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Agata [3.3K]
3 years ago
13

What organs function using the photereceptors

Biology
1 answer:
padilas [110]3 years ago
4 0
The Brain, the Pineal Organs (aka your third eye), and your eyes' retinas!
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If an entire stack of rock layers has been folded, which of these would have occurred most recently?
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The top layer will be the most recent
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If a star is small, it will likely last ____ a large star.
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Longer than a larger star
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How will wolf emigration affect a grassland ecosystem that supports rabbits, the wolf's primary prey?
svet-max [94.6K]

Wolf emigration will bring about the rabbit population increasing.

<h3>What is Emigration?</h3>

Emigration is defined as the movement of organisms away from a particular

area or habitat.

We are aware that Wolves feed on rabbits as a means of food in the

grassland ecosystem. This translates to the following below:

  • The greater the wolves the lesser the rabbit
  • The lesser the wolves, the higher the rabbit.

This therefore means that wolf emigration will bring about the rabbit

population increasing which makes option B the most appropriate choice.

Read more about Emigration here brainly.com/question/1289209

6 0
2 years ago
Gene mutations can be passed on to future generations and drive natural selection. Choose the best description of how Gene mutat
prohojiy [21]
Gene mutations can be passed on to future generations and drive natural selection. ... Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction
5 0
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
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