Answer:
Telomerase
Explanation:
Repetitive regions at the ends of Chromosomes are known as telomeres and these are crucial for chromosomal stability. There is no gene present and they provide protection to internal parts of chromosome. The telomeres are eaten up slowly by ‘DNA REPAIR MECHANISM’ after many division cycles, which is considered as ageing. That why, a cell can divide only certain number of times.
Some cells have ability to express an enzyme telomerase that maintain the length of telomere. The telomerase enzyme contributes to cell immortality by rebuilding the damaged telomere. Thus telomerase enzyme is necessary for cancer initiation and survival of tumor. Telomerase enzyme can make its own DNA by using its RNA as template
. It extends the overhang strands of DNA by using a comlementary DNA.
Answer:
Adrenocorticotropic Hormone (ACTH)
Explanation:
Answer:
Se llama organismos multicelulares.
Espero que esto sea lo que estás buscando.
A particle with only 9 protons and no electrons would be an ion, because one proton contains a +1 charge and one electron contains a -1 charge while neutrons have no charge. This particle, without electrons would then have an ionic charge of +9.
I think its false because gas exchange can happen in blood also
