If a drug binds irreversibly to a postsynaptic receptor to prevent the binding of an excitatory neurotransmitter, what is
the most likely result?
a. an increased number of IPSPs
b. an increased number of EPSPs
c. a prolonged hyperpolarization
d. a decreased number of IPSPs
e. a decreased number of EPSPs
ANSWER: e
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The zygote is indicated by
a. A. b. B. c. C. d. D. e. E.
The diploid number of chromosomes found in a eukaryotic cell
a. indicates the phylogenetic position of the organism. b. is constant during the life cycle. c. is haploid among asexually reproducers and diploid if they reproduce sexually. d. is cut in half by meiosis and is restored by fertilization. e. is dependent on the age of the tissue.
Carrier molecules in the plasma membrane are required only for active transport
Indicate whether the statement is true or false
The electrons excited by sunlight in photosystem I are replaced by ________, and the electrons excited by sunlight in photosystem II are replaced by ________
A) electrons from water; electrons from water B) electrons from water; electrons from photosystem I C) electrons from water; electrons from carbon dioxide D) electrons from photosystem II; electrons from water E) electrons from carbon dioxide; electrons from water