Apical dominance is an effect that causes ____
a. a directional adjustment of growth in response to environmental stimuli
b. leaves and other plant parts to fall off, or senesce
c. roots to lengthen while inhibiting shoot growth
d. lateral buds to become active when a shoot is lengthening at its tip
e. lateral buds to stay dormant when a shoot is lengthening at its tip
ANSWER: e
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Which of the following can be used as electron acceptors during anaerobic respiration?
A. Carbon dioxide B. Nitrate C. Sulfate D. All of the choices are correct.
The extinction of the _____ during the end-Cretaceous mass extinction allowed mammals to diversify through the process of _____
A. ammonites; peripatric speciation B. dinosaurs; peripatric speciation C. dinosaurs; adaptive radiation D. ammonites; adaptive radiation E. cephalopods; adaptive radiation
Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?
a. There was more enzyme present in the more concentrated solutions. b. A greater amount of heat was generated in the more concentrated solutions. c. The more concentrated solutions lowered the activation energy of the reaction. d. The higher substrate concentrations in the more concentrated solutions speeded the reaction. e. The density of the water was lower in the more concentrated solutions.
Arteries differ from veins in that
A. veins carry blood to the internal organs of the body. B. arteries have valves that veins do not have. C. veins have thinner walls than arteries. D. the pressure in veins is greater than that in arteries.