1) Which of the following events occurs following the binding of a ligand to a G

ID: 8963 • Letter: 1

Question

1) Which of the following events occurs following the binding of a ligand to a G protein-coupled receptor that triggers release of Ca2+?

a) activation of protein kinase A by IP3

b) phospholipase cleavage of PIP2 to IP3 and DAG

c) release of DAG into the cytosol

d) IP3-mediated opening of Calcium channels in the ER membrane

2) Which statement best explains the way that an abnormal p53 causes normal cells to become cancer cells?

a) The abnormal p53 protein fails to carry out DNA repair.

b) The abnormal p53 protein triggers too many cells to grow.

c) The abnormal p53 protein damages the normal DNA.

d) The abnormal p53 protein stimulates the death of normal cells.

e) The abnormal p53 protein enhances tumor-suppressor genes.

3-On which of the sex chromosomes is a sex-linked gene usually carried?
1. 13
2. 15
3. 18
4. Y
5. X

Question #1. is b) phospholipase cleavage of PIP2 to IP3 and DAG Question #3. is 4. Y

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