Biochemistry Practice Test 5

1. Which out of the following statements is true about gene regulation in bacteria?

Genes with related functions are often grouped together and have a single start codon

Repressor protein blocks transcription by binding to operator sequence

Activator proteins bind near promoters and increase the efficiency of transcription

Enhancers commonly regulate transcription

2. Which of the following could be coded by a tumor-supressor gene?

A protein that helps prevent progression through cell cycle

A protein that codes for a DNA repair enzyme

A protein that helps prevent apoptosis

A protein that forms part of a growth factor signaling pathway

3. Migration of cancerous cells from the site of origin to other part of the body forming secondary tumors is called ___________

Diapedesis

Metastasis

Apoptosis

Proliferation

4. cGMP-dependent protein kinase is also called ____________

Protein kinase G

Protein kinase C

Protein kinase B

Protein kinase A

5. Programmed cell death is termed as ___________

Metastasis

Proliferation

Apoptosis

Mitotic termination

6. Activation of guanylyl cyclase produces ____________

Guanosine 4’, 5’-cyclic monophosphate

Guanosine 1’, 5’-cyclic monophosphate

Guanosine 3’, 5’-cyclic monophosphate

Guanosine 2’, 5’-cyclic monophosphate

7. Which of the following serves as a neurotransmitter in adrenergic neurons?

Histamine

Dopamine

Serotonin

Epinephrine

8. Which of the following statements regarding cyclins is not correct?

They are activated and degraded during cell cycle

They contain a specific amino acid sequence that target them for proteolysis

They catalyze the phosphorylation of protein

They can become linked to ubiquitin

9. Regulatory outcome results from integrated input from both receptors is in _____________

Specificity

Amplification

Adaptation

Integration

10. Which of the following statements is false about a ligand-gated ion channel receptor?

Differences in membrane potential affect whether the channel receptors are open or close

They are present in the cell membrane

Neurotransmitters can act as the chemical messengers for these channels

They consist of five glycoproteins