An interaction in which one species benefits
and the second species is neither harmed nor
benefited is
a. mutualism.
b. parasitism.
c. commensalism.
d. competition.
e. predation
C
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Cells that can break down bone matrix by secreting enzymes and acids are called ________
a. osteocytes b. osteoclasts c. marrow d. osteoblasts
How are polypeptide chains in antigens bound together?
a. Polypeptide chains form hydrogen bonds. b. Serine amino acids form molecular bonds. c. Cysteine amino acids form molecular bonds. d. Polypeptide chains do not bind in antigens.
When a neuron is at rest, _____
a. it is at threshold potential b. gated sodium channels are open c. it holds less sodium than the interstitial fluid d. both it is at threshold potential and it holds less sodium than the interstitial fluid
The concentration of protein in the blood is higher in post-glomerular blood than in arterial blood because
A. water concentration increases and protein concentrations decrease. B. protein is digested and then concentrated in glomerular (Bowman's) capsule. C. reabsorption of protein occurs. D. water passes into the capsule, but protein molecules are too large to move into the capsule and are concentrated in the blood. E. the kidney manufactures and then stores protein in the glomerulus.