What causes tidal overmixing in estuaries?
a. strong tidal currents.
b. strong river flow.
c. an unstable water column.
d. downwelling.
e. animal migrations.
C
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Which of the following correctly describes the reproduction of males in Daphnia?
A) Daphnia males are produced asexually from unfertilized eggs. B) Daphnia males are produced sexually through fertilization of eggs but are sterile from birth. C) Daphnia males are produced from a pseudo-sexual union of two eggs. D) Daphnia males are produced asexually but are sterile from birth.
If a plant is exposed to a toxin that made the thylakoid membranes permeable to hydrogen ions, predict the impact of the toxin on each of the following:
A. The hydrogen ion gradient across the thylakoid membrane B. The oxidation of NADPH to NADP+ C. The pH in the lumen of the thylakoid D. The production of carbohydrate in the Calvin cycle E. The amount of oxygen evolved in the lightdependent reactions
When an enzyme becomes denatured, it
a. increases in effectiveness. b. loses its requirement for a substrate. c. forms an enzyme–substrate complex. d. loses its ability to function.
The Root vegetables like potatoes, carrots, and beets that we eat store sugars made by photosynthesis, which can later be used for plant growth.
a. true b. false