Answer/Explanation:
Telomeres are structures found at the end of the chromosomes. They are protective structures made of repetitive sequences. They protect chromosomes from damage or fusing with other chromosomes. As the cell divides and divides, telomeres shorten. When they reach a critical point, the cell stops dividing, and might even undergo apoptosis (die).
Telomerase is an enzyme that adds nucleotides to telomeres to prevent their shortening. If all our cells expressed telomerase, the telomeres would never reach the critical short length to stop cell division. Therefore, our cells would keep dividing forever!
Answer:
D. the cavity or passage that receives blood from the atrium and pumped into the body.
Explanation:
Answer:
Calcium
Explanation:
it helps to make the bones strong by maintaining the bone mass necessary for them to function well.