Question

question 4 of 25
what is one function of noncoding dna?
a. to connect the two strands of dna in the double helix
b. to determine the sequences of amino acids in proteins
c. to keep dna strands from being too long to fit inside a cell
d. to protect regions of coding dna from damage

Explanation:

Non - coding DNA includes telomeres. Telomeres are repetitive sequences at the ends of chromosomes. They act as protective caps. As cells divide, the ends of chromosomes (where coding DNA is located) can get damaged. Telomeres (a type of non - coding DNA) are gradually shortened instead of the coding regions, thus protecting the coding DNA from damage.

• Option A: Hydrogen bonds connect the two strands of DNA in the double helix, not non - coding DNA.
• Option B: Coding DNA (genes) determines the sequences of amino acids in proteins, not non - coding DNA.
• Option C: DNA is packaged with proteins (histones) to fit inside a cell, not because of a length - related function of non - coding DNA in the way described.

Answer:

D. To protect regions of coding DNA from damage