Thomas Malthus proposed that
a. the food supply increased faster than the
population.
b. the population increased faster than the food
supply.
c. the food supply and population increased at the
same rate.
d. artificial selection was the key to evolution.
e. natural selection was the key to evolution.
Answer: b
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Which statement is true?
a. Nitrogen makes up at least 50% of the mass of plant cells. b. Macronutrients can be synthesized by the plant in small quantities. c. Hydrogen bonding allows plants to transport water to the leaves. d. One-half of the volume of a plant comprises carbon.
A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?
I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin. II-The freed-sites of actin bind to myosin to form cross bridges. III-Calcium ion binds to the troponin. A. II, III, and I B. III, II, and I C. III, I, and II D. I, III, and II E. I, II, and III
These data support the trade-off that
A) size of offspring is correlated with number of offspring. B) size of offspring is correlated with size of mother. C) number of offspring is correlated with survival. D) habitat type is correlated with size of mother.
An aquatic microbe that can grow only near the surface of the water is probably which of the following?
A) a phototroph B) a heterotroph C) a chemotroph D) a lithotroph E) an anaerobe