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NemiM [27]
3 years ago
15

The instantaneous and automatic fear response we experience when unexpectedly stumbling upon a snake illustrates the importance

of the
a. hippocampus.
b. pituitary gland.
c. hypothalamus.
d. amygdala.
Biology
1 answer:
max2010maxim [7]3 years ago
3 0
Option d is right ans.
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Answer:

Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other cell structures. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus, and many other organelles.

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The interaction between DNA and histone proteins (forming nucleosomes) plays a key role in the regulation of gene expression in
ladessa [460]

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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
Which of the following can be used as lamp oil?
djyliett [7]

Answer;

-The most appropriate answer is Lipids

Explanation;

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-They take two forms, namely; fats and oils. Therefore, the oil form of lipid may be used as lamp oil.



8 0
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True or false t and b cells are two tyoes of red blood cells
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the answer is true not false i think

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