The main force that moves blood throughout the system of blood vessels is ____
a. arterial blood pressure
b. skeletal muscle action
c. smooth muscle action
d. valve action
e. venous blood pressure
ANSWER: a
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Antibody-mediated immune responses produced by specific proteins are generated by:
a. lymphocytes of the T class. b. lymphocytes of the B class. c. neutrophils. d. basophils.
The apparent lack of intermediate forms in the fossil record can be explained by the ____ hypothesis
a. disruptive selection b. fossil decay c. punctuated equilibrium d. genetic drift e. allopatric speciation
The short, numerous appendages used by some bacterial cells for adhering to surfaces are called ________.
A. flagella B. pili C. fimbriae D. cilia E. periplasmic flagella (axial filaments)
Lastly, structures composed entirely of connective tissue and commonly found in joints, are examples o
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