Which phylum harbors the MOST functional diversity observed and also has the MOST cultured representatives?
A) Actinobacteria
B) Bacteroidetes
C) Firmicutes
D) Proteobacteria
Answer: D
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The microscopic air sacs or alveoli are the sites where blood
(a) picks up oxygen. (b) gives up carbon dioxide. (c) gives up oxygen. (d) both a and b.
The period following an action potential during which a neuron cannot be stimulated to generate another action potential is referred to as
A. the refractory period. B. the threshold period. C. the resting period. D. the inactivation period. E. the critical period.
Sickle cell disease patients have a ___________ mutation, which is a change from glutamic acid to valine, in their hemoglobin genes.
Fill in the blank(s) with the appropriate word(s).
Antigen receptors on B lymphocytes (antibodies) consist of
A) Two identical light chain and two dissimilar heavy chains. B) One heavy chain and a pair of dissimilar light chains. C) One heavy chain and a pair of identical light chains. D) Two identical light chains and two identical heavy chains.