Which one of the following statements regarding histone proteins is correct?

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Q: (CDS-I/2019)
Which one of the following statements regarding histone proteins is correct?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,21,17,9,21,7,1

keywords: 

{'histone proteins': [0, 0, 0, 1], 'histones': [0, 0, 0, 1], 'proteins': [1, 1, 0, 0], 'mitochondrial membrane': [0, 0, 0, 1], 'nucleus': [1, 0, 1, 0], 'dna': [3, 1, 1, 2]}

Option 1: Histones are proteins that are present in mitochondrial membrane.

This statement is incorrect. Histones are not present in the mitochondrial membrane. Histones are primarily found in the nucleus and are associated with DNA.

Option 2: Histones are proteins that are present in the nucleus in association with DNA.

This statement is correct. Histones are a group of proteins that form the core structure of nucleosomes, which are the basic units of DNA packaging in eukaryotic cells. Histones are mainly found in the nucleus and bind to the DNA, helping to compact and organize it into a structure known as chromatin.

Option 3: Histones are proteins associated with lipids in the cytosol.

This statement is incorrect. Histones are not associated with lipids in the cytosol. They are primarily localized in the nucleus and interact with DNA.

Option 4: Histones are proteins associated with carbohydrates in the cytosol.

This statement is incorrect. Histones are not associated with carbohydrates in the cytosol. Their main association is with DNA in the nucleus.

In summary, the correct statement regarding histone proteins is that they are present in the nucleus in association with DNA.