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3 years ago

2. Explain the movement of initial energy from the sun through an energy pyramid.

1 answer:

Ber [7]3 years ago

3 0

So the sun gives energy to the producers (plants) and then the primary consumers eat the producers getting their energy from the plants. Then, the secondary consumers eat the primary consumers getting their energy from the primary consumers and finally the tertiary consumers eat the secondary consumers getting their energy from them. Therefore, the entire energy pyramid starts with the sun!

Hope this helped!

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Complex chemistry is most related to

mars1129 [50]

A complex chemistry is most related to maintaining a stable internal environment.

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3 years ago

Why do the various elements important to life on earth? And how does chemistry relate to life?

Savatey [412]

Chemical elements are important to living organisms because they make up the organic molecules that are found in all living things

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3 years ago

The retinoblastoma protein, pRB, is a tumor-suppressor protein that controls the G1/S cell-cycle checkpoint. While pRB is presen

gladu [14]

Answer:

1. pRB phosphorylated: The cell will not remain in G1 phase i.e. it will enter S phase because pRB will be degraded.

2. pRB not phosphorylated: The cell will remain in G1 phase i.e. will not enter S phase because pRB will remain bound to E2F.

3. pRB bound to E2F: The cell will remain in G1 phase i.e. will not enter S phase.

4. pRB not bound to E2F: The cell will not remain in G1 phase i.e. it will enter S phase.

5. E2F bound to DNA: The cell will not remain in G1 phase i.e. it will enter S phase.

6. CDK4 bound to Cyclin D1: The cell will not remain in G1 phase i.e. it will enter S phase.

Explanation:

Retinoblastoma protein, pRB supresses tumor by regulating cell cycle progression in G1 phase. When a transcription factor known as E2F is bound to pRB the cell remains in G1 phase and did not proceed further to enter S phase. But as soon as pRB becomes phosphorylated, E2F becomes free and causes gene expression of cyclin E and and cyclin A which are required in progression of cell cycle from G1 phase to S phase.

<u>Signaling involved in cell cycle progression from G1 phase to S phase. </u>

When a cell is unstimulated, pRB is bound to E2F but G1 phase specific growth factors induce the expression of cyclin D through Ras-MAP kinase pathway.

Synthesis of cyclin D leads to the activation of CDK-4 which is a serine-threonine kinase. This kinase causes phosphorylation of pRB which results in the degradation of pRB.

Because of degradation of pRB, <u>E2F becomes free</u> and leads to the expression of cyclin E and and cyclin A which are S phase specific cyclins. This is how cell progresses from G1 phase to S phase.

E2F is a transcription factor which causes expression of S phase specific cyclins i.e. cyclin E and and cyclin A. So, E2F bound to DNA will result in cell cycle progression from G1 phase to S phase.

7 0

3 years ago

^^^biology question

nevsk [136]

Answer:

A 40 percent

Explanation:

If guanine is 10 percent this means that cytosine will also be 10.thats a total of 20 percent. We will then have 80 percent remaining for thymine and adenine. As we know adenine make a bond with thymine so 80 divide by 2 is 40 percent for each

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3 years ago

Which of the following takes the genetic code to the cytoplasm

Brut [27]

Answer:

RNA

Before protein synthesis, a messenger carries the genetic code from the DNA in the nucleus into the cytoplasm. The messenger is called RNA.

Explanation:

I dont have biology but i learned about this.

6 0

3 years ago

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