The ____ in humans is active in both the digestion of food and the absorption of nutrients
a. mouth
b. liver
c. pancreas
d. small intestine
e. stomach
ANSWER: d
Biology & Microbiology
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Bicarbonate ions in the blood can absorb hydrogen ions, keeping pH balanced. Bicarbonate is acting as a ____ in blood
A. acid B. alkaline C. buffer D. base
Biology & Microbiology
Most microbes that inhabit estuaries are ________.
A. halovariable B. halophobic C. halophilic D. halotolerant
Biology & Microbiology
Amino acids are linked by what kind of bonds
to form the primary structure of a protein? a. disulfide b. hydrogen c. ionic d. peptide e. none of these
Biology & Microbiology
The human immunodeficiency virus mounts a direct attack on TH cells by recognizing the ________ proteins in the plasma membrane of these cells.
A. CD4 B. cytokine receptor C. CD8 D. major histocompatibility class I E. Toll-like receptor
Biology & Microbiology