Because ammonia is very toxic, it is kept at low levels in the body by (select all correct choices):
A. being eliminated.
B. being converted to urea.
C. being stored away from body tissues.
D. being converted to uric acid.
E. being converted to amino acids.
A,B,D
Biology & Microbiology
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Which type of selection would lead to two distinct phenotypes?
A. Stabilizing selection B. Phenotype selection C. Fitness selection D. Disruptive selection E. Directional selection
Biology & Microbiology
Angiosperms first appeared during the ____ period
a. Cambrian b. Jurassic c. Cretaceous d. Neogene e. Devonian
Biology & Microbiology
The plant cell organelle most analogous to the animal cell endosome is the
A) provacuole. B) lysosome. C) peroxisome. D) glyoxysome. E) None of the above are analogous.
Biology & Microbiology
The lac operon is an example of a(n) _______ operon.
a) repressible b) inducible c) noninducible d) constitutive e) irrepressible
Biology & Microbiology