Photoreceptors respond to light energy. When activated, photoreceptors cause Na+
A. an action potential
B. depolarization of the cell membrane
C. repolarization of the cell membrane
D. hyperpolarization of the cell membrane
D
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Which of the following is NOT a feature of
trypanosomes? a. anaerobic respiration b. single, large mitochondrion c. cause widespread and serious infections of humans and cattle in the tropics d. life cycle involves an intermediate, bloodsucking insect host e. causative agents of Chagas disease and African sleeping sickness
On the illustration, “A” and “B” should be labeled
respectively a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. none of these
When hemoglobin binds hydrogen ions it is acting as a(n)
a. neutralizer. b. buffer. c. acid. d. base. e. cation.
Which of these pairings is not correct?
a. diapsids?lizards b. diapsids?turtles c. synapsids?dinosaurs d. synapsids?mammals e. synapsid-birds