Which of the following is the chemical substance that allows the transmission of an impulse from a sensory neuron across a synapse to another neuron?
A. receptor
B. hormone
C. sodium
D. neurotransmitter
D
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What would result for global climate from a massive drop in atmospheric carbon dioxide?
A. An increase in ocean temperature B. Increased rock weathering C. A decrease in surface temperature D. Increased nitrogen availability E. A decrease in free oxygen content
Plant success on the terrestrial landscape is linked to the evolution of all of the following except
A. specialized roots. B. stems. C. specialized reproductive features. D. increased area for photosynthesis in the leaves. E. gas-filled air spaces.
Species richness refers specifically to
a. the numbers of individuals of each species present. b. the ability of larger animals to enrich themselves by successfully preying on smaller ones. c. the number of different species in the habitat. d. the feeding levels at which the animals are located. e. none of these.
An example of a DNA virus is
a. rhinovirus (cold virus) b. orthomyxovirus c. herpes virus d. HIV