In the natural population of black widowbirds, there is some variation in tail length. Tail
length is an inherited trait; the versions of this trait that result in different lengths are called
__________.
a. genomes
b. adaptations
c. phenotypes
d. alleles
D
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The skin of sharks is covered with scales called:
a. placoid. b. cycloid. c. ctenoid. d. ganoid. e. circular.
The large number of alveoli in lungs improve gas exchange by _____.
A. increasing the concentration difference B. changing the diffusion constant C. decreasing the distance for diffusion D. increasing the surface area for diffusion
Which of the following interferes with the reuptake of neurotransmitters?
A) Valium® B) Librium® C) Botox® D) Prozac® E) curare
When sodium ions move from one cardiac muscle cell to an adjacent cell, causing them to contract in unison, this is an example of
A. endocrine signaling. B. paracrine signaling. C. contact-dependent signaling. D. direct intercellular signaling. E. autocrine signaling.