The function of adenylyl cyclase is to:

A. catalyze the conversion of ATP to cAMP.
B. cleave PIP2

into DAG and IP3.
C. directly activate protein kinase A (PKA).
D. stimulate the release of calcium from the endoplasmic reticulum.


A. catalyze the conversion of ATP to cAMP.

Biology & Microbiology

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The failure to develop tolerance may result in dangerous reactions to self-antigens, a condition called

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A single chromosome has

A. multiple genes, each with a single allele. B. a single gene with multiple alleles. C. multiple genes, each with multiple alleles. D. a single gene with a single allele. E. All of the answer choices are correct.

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Which of these melanomas displays rapid and invasive growth, and can be fatal if not removed at an early stage of development?

1.1 only 2.2 only 3.3 only 4.both 2 and 3 5.all of the choices

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The process that decreases the number of organisms with phenotypes less fit to meet environmental

challenges is: a. natural selection. b. genetic drift. c. gene flow. d. genetic polymorphism. e. migration.

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