When a cone cell is stimulated by light, what will occur at the cell membrane?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones
A. excitation
B. inhibition
C. an action potential
D. hyperpolarization
E. depolarization
D. hyperpolarization
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When does a C4 plant use rubisco?
a. daytime only b. nighttime only
c. summer only d. winter only e. anytime the Calvin cycle is occurring
A plant systematist studies the physiological systems of plants
Indicate whether the statement is true or false.
If a flower has sepals, petals, and stamens but lacks carpels, then that flower is:
a. complete and imperfect. b. complete and perfect. c. incomplete and perfect. d. incomplete and imperfect. e. almost complete and almost perfect.
Several scientists, including Charles and Francis Darwin, Frits Went and others, demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments. Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?
A. Light caused a reduction in auxin concentration and a reduction in stem elongation on the lighted side of the plant stem, and thus a bending in the direction of the light. B. A combination of positive phototropism and a negative gravitropism. C. The stems actually were responding to the agar blocks that had been used in the experiments. D. Auxin concentration was equal on both sides (lighted and shaded) of the stem; however, the apical meristem responded to the presence of light. E. The transport of auxin to the shaded side of the plant stem stimulated stem elongation and a bending in the direction of the light.