Consider this pathway: epinephrine ? G protein-coupled receptor ? G protein ? adenylyl cyclase ? cAMP. The second messenger in this pathway is _____
A) cAMP
B) G protein
C) GTP
D) adenylyl cyclase
E) G protein-coupled receptor
Answer: A
Biology & Microbiology
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A. frameshift B. point C. silent D. back
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In which part of a chloroplast does
photosynthesis occur?
a. the stroma b. the outermost membrane c. the innermost membrane d. the DNA e. the ribosomes
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Congestive heart failure occurs when the heart becomes less efficient at pumping blood and blood backs up in the veins and capillaries.
a. true b. false
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The primary RNA transcript in eukaryotes is
A. mRNA before the exons have been removed. B. tRNA before it forms its hairpin loops. C. mRNA after the introns have been removed. D. rRNA before it forms the ribosome. E. mRNA before the introns have been removed.
Biology & Microbiology