Which of the following is not an assumption of the Hardy-Weinberg principle?
a. no mutation
b. no migration
c. small population size
d. random mating
e. no selection
C
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In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
RNA polymerase binds to ________ before beginning transcription.
A) a promoter B) an operator C) a structural gene D) a replication origin E) the Shine-Dalgarno
Explain why mutualism is sometimes viewed as ‘reciprocal exploitation’. What will be an ideal response?
The term motor unit refers to
A) all the muscle fibers that synapse with one motor neuron. B) all sarcomeres within a single muscle fiber. C) an entire skeletal muscle. D) all the skeletal muscles in one region of the body. E) all the motor neurons stimulating a skeletal muscle.