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Westkost [7]
2 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]2 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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In Activity A, you explored photosynthesis in a pond. The dissolved oxygen in a pond is
Anon25 [30]

Answer:

Photons

Explanation:

Photons are the only source of energy for photosynthesis. Photons are absorbed by chlorophyll molecules within Photosystems I and II (and antennae complexes), generating higher-energy ‘excited’ states of the photosystems which can carry out energetically costly chemical reactions.

5 0
3 years ago
Read 2 more answers
In the coniferous forests of Oregon, eight species of woodpeckers coexist. Four species select their nesting sites based on tree
dem82 [27]

Answer:

The correct answer is a. resource partitioning

Explanation:

Resource partitioning is a strategy that species employ to avoid competition. It is based on the selection of different nutrition sources by different organisms that coexist in the same ecological niche, so there is no conflict between them. In the present case, each one of the eight species of woodpeckers feed on different trees, it means that each one select a different tree´s species or, if they select the same species, they use trees of different diameters.

6 0
3 years ago
2. Nitrogen, as it is found in the ATMOSPHERE, can be used by plants and
irina1246 [14]

Answer:

false

Explanation:

Although the majority of the air we breathe is N2, most of the nitrogen in the atmosphere is unavailable for use by organisms. This is because the strong triple bond between the N atoms in N2 molecules makes it relatively unreactive. However organisms need reactive nitrogen to be able to incorporate it into cells.

8 0
3 years ago
Which of the following is homozygous dominant? a AA b Aa c aa
GarryVolchara [31]

Answer: a). AA

Explanation: Every trait is controlled by at least a pair of gene. Genes have different forms known as alleles. Alleles can be dominant or recessive. A dominant allele expresses itself in the presence of a recessive allele and masks the effect of a recessive allele. A recessive allele cannot express itself in the presence of a dominant allele and it's effect is masked by a dominant allele. Dominant alleles are usually written in upper cases such as A, T, while recessive alleles are usually written in lower cases such as a, t. The two alleles that determines a trait is called a genotype. A genotype can be homozygous if the two alleles are identical such as in AA or aa

and can be heterozygous if the two alleles are not identical such as in Aa, Tt.

6 0
3 years ago
Silver is a solid and water is a liquid at room temperature. How do the particles of solid silver compare to the particles of li
Black_prince [1.1K]

Answer:

the particles of solid silver at room temperature are closer together and are colliding with each other more often therefore making it a solid. the particles of liquid water at room temperature are further apart and don't collide as often and have more room to move.

6 0
2 years ago
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