk are:
Muscular foot: This is the part of the mollusk's body used for movement, which is located at the base of the animal.
Centrally concentrated visceral mass: This is part of the mollusk's body that contains internal organs, such as the heart, digestive system, and reproductive system.
Fleshy mantle: This is a fold of tissue that covers the visceral mass and is responsible for the production of the mollusk's shell. In some mollusks, the mantle also has other functions, such as respiration or the secretion of mucus for locomotion.
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Cross a plant that is heterozygous for axial flowers with a plant that has terminal flowers. What is the genotypic and phenotypic ratio
The progeny will have a 1:1 phenotypic ratio, with 50% of the offspring displaying axial flowers (Aa) and 50% displaying terminal flowers (aa).
When crossing a plant that is heterozygous for axial flowers (Aa) with a plant that has terminal flowers (aa), we need to consider the possible gametes that each parent can produce.
The heterozygous plant (Aa) can produce two types of gametes, one with the dominant allele A and one with the recessive allele a. The plant with terminal flowers (aa) can only produce gametes with the recessive allele a.
To determine the genotypic ratio of the offspring, we can use a Punnett square. The Punnett square will have two rows representing the possible gametes of each parent and two columns representing the possible alleles for the offspring.
A a
a Aa aa
a Aa aa
From the Punnett square, we can see that there are two possible genotypes for the offspring: Aa and aa. Each of these genotypes has a 50% chance of occurring. Therefore, the genotypic ratio of the offspring is 1:1 (Aa:aa).
To determine the phenotypic ratio of the offspring, we need to consider the expression of the dominant allele A. The dominant allele A causes axial flowers, while the recessive allele a causes terminal flowers. Since the heterozygous plant has one copy of the dominant allele A, it will exhibit the axial flower phenotype. Therefore, only the offspring with the aa genotype will exhibit the recessive terminal flower phenotype.
Thus, the phenotypic ratio of the offspring will be 1:1, with 50% of the offspring exhibiting axial flowers (Aa) and 50% exhibiting terminal flowers (aa).
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Scientists Are concerned that melting glaciers are exposing long frozen animals. Which the ice melts, the animal style and begin to decompose. How will this affect the amount of CO2 in the atmosphere?
Carbon dioxide levels in the atmosphere rise as a result of decomposition.
Decomposition has a significant impact on the amount of carbon dioxide in the atmosphere because it releases carbon dioxide into the atmosphere, adding to the already existing carbon dioxide.
As the earth's atmosphere becomes warmer as a result, we can infer that the decomposition process causes a rise in the atmospheric concentration of carbon dioxide gas. The melting of glaciers that exposes long-frozen animals could potentially increase the amount of carbon dioxide (CO2) in the atmosphere.
When an organic matter like plants and animals decomposes, they release CO2 into the atmosphere through a process called respiration. If these animals were to decompose rapidly, as may happen if they are exposed to warm temperatures due to melting glaciers, the amount of CO2 released could increase.
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A breed of chicken shows incomplete dominance for feather color. One dominant allele codes for black feathers, another dominant allele codes for white feathers. The feathers of heterozygous chickens of this breed will be