Humans have ____ vertebrae
a. 21
b. 26
c. 23
d. 46
e. 58
ANSWER: c
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Which answer correctly matches a muscle characteristic with the appropriate muscle type?
a. rapid contraction rates, smooth muscle b. transverse striping, smooth muscle c. centrally positioned nucleus, skeletal muscle d. branched cells, cardiac muscle
The primary consumers in natural communities
are a. herbivores. b. carnivores. c. scavengers. d. decomposers. e. all of these
The first known primates were characterized as
a. arboreal and nocturnal. b. ground-dwelling and nocturnal. c. arboreal and diurnal. d. ground-dwelling and diurnal. e. none of these.
Antibody production is an indispensible part of our immune response, but it is not the only defense our bodies have. Which of the following is observed during an infection that is not a result of antibody–antigen interactions?
(a) B cell proliferation (b) aggregation of viral particles (c) systemic temperature increase (d) antibody secretion