Answer:
(D) The protein that is first made gets modified afterwards
Explanation:
The first amino acid in any protein in eukaryotes is always methionine (Met). But, in some proteins any amino acid other than methionine may be found at N terminus of a protein. Like in this example, the HBB protein starts with a valine (Val) instead of methionine. It happened because of post-translational modification which includes the action of aminopeptidases which cleave 1 or 2 amino acids from N terminus of a protein as a result of which any amino acid other than methionine may exist at amino terminus.
Answer:
Inappropriate activation of telomerase can result in cellular immortality, one of the cellular changes implicated in the development of cancer.
Explanation:
Some studies show that when telomerase activity is stimulated and a tumor suppressor gene (the p16INK4a gene) is inactivated, cellular immortalization occurs, which constitutes an important step towards the formation of a tumor.
