Final answer:
Telomere sequences are indeed rich in A's and T's, with a specific repeating sequence of TTAGGG in humans. These sequences are critical in protecting chromosomes during cell division and are maintained by the enzyme telomerase.
Step-by-step explanation:
The statement that telomere sequences are rich in A's and T's is True. Telomeres, which are the protective caps at the ends of linear chromosomes, have a specific sequence in humans that is highly rich in thymine (T) and adenine (A) bases.
This sequence is TTAGGG and it repeats numerous times, ranging from 100 to 1000 repetitions. This structure helps to protect the chromosome from degradation during cell division.
The enzyme telomerase also plays a critical role in maintaining telomere length and thus chromosome integrity, particularly in stem cells and cancer cells, by adding these repeating sequences to the ends of chromosomes.