Answer:
Explanation:
A Human cell has 46 chromosomes. (I’ll use humans to keep things simple). In sexual reproduction both humans have 23 chromosomes, in their sex cells. (Men have 23 in a sperm and women have 23 in an egg cell). These half cells merge to create 1 unique cell, that has characteristics of both male and female. The cells multiply and then a baby is born with a unique set of genes. These cause variations, and remember these variations can carry from generation to generation. As for how variations can increase a chance for survival, variations allow unique gene sets to be made, so that in case of a disease (in this case I’ll use a disease, but it could also include harsh environmental conditions), these unique gene sets may give an individual natural immunity to the disease. How can a variation decrease an organisms chance for survival? Well, s there are many ways that a unique gene set can make it difficult to survive. For example a genetic disease your family has had a history with. These diseases include, but are not limited to, cancer, diabetes, and schizophrenia.
research and tell the story about a case in which bones helped identify a missing person or helped solve a crome
Answer:
footsteps
Explanation:
the bones leave footsteps in the ground and that is what detectives use to solve a missing or help solve a crimescene
b) How does the thermal energy of solid water change as it melts?
Answer:
Hi! So solid water would be ice, the particles in ice are very close together which makes it firm and makes it ice. When you put the ice in the microwave, (Microwave has heat so it would be thermal energy!) the particles in the ice mover a tiny bit away from each other which then makes it water. Then, if you boil the water, the particles that are in the water move far away from each other and it turns into steam!
Hope this helps!! Stay safe! <3
PLSSSS HELPP IT IS DUE IN 10 MINS!! I WILL GIVE BRAINLIEST!
If Cytosine makes up 33% of a DNA sample, what percentage of the DNA is made up of thymine containing nucleotides?
Answer:
Since cytosine and guanine are present in equal amounts, we can simply divide their sum by 2. The final composition is 22% adenine, 22% thymine, 28% cytosine, and 28% guanine.
Explanation:
Which one of the codons below would stop the translation of mRNA by ribosomal subunits?
UAG, UAA, UGA
AUG, ATG, GTU
CUG, AUG, GUA
ATG, AAG, AAA
CUG hope this helped!!!!!
Answer:
CUG,AUG,GUA
Explanation:
What is the smallest unit ?
Answer: B) cell
the smallest unit of life is a cell
Name and describe the five types of active transport systems.
Answer:
Please Mark as Brainliest. Please!!!!!!!!!!
Explanation:
Definition
Active transport is the process of transferring substances into, out of, and between cells, using energy. In some cases, the movement of substances can be accomplished by passive transport, which uses no energy. However, the cell often needs to transport materials against their concentration gradient. In these cases, active transport is required.
Active transport requires energy to move substances from a low concentration of that substance to a high concentration of that substance, in contrast with the process of osmosis. Active transport is most commonly accomplished by a transport protein that undergoes a change in shape when it binds with the cell’s “fuel,” a molecule called adenosine triphosphate (ATP).
For example, one type of active transport channel in the cell membrane will bind to the molecule it is supposed to transport – such as a sodium ion – and hold onto it until a molecule of ATP comes along and binds to the protein. The energy stored in ATP then allows the channel to change shape, spitting the sodium ion out on the opposite side of the cell membrane. This type of active transport directly uses ATP and is called “primary” active transport.
Another type of active transport is “secondary” active transport. In this type of active transport, the protein pump does not use ATP itself, but the cell must utilize ATP in order to keep it functioning. This will be explained in more depth in the section on Symport Pumps below.
Lastly, active transport can be accomplished through processes called endocytosis and exocytosis. In exocytosis, a cell moves something outside of itself in large quantities by wrapping it in a membrane called a vesicle and “spitting out” the vesicle. In endocytosis, a cell “eats” something by wrapping and re-forming its membrane around the substance or item.
Each type of active transport is explained in more detail below.
Types of Active Transport
Antiport Pumps
Antiport pumps as an example of active transport
Active transport by antiport pumps
Antiport pumps are a type of transmembrane co-transporter protein. They pump one substance in one direction, while transporting another substance in the opposite direction. These pumps are extremely efficient because many of them can use one ATP molecule to fuel these two different tasks.
One important type of antiport pump is the sodium-potassium pump, which is discussed in more detail under “Examples of Active Transport.”
Symport Pumps
Symport pumps take advantage of diffusion gradients to move substances. Diffusion gradients are differences in concentration that cause substances to naturally move from areas of high to low concentration.
In the case of a symport pump, a substance that “wants” to move from an area of high concentration to low concentration down its concentration gradient is used to “carry” another substance against its concentration gradient.
One example of a symport pump – that of the sodium-glucose transport protein – is discussed below under “Examples of Active Transport.”
Sympoter pump as an example of active transport
Active transport by symporter pumps
Endocytosis
In the third type of active transport, large items, or large amounts of extracellular fluid, may be taken into a cell through the process of endocytosis.
How are chloroplasts like mitochondria?
Group of answer choices
They both contain DNA.
They are both found in animal cells.
They look alike.
They can both use energy from sunlight.
Answer: Chloroplasts, like mitochondria, produce energy for plant cells. Both mitochondria and chloroplasts have their own circular DNA and can function independently of the eukaryotic host cell. Hope this helps! I don't like giving direct answers I feel you should have a chance to learn.
Explanation:
According to the Cell Theory, what is NOT one of the three main tenants?
1. viruses - which are not alive - not made of cells
2. The cell is the smallest living unit in all organisms
3. All living things are made of cells
4. All cells come from other pre-existing cells
which best explains the mechanism that allows for cell differentiation ?
Answer:
Cellular differentiation
Explanation:
~PLEASE HELP ME~
The warming of the atmosphere by the trapping of heat being radiated to space is called
a)condensation
b)evaporation
c)the greenhouse effect
d)radiation
Answer:
The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would be without an atmosphere. Solar energy absorbed at Earth's surface is radiated back into the atmosphere as heat. As the heat makes its way through the atmosphere and back out to space, greenhouse gases absorb much of it.
What are some of the major forces that influence the movements of the oceans?
What does lemon juice, snake venom and cyanide have in common?
Answer:
enzymes are protein molecules that act as catalysts, speeding up chemical reactions without themselves getting used up. Each enzyme will only speed up a specific reaction, for example, catalase will speed up the decomposition of hydrogen peroxide into water and oxygen but it will not speed up the breakdown of starch into glucose. Enzymes (e.g. catalase) have active sites with specific shapes that bind to the substrate molecule (e.g. hydrogen peroxide) forming an enzyme-substrate complex. The enzyme-substrate complex then breaks down into the enzyme and product, allowing the enzyme to go on and react with another substrate molecule. Temperature and pH affect enzyme function because they can change the shape of the enzyme’s active site, preventing it from binding to the substrate, just as a broken lock will no longer fit the key. When the shape of an enzyme changes we call this denaturation. Any factor that increases the frequency of collisions between enzymes and substrates (increasing concentration, surface area or temperature) will increase the rate of reaction.
Explanation:
What lemon juice, snake venom and cyanide have in common is hat they are all acidic substances.
An acidic solution is a solution that contains hydrogen ions as its only positive ion in solution. Acidic substances have a sour and turn blue litmus paper red.
What lemon juice, snake venom and cyanide have in common is hat they are all acidic substances.
Learn more about acids: https://brainly.com/question/3930479
Which of the following is a result of too many greenhouse gases in the atmosphere?
A: Glaciers melting
B: Sea levels rising
C: Cloud forests drying
Answer:
glaciers melting
Explanation:
thats what i would say
Hurry plzzzz >_<
How are plant and animal cells similar?
Answer:
Plant and animal cells are similar because both are eukaryotic. Every plant and animal cell has a cell membrane and cytoplasm. In addition, nearly all plant and animal cells have a nucleus.
Explanation:
I got it right
Only eukaryotic cells have
cytoplasm
membrane bound organelles
DNA
ribosomes
In the United States, alcoholic beverages that are sold in stores display a government warning stating that pregnant women should not drink alcoholic beverages. This is because
it prevents cleavage division from occurring, so a zygote cannot become a blastocyst.
if a woman drinks alcohol while she is pregnant, she may not be able to ovulate again after childbirth.
studies have proven that alcohol consumption causes long-lasting disorders in the fetus.
the science of chemistry has shown that alcohol is a reactive substance that may interfere with the mother’s food digestion.
Answer:
It should be "studies have proven that alcohol consumption causes long-lasting disorders in the fetus."
Explanation:
because everything the mother eats enters the child's body alchoholcan cause problems as if th e child were aready born and drinking.
Answer:
c
Explanation:
Scientists core a Redwood tree in the California Redwood forest. The core of this particular tree has 1115 rings. How old is the tree in years?
Answer:
1115 years.
Explanation:
One ring equak one cycle year.
Which of the following is NOT a characteristic of all living things?
Ability to reproduce
Ability to move
O Growth and development
Homeostasis
Answer:
homeostatis
Explanation:
The answer should be homeostatis. Organisms can not do this.
Answer:
Ability to move
Explanation:
All organism species have the ability to reproduce, grow and develop, and maintain homeostasis (for example, sweating). Not all organisms can move, however. Cacti, for instance, are stiff and do not move on their own, yet are still alive.
16. Name one organism that reproduces through binary fission
Answer:
Coral!
Explanation:
I learned this is a biology class a while ago!
Answer:
Bacteria
Explanation:
During the light dependent reactions of photosynthesis which is not produced
A.Oxygen
B.ATP
C.NADPH
D. Glucose
*hurryyyyyyy*
Answer:
D. Glucose
Explanation:
HELP PLZZ
Lipids have several functions, which include
A.protection from water loss
B.control chemical reactions
C.help fight disease
D.insulation
Answer:
D . Insulation
Explanation:
Is toxic chemical pollution a nonpoint source pollution or a point source pollution? I need an actual answer.
Answer:
Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. Oil, grease and toxic chemicals from urban runoff and energy production.
Explanation:
Why should we be concerned about the disappearance of phytoplankton in the oceans
Answer:
The loss of phytoplankton is a huge problem for marine food chains, says Worm, because every creature in the ocean either eats phytoplankton or eats other organisms that depend on it.
Hope this helps!
Wetlands are natural parts of watershed systems. Wetlands provide benefits many benefits. Which of these is a way that wetlands directly benefit humans?
- provide nesting grounds for birds
- decrease erosion along shorelines
- reduce flooding in adjacent towns
- increase biodiversity near the ocean
wetlands help us by reducing flooding in adjacent towns
Answer:
the answer is c because it soaks up the water so it cant flood the towns
Explanation:
Can someone answer this!!!!!!
Answer:
Diffusion.
Explanation:
Diffusion is the net movement of anything from a region of higher concentration to a region of lower concentration.
When the [tex]O_{2}[/tex] moves in, the [tex]CO_{2}[/tex] moves out.
Essay on atoms 70 words
Answer:
The atom, the basic building block of matter, consists of a core nucleus surrounded by negatively charged electrons. Inside the atom nucleus contains a mixture of positively charged protons, and electrically neutral neutrons. All atomic electrons bind to the nucleus through electromagnetic force. A ground of electrons bound together will form individual molecules. An atom with an equal number of protons and electrons will hold neutral. An ion has positive or negative charge, either through a lack of electrons or an electron excess. The number of protons determines the formation of chemical elements, while as the number of neutrons determines the element's isotope. Most of the atom's mass has a concentration compacted within its nucleus; however, protons and neutrons hold about the same mass. Electrons bound to atoms hold a percentage of stable energy levels, otherwise known as orbitals, which undergo transitory processes through absorbing or omitting photons with equal energy levels. Electrons determine an element's chemical properties, thus influencing an atom's magnetic properties.
Explanation:
The fraction whose denominator is 8 more than the numarator
Answer:
Explanation:
1/9
Answer:
[tex]\frac{8}{16}[/tex]
Explanation:
Which of the following statements correctly describes the relationship between energy and nutrients in an ecosystem?
a. Energy and nutrients flow
b. Energy and nutrients cycle
c. Energy flows and nutrients cycle
d. Energy cycles and nutrients flow
which two structures are not found in both animal and plant cells
How does mutation increase chances for survival? Please help me.
Answer:
These mutations can increase an organism's chance for survival and usually occur over a course of many generations producing offspring (or babies) with the helpful mutation. ... This would allow you to mate and produce offspring because you would have survived for longer lifespans.
Explanation: