Question

Select the correct statements.
A) H1 histone molecules lie inside the core of the molecule and seals the two turns of DNA.
B) The acrocentric chromosome has two long arms.
C) The association between negatively charged DNA and positively charged histones allows for meaningful DNA packaging inside the nucleus.
D) A few chromosomes have non-staining secondary constrictions at a constant location which gives the appearance of a small fragment called the satellite.

• A. A, C
• B. B, C
• C. B, D
• D. C, D

Answer 1

The correct option is D C, D

The histone proteins are positively charged molecules. The DNA is negatively charged due to the presence of the phosphate backbone. The interaction between the DNA molecules and the histone proteins allows forming the structure called the nucleoid. This nucleoid is packed and condensed to form the structure of DNA which can be easily packaged in the nucleus.

There are certain regions on the chromosomes which are known as satellites. These regions are denoted due to constrictions other than the centromere. This is the regions which are not stained and are present at a fixed location. There are many repeated sequences in this region.

Thus, the correct answer is option D.