Which muscle type is found in the walls of body tubes and cavities of vertebrates, such as blood vessels and the
intestines?
a. cardiac
b. smooth
c. skeletal
d. rough
e. epithelial
ANSWER: b
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“Prebiotic soup” refers to ____
a. the interior contents of protocells b. the cytoplasm of early prokaryotic cells c. the mix of gases in the atmosphere that gave rise to the first organic molecules d. the polymerized slime coating ancient clay particles e. the accumulation of organic molecules that formed in the oceans before there was life on Earth
If all the offspring of two red glyptodonts are also red, what are the possible genotypes of the parents?
a. Both parents are Aa. b. One parent is Aa, the other is AA. c. Both parents are AA. d. All of these may be true; the offspring must be test-crossed before we can becertain.
There are how many different types of amino acids?
a. 5 b. 10 c. 15 d. 20 e. 50
The two distinct types of neurotransmitter receptors found in postsynaptic membranes are
A. neurotropic and isotopic. B. metabotropic and ionotropic. C. ionotropic and gonadotropic. D. metabotropic and neurotropic. E. gonadotropic and neurotropic.