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Helen [10]
2 years ago
10

Which one is not a lip

Biology
1 answer:
Feliz [49]2 years ago
4 0
Where is the picture at
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Explain how cells specialize to form specific tissue and organs?
S_A_V [24]
<span>All cells have the same DNA. They are different because different genes have been locked up and only some of them are expressed. The process began in the embryonic stage, when stem cells are turned into different types of cells by turning off some of the genes. Scientists have been looking for ways to reverse the process, meaning turning specialized cells back into stem cells. Some success has been reported using different methods. The latest one uses a weak acid to stress the cells.</span>
5 0
3 years ago
The interaction between DNA and histone proteins (forming nucleosomes) plays a key role in the regulation of gene expression in
ladessa [460]

Answer:

A. The chromatin near cis-regulatory sequences will be more closed and there will be less transcription.

Explanation:

In the presence of histones, the cis-regulatory sequences of DNA like promoter, enhancers etc. are not exposed. The function of the histone acetyltransferases (HATS) is to cause chromosome decondensation i.e. removal of histones from the DNA so that transcription of the DNA could occur. Histone acetyltransferases (HATS) cause acetylation of lysine amino acid of the histone proteins. Acetyl group is negatively charged so the acetylation of histone proteins leads to the removal of their positive charge which ultimately leads to the decrease in the interaction between N terminal of histones and negatively charged phosphate group of the DNA molecule. As soon as histones are removed from the DNA where cis-regulatory sequences are located, the DNA becomes accessible for transcription.

But here a drug has been added which blocks the activity of histone acetyltransferases (HATS) in cancer cells. So it is quite evident that in these cells, histones will not get removed from the cis-regulatory sequences of DNA so the DNA will be more closer or tightly packed as a result of which  less transcription will occur.

7 0
3 years ago
1. In 1889, August Weismann, a German biologist, conducted an experiment attempting to produce mice
-Dominant- [34]

Answer: inheritance of acquired traits

Explanation: I took the test and aced it so I hope this helped!!

3 0
3 years ago
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i need friends and I need a question answered and i give brainliest too what 3 characteristics of a mammal
Anon25 [30]

Answer:

There are many characteristics of a mammal their hair and furs, young are fed by milk, and sweat glanced.

7 0
3 years ago
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Which of the following is true of the blood-brain barrier? a. The barrier is formed by cells that line the capillaries of the br
grin007 [14]

Answer:

The barrier functions to regulate the chemical composition of the extracellular fluid surrounding the brain cells.

Explanation:

Blood-brain barrier

It is a very selective semipermeable membrane , hence allow some specific substance to pass via it . This barrier separates the  extracellular fluid in the central nervous system  and the circulating blood from the brain .

<u>The barrier is composed of the endothelial cells .</u>

Passive diffusion is shown in this system , and allows molecules like the water , glucose , amino acid to pass .

It regulates the chemical composition of the fluid of brain cell .

6 0
3 years ago
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