Electrons lost by chlorophyll are replaced by electrons donated from:
a. NADPH
b. sunlight
c. water
d. carbon dioxide
e. ATP
c
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A toxin that binds specifically to voltage-gated sodium channels in axons would be expected to _____
A) prevent the hyperpolarization phase of the action potential B) prevent the depolarization phase of the action potential C) prevent graded potentials D) increase the release of neurotransmitter molecules E) have most of its effects on the dendritic region of a neuron
The structure that aids in locomotion of some bacteria is a(an):
a. Pilus b. Flagellum and Cilium c. Flagellum d. Cilium e. Flagellum and Pilus
The activation of proteinase inhibitor genes occurs
A. before the systemin moves through the phloem of the plant. B. in the cytoplasm of the affected cells. C. in the nucleus of the affected cells. D. in anticipation of a physical wound to the plant. E. on the plasma membrane of the affected cells.
In a population, a polymorphic locus has
a. only one allele. b. no alleles resulting in a mutant phenotype. c. only alleles that cannot be phenotypically distinguished. d. two or more alleles that may or may not have a phenotypic effect. e. two or more alleles that each result in a different mutant phenotype.