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.
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The failure to develop tolerance may result in dangerous reactions to self-antigens, a condition called
A) type I hypersensitivity. B) immunotolerance. C) autoimmunity. D) immunodeficiency.
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.
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
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.