Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls of the ____
a. epiglottis
b. bronchioles
c. large bronchi
d. trachea
e. aorta
ANSWER: b
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The lock-and-key analogy for enzymes applies to the specificity of enzymes _____
A) as they form their tertiary structure B) as they form their tertiary and quaternary structure C) binding to their substrate D) interacting with water E) interacting with ions
Homologous genes in different species are called
A. analogs. B. paralogs. C. orthologs. D. dialogs. E. monologs.
Why is it believed that life cannot evolve on a planet that orbits a spectral type A, B, or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Mitosis is the process by which
A.) microtubules are assembled B.) cytoplasm is divided C.) the nucleus is divided into two nuclei D.) the cell rests