Question

Given below are two statements:
Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome. 
In the light of the above statements, choose the correct answer from the options given below :

• A. Both Statement I and Statement II are false.
• B. Statement I is true but Statement II is false.
• C. Statement I is false but Statement II is true.
• D. Both Statement I and Statement II are true.

Answer 1

The Correct Option is C

To determine the correctness of the given statements about DNA structures in prokaryotes and eukaryotes, it's essential to evaluate each independently:

• Statement I: In prokaryotes, it is stated that positively charged DNA is held with negatively charged proteins in a region called the nucleoid. In reality, the DNA in prokaryotes is negatively charged due to phosphate groups, and it is not associated with histone proteins as in eukaryotes. Instead, it is simply condensed in the nucleoid without the involvement of positively charged proteins. Thus, this statement is incorrect.
• Statement II: This statement is about eukaryotic DNA being wrapped around positively charged histone proteins to form a nucleosome. This is accurate; eukaryotic DNA, which is negatively charged, indeed wraps around histones forming a nucleosome structure. Therefore, this statement is correct.

Given the analysis above, the appropriate choice is:

Statement I is false but Statement II is true.