Which molecule is a first messenger but not a second messenger?

a. G protein
b. cyclic AMP
c. acetylcholine
d. protein kinase
e. adenylyl cyclase


c

Biology & Microbiology

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What do the letters D-N-A stand for?

A. Dioxyribonuclear acid B. Deoxyribonucleic acid C. Deoxyrobonuclear acid D. Dioxyribonucleic acid

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How many different classes of neurons are

involved in most nervous systems?

a. 1 b. 2 c. 3 d. 4 e. 5

Biology & Microbiology

Multiple effects of a single gene is

a. expressivity. b. penetrance. c. codominance. d. pleiotropy. e. multiple alleles

Biology & Microbiology

Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. What term describes this relationship?

A) commensalism B) competition C) predation D) parasitism

Biology & Microbiology