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nadya68 [22]
3 years ago
7

How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same. In other w

ords, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?
Biology
1 answer:
serg [7]3 years ago
8 0

This occurs through the process of cell specialization, where in some cells genes are active whereas in others they are not.

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using the gas pedal analogy explain the impact on the cell cycle of a proto-oncogene versus an oncogene
rusak2 [61]

Using the gas pedal analogy, the proto-oncogene would be an accelerator since they promote cell division and deregulate apoptosis, while tumor suppressor would be the brakes since they constrain the progress of the cell cycle and induce cell apoptosis. An oncogene is, therefore, when the accelerator is stuck in down position and the brakes are not working.






3 0
3 years ago
What carries electrical messages from the brain to the heart
Svetach [21]
The spinal cord and the brain make up the central nervous system, and spinal cord nerves carry most messages between the brain and the rest of the body.

The vagus nerve carries the signal from the brain to the heart.
7 0
3 years ago
You have discovered a cell type in humans that has an unknown function. The cells are found in the epithelium of the lungs. It a
schepotkina [342]

Answer:

The correct option is a) "decrease the amount of GTP to inhibit microtubule elongation and block secretion"

Explanation:

Since microtubules play a critical role in transporting secretory vesicles, preventing it from elongating will keep it from performing this function. Completely eliminating the microtubules from the cell as suggested in option d will harm the cells and other processes in it because the microtubules also have an integral part to play in maintaining cell shape & structure.

Hope that answers the question, have a great day!

4 0
3 years ago
Which of the following is not a good polling technique? A. asking clear questions B. using a push poll C. using a large sample D
svetlana [45]
Question is which is NOT a good technique.
Answer is "B" and here's why:

A) Clear questions -- good. People understanding the question will answer accurately.
C) Large sample size -- good. Answers will be more accurate with more people asked (like if you flip a coin 1,000 times its going to be closer to 50% heads than if you only flipped it twice)
D) Random sample -- good. Avoids your own bias in choosing who to ask.

B) Push poll -- bad. Pretends to be unbiased, the pollster's real objective is to get a person thinking in a way that is to their advantage. Some political candidates do this just before elections.
3 0
3 years ago
Choose the accurate statements about how communication by the nervous and endocrine systems differs. Check all that apply. Check
andreev551 [17]

Answer:

The nervous system releases neurotransmitters at synapses at specific target cells & The endocrine system reacts more slowly to stimuli, often taking seconds to days.

Explanation:

The nervous system is very specific with where the neurotransmitters go so they will affect target cells. The endocrine system is slower than the nervous system because the hormones travel through the blood so it takes much longer to reach the designated area.

6 0
3 years ago
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