Sharks differ from most other fishes in that
they lack
a. lungs.
b. scales.
c. bones.
d. paired appendages.
e. jaws.
C
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Which of the following does NOT have an effect on the amount of muscle tension that results from a muscle contraction?
a. the size of the motor units in the muscle b. how frequently the motor units are stimulated c. the type of bone to which the muscle is attached d. the number of motor units active at one time
What are genes that code for negative cell cycle regulatory proteins called?
a. oncogenes b. tumor suppressor genes c. proto-oncogenes d. mutated genes
The effect of red light on phytochrome is
indicated by a. A. b. B. c. C. d. D. e. none of these
Someone who inconspicuously harbors a pathogen and spreads it to others is a ________.
A. reservoir B. carrier C. fomite D. source E. vector