An advantage that simple multicellular eukaryotes have over single-celled organisms is the ability:
A. of the cells in the multicellular organism to
communicate with one another.
B. of the cells in a group of cells to avoid
predation.
C. for autotrophic cells in the multicellular
organism to supply heterotrophic cells with
nutrients.
D. to respond the external environment more
efficiently.
B
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In the dark, the Na+ channels in the outer segments of rod cells are
A. open. B. closed. C. primarily affected by inhibitory neurotransmitter input. D. important in making the cell hyperpolarized in this resting state.
Scientists have found that bluegill sunfish receive the highest energy return from large Daphnia, an intermediate return from medium Daphnia and the smallest return from small Daphnia. If you were to stock aquaria with equal proportions of small, medium, and large Daphnia, but vary the density of Daphnia from very low to very high, how do you think bluegills would react? Check all that apply.
_____ Bluegills would consume a larger proportion of small Daphnia in the very low density aquaria compared with the medium or high density aquaria. _____ Bluegills would consume equal proportions of large Daphnia in all aquaria. _____ In medium density aquaria, bluegills would select medium sized Daphnia over small or large Daphnia. _____ The tendency to select large Daphnia over small or medium Daphnia will increase as the density of Daphnia in the aquaria increases.
Which one of the following would result in an increase in the rate at which a population grows?
A. reduction in the birthrate B. reduction in the number of females C. reduction in the death rate D. reduction in the number of males
Starting with one molecule of glucose as an input, how many oxidation reactions occur during the Krebs cycle?
A. one B. three C. two D. eight E. six