Within the adenylate cyclase signal transduction pathways of target cells, cAMP activates
A. transcription of a mRNA.
B. the receptor.
C. adenylate cyclase.
D. protein kinase.
E. the G protein.
Answer: D
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Why is the nucleus considered to be the control center of cellular activity?
A. It contains DNA. B. It has nuclear pores. C. It contains ribosomes. D. It has a nuclear envelope. E. It has a nucleolus.
This type of protein is involved with shortening of muscle cells to produce movement
a) contractile b) structural c) regulatory d) catalytic e) transport
The sinoatrial node is located _______
A) in the right atrial wall of the human heart B) in the interventricular septum of the human heart C) outside the human heart D) in the left atrial wall of the human heart
Epinephrine is controlled by neural stimuli since it is released from the adrenal medulla in response to signals from the nervous system.
a. true b. false