Which of the following is the primary fuel source for residential and commercial uses?
a. nuclear energy
b. renewable energy
c. coal
d. natural gas
e. petroleum
ANSWER: d
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A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand. Others are dark and blend into the rocks. What may happen to this population of lizards over time?
A. They may evolve into two separate species as a result of directional selection. B. They may remain one species as a result of stabilizing selection. C. They may remain one species as a result of disruptive selection. D. They may evolve into two separate species as a result of disruptive selection. E. They may remain one species as a result of directional selection.
Humans are unable to digest which type of carbohydrate?
a. glucose b. glycogen c. starch d. cellulose e. fructose
Which of the following explains why a saturated fat and an unsaturated fat are different?
a. A saturated fat contains double bonds, while an unsaturated fat does not. b. An unsaturated fat contains double bonds, while a saturated fat does not. c. A saturated fat is liquid at room temperature, while an unsaturated fat is not. d. A saturated fat can be called an oil, while an unsaturated fat cannot.
A locus is
a. a recessive gene. b. an unmatched allele. c. a sex chromosome. d. the location of a specific gene on a chromosome. e. a dominant gene.