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Westkost [7]
3 years ago
10

A cell’s progression through the cell cycle requires the activity of several cyclin-dependent kinases. What are these cdks, how

are they activated, how are they inactivated, when do you see their levels rise and what are their targets?
Biology
1 answer:
notka56 [123]3 years ago
7 0

Answer: 1. Cyclin-dependent kinases.

2. The activation process is in two steps: binding of cyclin to cdk and then phosphorylation of cdk cyclin.

3. They are activated when cdks sends signals to cell that is pass already into the next stage of the cell cycle.

4. They are inactivated by the combination of P21 and Thr-14/Tyr-15 phosphorylation after uv induced DNA damage.

5. Changes are seen in target protein level when cdks level rises.

6. The targets are protein that promotes cell divisions.

Explanation:

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All of the following statements describe kinesin-I EXCEPT__________.
adell [148]

Answer: Option A

Explanation:

Kinesin -1 is the major anterograde motor which helps in the transportation along micro tubules. This is important for the proper transport of the mitochondria, Golgi derived vesicles,  endoplasmic reticulum tubulin, mRNA and intermediate filament sub units.

It moves along the micro tubules and for this task it gets energy from the adenosine triphosphate.

The heavy chain of KInesin 1 is made of globular head via short flexible neck and has a light chain as well which ends in the carboxy terminal.

4 0
3 years ago
What does cell specialization in multicellular organisms aloows cells to do?
weeeeeb [17]

Answer:

Explanation:

Cell specialization is also called cell differentiation. Through this process, specialized cells form from the unspecialized cells. Then many cells are formed and determined to form specialized functions.

The stem cells are the unspecialized cells which form a different kind of specialized cells.  

The muscle cells, nerve cells, sperm cells, red blood cells are specialized cells perform different specialized functions. All these cells arise from stem cells. The nerve cells receive impulse, muscle cells can contract, etc.

There are certain inductive signaling genes that send the signal to the differentiated cells. These signaling molecules are called ligands. These ligands move to another cell to produce specialized cells. In other words, there are some transcription factors and genes responsible for such cell differentiation and the formation of specialized cells.

Another example is zygote, which is an unspecialized cell. This is also a totipotent cell that has the potentiality to reproduce different cells.

6 0
3 years ago
How do humans interfere in the carbon cycle?
stich3 [128]

Answer:

Humans burn fossil fuels, clear trees, change land use, creating smog that traps the carbon in the Earth's atmosphere, leading the oceans to absorb the heat and eventually end up with global warming and ocean acidification.

Explanation:

Good luck <3

4 0
3 years ago
Studies of the molecular genetics of living apes and humans suggests that _____ are most closely related to one another with ___
alexira [117]
Chimpanzees are more closely related while orangutans are the least closely related of the apes. Gorillas are in the middle of the two.
3 0
3 years ago
Cystathioninuria can be caused by two different mutations in the enzyme cystathionase. Cystathioninuria caused by mutation 1 can
polet [3.4K]

Answer:

C. The enzyme with mutation 1 has decreased affinity for pyridoxal phosphate, whereas the enzyme with mutation 2 has lost the ability to bind to the substrates.

Explanation:

A coenzyme is an organic cofactor that binds with an enzyme in order to initiate or aid the function of the enzyme. A coenzyme binds to the active site of the enzyme (where the reaction occurs), thereby triggering its activation by modifying protein structure during the reaction. Some examples of coenzymes include Coenzyme A and Adenosine triphosphate (ATP). Pyridoxal phosphate is a coenzyme (it is the active form of vitamin B6) that is required for the function of cystathionase. Moreover, cystathionase is an enzyme that enables cells the synthesis of cysteine from methionine (transsulfuration pathway). The binding of pyridoxal phosphate to the enzyme increases the binding affinity of the enzyme for the substrate, thereby influencing its activity. In this case, it is expected that mutation 1 reduces the binding affinity of the enzyme to the cofactor, and thereby the cofactor is required at a higher concentration to restore normal enzyme activity.

3 0
3 years ago
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