Question

Which of the following is a characteristic of DNA sequences at the telomeres?

a. One strand consists of guanine and adenine or thymine nucleotides
b. They consist of repeated sequences
c. one strand protrudes beyond the other, creating some single-stranded DNA at the end
d. All of the above

Answer 1

DNA sequences at the telomeres consist of repeated sequences, have a 3' overhang of single-stranded DNA, and involve the enzyme telomerase to maintain chromosome integrity; thus the correct answer is d. All of the above.

Step-by-step explanation:

The characteristic of DNA sequences at the telomeres is d. All of the above. Telomeres are repetitive nucleotide sequences at the ends of linear chromosomes that protect the coding DNA sequences from degradation during cell division. In humans, the telomeric sequence is TTAGGG repeated hundreds to thousands of times.

Additionally, telomeric DNA includes a 3' overhang, where one strand protrudes beyond the other, leaving some single-stranded DNA at the end. This overhang is important for the enzyme telomerase to attach and extend the telomeres, ensuring the chromosomes are fully replicated without the loss of vital genetic information.