Which of the following BEST defines a stimulus?
a. an action potential in a neuron
b. depolarization of a nerve cell
c. energy that activates receptor endings of a sensory neuron
d. the recording of an event in the brain
e. response to a environmental event
C
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What feature of genetic mutations can eventually lead to the evolution of new species?
A. Mutations always produce harmful effects. B. Mutations never affect protein structure or function. C. Mutations are not a mechanism through which biological evolution occurs. D. Mutations always produce beneficial effects. E. Mutations produce changes in the DNA sequence of a gene.
The sequence of nitrogen-containing bases on one strand of DNA most directly determines the sequence of
A) sugars in a polysaccharide molecule. B) amino acids in a protein molecule. C) fatty acids in a fat molecule. D) bases in a protein molecule.
Prairie is another name for a
A. taiga. B. savanna. C. tundra. D. desert. E. temperate grassland.
Work by Charles Darwin and Francis Darwin was instrumental in the discovery of ____
a. auxins b. brassinosteroids c. jasmonates d. cytokinins e. gibberellins