Which is true of the nucleotide base composition within the DNA double helix?
A. G=A
B. T=C
C. T+A=C+G
D. T+G=A+C
E. A=U
D. T+G=A+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
The evidence that one species of finch migrated to a Galàpagos island, and evolved into two species now found on the same island, feeding on different food sources, is an example of speciation.
A. postzygotic B. prezygotic C. parapatric D. allopatric E. sympatric
Second messengers are molecules of
a. steroid compounds. b. cyclic AMP. c. ADP. d. prostaglandin. e. intermedin.
Compare and contrast the structure of an herbaceous eudicot stem and that of a monocot. What will be an ideal response?