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KonstantinChe [14]
2 years ago
10

What happens to water that does not percolate?

Biology
2 answers:
svetoff [14.1K]2 years ago
7 0
A. It becomes a runoff
inysia [295]2 years ago
3 0
The answer is a it becomes a run off

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Match the following respiratory conditions to the
dimaraw [331]

Answer:

Emphysema ;A condition often caused by smoking,

Bronchitis ;     The inflammation of bronchioles in the lungs

Asthma ; A condition in which an attack can trigger

Pneumonia ; The build up of fluid in the alveoli of the lungs

Explanation:

I hope it helps :)

8 0
3 years ago
Why is greater food production important to the world's population?
attashe74 [19]
Humans require food to continue to function, we overeat, and undereat. The more food we have the better we wil live
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3 years ago
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Thermal pollution affects only fish. Please select the best answer from the choices provided T F
notsponge [240]
False it affects everyone and anything. Global warming for example my friend :/
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3 years ago
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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
Question 1 Which term is defined as "the basic unit of structure and function found in all living things"? tissue organ organell
just olya [345]

I’m pretty sure it’s a cell

6 0
3 years ago
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