Which of the following changes takes place during the first trimester of awoman's pregnancy?A. The placenta attaches to the mother and nourishes the growingfetus.B. The fetus begins rhythmic breathing movements.C. The mother feels the fetus move for the first timeD. The fetus develops toenails, lips, and eyelashes.
Answers
We know as the first trimester of the pregnancy the period from conception to the 12 weeks of pregnancy.
Around 24 hours after the fertilization, the zygote becomes a blastocyst, which implants into the uterine wall. Then it becomes an embryo and during this stage, the placenta and umbilical cord are also formed.
The embryo becomes a fetus around 8 weeks after conception, and by this stage, fingers, eyes, mouth, and ears begin to be recognizable.
Of the options, the one which better aligns with the events of the first trimester is A. The placenta attaches to the mother and nourished the growing fetus.
Related Questions
prophase of meiosis i has some important differences from prophase of mitosis. these differences include: ______ pair, and ______ occurs.
Answers
The prophase of meiosis I have a few essential variations from the prophase of mitosis. those differences include Homologous chromosomes pair, and crossing over takes place.
Mitosis is the department of frame cells and meiosis is the division of the sex cells or gametes-producing cells.
Mitosis is a process wherein a single cell divides into identical daughter cells. Whereas Meiosis is a technique in which a single cell divides twice to produce 4 cells containing 1/2 the initial quantity of genetic materials.
Meiosis I, the primary meiotic division, begins with prophase I. For the duration of prophase I, the complex of DNA and protein referred to as chromatin condenses to shape chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and they remain joined at the center known as the centromere.
Prophase is the primary segment of mitosis, the manner that separates the duplicated genetic material carried within the nucleus of a discern cell into identical daughter cells. During prophase, the complex of DNA and proteins contained inside the nucleus referred to as chromatin condenses.
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Which is the most inclusive division of time on the geologic time scale?A. epochB. periodC. eraD. eon
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The most inclusive division of time is the eon, which can be Archean, Proterozoic, Phanerozoic and they are divided into eras (Early/Middle/Late for the Archean and Proterozoic, Paleozoic, Mesozoic and Cenozoic for the Phanerozoic). Therefore, the correct answer is D. eon.
what happens when change in the dna is not repaired in a cell that will become an egg or sperm?
Answers
What happens when a change in the DNA of an egg or sperm is not repair will depend on the location of the mutation. This means that whether the changed DNA region is a gene, a regulating sequence or "junk" DNA, the cell can survive or not. In case it survives, the replaced nucleotide may not altere the protein it codifies, resulting in a silent mutation, or it can cause altereations in the functioning even though not being lethal.
the earth orbits the sun true or false
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Earth rotate in an orbit around the sun. It takes 365 days, 6 hours, 9 minutes for the earth to complete its revolution around the sun. Its directional rotation to the sun is counterclockwise. Leap year is scheduled on the 6 hours, 9 minutes which is an additional 24 hour every fourth year.
Answer - True
George Murdoch's research indicated that which one of the following is a cultural
universal?
A.astronom
B.war
C.medicine
D.all of these
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please answer for me ASAPP!! i need help. thank uu
Answers
the topsoil is the most fertile layer of the soil, in this layer there are a great amount of nutrients and microorganisms that allow the adequate growth of plant organisms. This is why the loss of topsoil after deforestation leads to desertification.
Since topsoil is a nutrient-rich soil, it would allow the growth of plant organisms again even though it is an area exposed to mining processes. Therefore, the answer would be the B option.
Answer:the topsoil is the most fertile layer of the soil, in this layer there are a great amount of nutrients and microorganisms that allow the adequate growth of plant organisms. This is why the loss of topsoil after deforestation leads to desertification.Since topsoil is a nutrient-rich soil, it would allow the growth of plant organisms again even though it is an area exposed to mining processes. Therefore, the answer would be the B option.
Explanation:
What is theory in science means
Answers
Solution:
Scientists use conceptual processes to understand nature through questions or propositions.
The method on which scientific investigations are based is the scientific method and it is the hypothesis-prediction approach.
This approach allows scientists to modify their conclusions as new information becomes available.
The method consists of five steps:
1. Make observations
2. Ask questions
3. Form hypotheses, which are tentative answers to questions.
questions
4. Make predictions based on the hypotheses
5. Test the predictions by making additional observations or conducting experiments.
If the test results support the hypothesis, it is subjected to additional predictions and tests. If they continue to support it, confidence in its correctness increases and the hypothesis comes to be considered a theory.
Therefore, a theory is a demonstrable model supported by experimentation (empirical facts) and data that explains a phenomenon. In other words, a theory is a set of concepts, including abstractions of observable phenomena and quantifiable properties, along with rules that express the relationships between observations of those concepts.
the chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?
Answers
the chloroplasts of land plants are thought to have been derived according to evolutionary sequence:
cyanobacteria → green algae → land plants
A population's genetic makeup evolves throughout time as a result of the process of evolution. Adaptations made by organisms to their altering surroundings are reflected in evolution, which can lead to changed genes, unique features, and the emergence of new species. Both increases in genetic diversity and shifts in allele frequencies throughout time affect evolutionary processes. Experimentally, the evolutionary process from a "Big Bang" genesis to the protocell and from the advent of the protocell and a diversity of species to Darwin's mental capacity (mind) and society is being reexamined (The Descent of Man). The focus on endogenous ordering is one of studies' most fundamentally revisionary effects.
This concept has had a fresh influence on the notion of Darwinian evolution and has been discovered to apply to the whole sequence. It is well demonstrated in the orderly copolymerization of amino acids. I'll go through a few issues with handling the teaching of contentious themes in this section.
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I need help with this practice problem solving The subject is the invasive speciesKudzu Review the pic, the answer^
Answers
Answer
Kudzu kills native plants by smothering them and blocking their sunlight. Climbing vines can girdle trees, and their weight can uproot trees. Loss of trees and plants to kudzu threatens agricultural and timber production. Kudzu would destroy the native species. Few plants can survive once smothered by kudzu and small ecosystems can be radically altered. Infestations quickly spread in open habitats, rapidly covering the soil and low growing vegetation, and only slowed by adjoining forests. Kudzu can affect indigenous plants and completely modify the structure of the ecosystem.
Kudzu is widely believed to drastically reduce biodiversity because of its ability to smother other vegetation and develop large-scale monocultures. It can climb overtop and subsequently kill new seedlings or mature trees. Forestry problems associated with aggressive vines such as kudzu include mortality of edge trees, exclusion of native plant species, and potential to increase fire hazard during winter.
This table suggests that: A. a pH of 9 is the optimal pH for all enzymatic reactions. B. enzymes have particular pH's at which they function best. C. reactions proceed at the same rate for all enzymes. D. as the pH increases, the reaction rate always increases.
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The answer to this question is B. enzyme have particular pH's at which they function best, since we can see both enzymes at different pH values, have different reactions rates: considering enzyme 1, the highest reaction rate is in pH 10, and considering the enzyme 2, the highest reaction rate is in pH 9.
The Gulf of Mexico dead zone that forms each summer at the mouth of the Mississippi River is caused largely by the input of agricultural fertilizers. Many scientists advocate restoring wetlands (as well as creating them) as a strategy to reduce the severity and extent of the dead zone. The idea is that plants in healthy intact wetlands will remove these nutrients from the water (during growth) and prevent their washing into the river and the Gulf of Mexico. List at least two potential benefits to this strategy, as opposed to a more traditional chemical intensive approach such as that used at most waste water treatment plants.
Answers
1. Restoring wetlands could be cheaper in the long run, once the ecosystem is restored it maintainace will not be as costly as that of water treatment plants.
2. This strategy also will be benefical for biodiversiy conservation and would bring ecosystems services to surrounding communities.
Help asap.
1. What is the structure of the brain that helps coordinate the movement of muscles in the body?
A.cerebellum
B.midbrain
C.hypothalamus
D.pons
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Answer:
A. the cerebellum help coordinate the movement of the muscles in the body.
I need help with this answer it’s a bit tricky
Answers
Correct option is number four, all current organisms share a common ancestor. Which is one of the backbones of its evolutionary thinking.
Which term describes an organism that remains in one place?
Answers
Sessile is the term used to describe an organism that remains in one place.
Why are some organism sessile?
Some animals such as corals and sponges are sessile. These animals don't expend their energy to catch their prey they live by attaching to a substrate. They choose a suitable spot to feed. They can be found on tree trunks, on rocks, and even in water.
Plants are typical example of sessile organism. They permanently grow in one spot taking nutrients from the soil and making use of the available sun for photosynthesis. Sessile organism doesn't have the ability to move from one place to another and it has a big advantage as they save energy and they also develop unique feeding mechanisms enabling them to survive in their habitat.
In summary, sessile organisms don't move yet they feed by attaching themselves to a substrate.
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Base your answers to questions 1 and 2 on the diagram below, which represente a metabolic process and on your knowlege of biology. the letter x in the process represents
x
□+□+□+□-> starch
1. an antibody
2. a receptor
3. a hormone
4 a enzyme
Answers
(1) An antibody is a representation of one of the following metabolic processes.
What is the metabolic process?Metabolism is the collective name for the set of chemical reactions that sustain life in organisms.
Converting the energy in meals into energy that may be used to power cellular processes is one of metabolism's three main tasks.
Metabolic reactions occur in particular regions of the cell.
The cytoplasm is also the site of glycolysis, fatty acid synthesis, and glycogen synthesis in addition to several stages of amino acid breakdown.
Different metabolic pathways have specific locations within the mitochondria.
Chemical reactions within the cell transform food into energy.
Our bodies need this energy in order to move, think, and develop.
Specific proteins in the body control the chemical reactions involved in metabolism.
Therefore, (1) an antibody is a representation of one of the following metabolic processes.
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If your nanodrop is giving you a plasmid DNA concentration of 178.9 ng/µL what is the volume of sample, you need to take in order to have 10 ng DNA final concentration?
Please help!!
Thanks.
Answers
The volume of the solution is obtained as 0.056 µL.
What is the concentration?We know that the term concentration refers to the amount of substance that is present in a sample. In this case, we are told that you have a plasmid DNA concentration of 178.9 ng/µL. We are now being asked for the volume of the sample that is needed so that we can have 10 ng DNA final concentration.
Let us now look at the parameters that we have from the question and these are;
Concentration = 178.9 ng/µL
Mass of the sample = 10 ng
Volume of the sample = ???
We know that the volume is going to be obtained as the ratio of the mass to the concentration of the solution from the data that we have and have been itemized in detail above.
Given that we have;
Volume = mass/concentration
Volume = 10 ng /178.9 ng/µL
Volume = 0.056 µL
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What type of energy powers the process of photosynthesis?
Answers
Answer:
Chemical Energy
5. What is it called when molecules move across the cell membrane from an area of high concentration to an area of low concentration through a carrier protein?O a Facilitated DiffusionO b. DiffusionO c Passive TransportOd Osmosis
Answers
Facilitated Diffusion
Which type of mutation speaks produces a stop condon?
Answers
Answer:
nonsense mutation
Explanation:
Water molecules evaporate from a lake near the equator and rise into the atmosphere, as shown in the diagram belowAs the molecules travel away from the equator, which step in the water cycle is most likely to happen next?
A) The molecules freeze and eventually form ice crystals
B) The molecules heat up and eventually form water vapor
C) The molecules cool and eventually form clouds
D) The molecules break apart and eventually form precipitation
Answers
Answer:
The answer is C) The molecules cool and eventually form clouds
Explanation:
Which is a three nucleotide sequence?
A. Gene
B. Codon ile A
C. Complement
D. Chromosome
Answers
FORENSIC SCIENCE - EASY
If you were investigating a crime and received a genetics report, which would be the most useful characteristic in helping identify the suspect?
Blood type
Brown hair
Blonde hair
Blue eyes
Answers
what is a colony forming unit and how is it used to infer microbial numbers in a sample?
Answers
Explanation:
A colony forming unit, or CFU, is a unit commonly used to estimate the concentration of microorganisms in a test sample. The number of visible colonies (CFU) present on an agar plate can be multiplied by the dilution factor to provide a CFU/ml result.
A measure of the quantity of viable colonogenic cells per milliliter is called a colony forming unit (CFU). These give an idea of how many cells are still alive and able to divide and create small colonies.
What are the colony forming unit and infer microbial?Colony-forming unit (CFU, cfu, or CFU) is a unit used in microbiology to measure the number of viable microorganisms (bacteria, fungi, viruses, etc.) in a sample that can multiply through binary fission under controlled conditions.
Colony forming units, or CFUs, are frequently used to calculate the number of microorganisms present in a test sample.
A CFU/ml result can be obtained by multiplying the number of visible colonies (CFU) present on an agar plate by the dilution factor.
Therefore, A colony forming unit, or CFU, is a unit commonly used to estimate the concentration of microorganisms in a test sample.
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explain the role of biotechnology in agriculture?
Answers
Biotechnology, at its most basic, is biology-based technology; biotechnology harnesses cellular and biomolecular processes to develop technologies and products that improve our lives and the health of our planet. The primary goal of modern biotechnology in agriculture is to improve the quality, quantity, nutrition, taste, and shelf life of produce, allowing stakeholders to achieve higher yield with lower energy costs.
This includes ancient agricultural processes such as fermentation as well as more recent examples of developing disease-resistant plant varieties through crossbreeding. Modern methods for improving agricultural practices through biotechnological progress include transgenic techniques, which revolve around the insertion of foreign DNA strands into the host genome to increase crop yield.
Agriculture biotechnology benefits include increased crop yield, reduced crop vulnerability to environmental stresses, improved nutritional qualities of food crops, improved taste, texture, or appearance of food, and reduced reliance on fertilizers, pesticides, and other agrochemicals.
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Of the most common cancers, which are the top 3 for 5-
year relative survival? Which are the bottom 3?
Answers
Answer:
Top 3 cancers for 5 years survival are:
1. Melanoma
2.Hodgkins lymphoma
3. Breast cancer
Bottom 3 cancers for 5 years survival are:
1. Mesothelioma
2.pancreatic cancer
3. Brain cancer
Explanation:
Prognosis describes how serious your cancer is and your chances of survival. 5-year survival means the percentage of people who will be alive 5 years after diagnosis.
Which of the following best describes hearing receptor "hair cells"?
a. They are neurons.
b. They lack ion channels.
c. They are epithelial, but function like neurons.
d. They are made of keratin.
Answers
Answer:B
Explanation:Science
Hair cells best describe as they are epithelial, but function like neurons
What are hair cells ?The basic sensory receptor cells in the inner ear, known as hair cells, transduce, or change into electrical impulses that are sent to the brain, mechanical sensations generated by sound and head motions.
The sensory receptors of the auditory and vestibular systems in the ears of vertebrates are found in hair cells, which are distinguished by the stereocilia bundle at their apical surface. Mechanical impulses are converted into electrical activity by hair cells.Due to the hair-like cilia—stiff, nonmotile stereocilia and flexible, motile kinocilia—that extend from the apical ends of the sensory cells, they are known as hair cells. The vestibulocochlear nerve's superior, or vestibular, division is where the nerve fibres originate.Learn more about Hair cells here:
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Does diffusion take place in the nervous system? if it does, how so?
Answers
Answer:
In living things, diffusion allows substances to move in and out of cells. It's how red blood cells distribute oxygen through the body. When empty blood cells enter the lungs, which have an extremely high concentration of oxygen, the molecules pass into the blood cells, filling them up.
Explanation:
When looking at a stalk of celery that has been sitting in red food-coloredwater. Sarah notices the celery has red lines running through it. Why is thispossible?The roots absorbed the water.The stomata allowed the water in.The xylem transported the water through the stem and to the leaves of the plant.The phloem transported the water through the stem and to the leaves of the plant.
Answers
The xylem is a special tube of the plant that take up the red food coloring. The food coloring travels into the stem and into the leaves of the celery. It is increased by vaporization from the leaves of the celery. It is like blood exploring through the human body. This shows how the plants deliver the nutrients it absorb to all its parts.
Answer - Option 3 - The xylem transported the water through the stem and to the leaves of the plant.
The function of most proteins depends primarily on the?
Answers
The function of most proteins depends primarily on the Tertiary structure which formed by peptide bond, hydrogen bond, covalent bond, and disulphide bond.
Protein Structure- The three-dimensional configuration of an amino acid-chain molecule's atoms is known as protein structure. Segments of amino acids, the polymer's monomers, are used to create proteins, specifically polypeptides. A single amino monomer can also be referred to as a residue, which denotes a polymer's repeating unit.
Peptide Bond- Whenever the carboxyl group with one molecule combines with amino amino group of another molecule, the outcome is the production of an amide group and a water molecule, which is known as a peptide bond.
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What’s the correct answer answer asap for brainlist