1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sergeeva-Olga [200]
3 years ago
11

Question 1 (2 points)

Biology
1 answer:
ch4aika [34]3 years ago
3 0

Answer:genetic drift

Explanation:

You might be interested in
Which of the following kinds of cells preform basic functions such as obtaining energy from food?
strojnjashka [21]

Plant cells, but not animal cells

Animal cells, but not plant cells

Both plant cells and animal cells

Neither animal cells nor plant cells

Answer:

Both plant cells and animal cells

Explanation:

The process where the energy locked up in food is extracted take place in both plants and animal cells.This process is called Cellular respiration.It is the process of combining inhaled and diffused oxygen in the blood with assimilated food substances (glucose,amino acids,fatty acids and glycerol) to produce energy.

In both cells it takes place in the the cytoplasm and mitochondrial.

It begins with Glycolysis, followed by Krebs's Cycle..These two steps gives certain of ATPs to these cells

.However,the largest amount of ATPs is synthesized during oxidative phosphorylation  for maximum of energy to be produced.This process involved the chemiosmosis where protons were diffused into the intramembranes by the proton pump (PMF) and diffused back into the matrix of the mitochondria to generate the electrochemical gradients.

The electrochemical gradients generate the energy for enzymes ATPase synthase needed for phosphorylation of ADP with Pi to give ATPs.

The oxygen act act the final electron acceptor.

6 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
2 years ago
Which feature is used to classify a rock based on its composition?
sergejj [24]

Answer:

The origin of the rock. The texture of the rock. The type of mineral in the rock.

7 0
3 years ago
Describe the difference between a cladogram and a phylogenetic
Genrish500 [490]

Cladograms are concerned with the way organisms are related to common ancestors through shared characteristics. Phylogenetic trees compare organisms over evolutionary time and the amount of change that has occurred over time to figure out the relationships.

7 0
3 years ago
The crayfish scavenge for dead fish and decayed vegetation at the bottom of the pond. This describes the crayfish's
Rama09 [41]
This describes its habitay
6 0
3 years ago
Read 2 more answers
Other questions:
  • A person shakes up vinegar and oil dressing before pouring it on salads. what is the chemical reason for doing this
    10·1 answer
  • fossils in _____ layers of rock are generally estimated to be _____then fossils found in the deeper layers A. older,younger B. n
    14·2 answers
  • Name the category of causative agents of typhoid​
    8·1 answer
  • Discuss how microbial world is divided providing at least two unique features of each of the living group
    15·1 answer
  • How would you feel being a second-class citizen, denied access to high-level jobs and discriminated against simply because of yo
    10·1 answer
  • How many pairs of chromosomes exist in each of your cells?
    9·1 answer
  • Many countries use DDT to control the spread of deadly __________.
    11·2 answers
  • Which of the following list the levels of organization from least complex to most conplex
    12·1 answer
  • An astronomer oberves a blue shift in the nearby Andromeda galaxy. What
    11·1 answer
  • What type of molecule is doing the "work" in the picture
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!