________ is considered the first messenger, while ________ is called the second messenger.

A. Peptide hormone; cAMP
B. Insulin; glucagon
C. ACTH; cortisol
D. TSH; thyroxin
E. Glucose; insulin


Answer: A

Biology & Microbiology

You might also like to view...

The type of muscle tissue surrounding the intestines and blood vessels is _____

A) skeletal muscle B) cardiac muscle C) striated muscle D) intercalated cells E) smooth muscle

Biology & Microbiology

An enzyme that cleaves internal phosphodiester bonds of a DNA molecule is a (n)

A. ligase. B. exonuclease. C. methylase. D. endonuclease.

Biology & Microbiology

The ultimate source of energy trapped during photosynthesis is

a. CO2. b. H2O. c. O2. d. sunlight.

Biology & Microbiology

The two major factors that contribute to the weathering of rock are climate and:a

inorganic minerals. b. atmospheric carbon dioxide. c. organisms. d. aeration. e. atmospheric oxygen..

Biology & Microbiology