Question 1 If treatment with the signaling molecule (hormone) vasopressin result

Question

Question 1

If treatment with the signaling molecule (hormone) vasopressin results in an increase of intracellular Ca+2 in its target cells, then:

a.adenylate cyclase activity has increased

b.Na+/K+-ATPase pump activity has increased

c.phospholipase C activity has increased

d.protein kinase C (PKC) activity has decreased

e.protein kinase A (PKA) activity has increased

QUESTION 2

Growth factors induce mitosis in cells. Which of the following events must be triggered by the growth factor-associated signaling pathways?

a.Integrin clustering

b.Microtubule treadmilling

c.Nuclear lamin phosphorylation

d.CREB binding to CRE

e.Transfer of core oligosaccharide to ER proteins

QUESTION 3

PTEN is a

a.G protein coupled receptor

b.tyrosine kinase

c.serine/threonine kinase

d.phosphatase

QUESTION 4

Modification of histones by __________ causes expression of genes.

a.acetylation

b.methylation

c.both acetylation and methylation

d.neither acetylation nor methylation

QUESTION 5

____________ are involved with condensation of chromosomes during prophase, DNA repair and proper alignment of sister chromatids during mitosis.

a.Condensins

b.Cohesins

c.Both condensins and cohesins

d.Neither condensins nor cohesins

QUESTION 6

Which of the following RNA molecules must leave the nucleus before they begin functioning?

a.mRNA

b.tRNA

c.snRNA

d.Answer A and B

e.All RNAs must leave the nucleus to function

Explanation / Answer

1-c, adenylate cyclase is activated by influx of extracellular calcium, PKC activity is increased

2-c Nuclear lamin phosphorylation is followed by all other processes in mitosis

3-d PTEN is tumor suppressor protein which is a a phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase

4-c

5-a, cohesins mediate separation of sister chromatids

6-d snRNA remains in nucleus

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