In a population of lemmings, a sudden freeze that caused many of the lemmings to die is an example of a
A) living and density-dependent factor.
B) nonliving and density-independent factor.
C) living and density-independent factor.
D) normal boom-and-bust cycle.
E) nonliving and density-dependent factor.
B
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From an evolutionary perspective, germ-line mutations are more significant than somatic mutations. This is because:
A. somatic mutations affect only one or a few cells. B. somatic mutations are generally harmful. C. only germ-line mutations will appear in an individual's descendants. D. only germ-line mutations are potentially beneficial. E. somatic mutations affect only one or a few cells and only germ-line mutations will appear in an individual's descendants. Answer Point Value: 1.0 points Answer Key: C 5 Remember that, in Mendel's garden peas, the yellow gene determines flower color, with the A (yellow) allele dominant to the a (green) allele. In a population of 200 plants, the genotype frequencies are 50% AA, 25% Aa, and 25% aa. What are the allele frequencies? A. 50% A, 50% a B. 50% A, 25% a C. 87.5% A, 12.5% a D. 62.5% A, 37.5% a E. 75% A, 25% a
Which fungal group includes organisms used for the manufacture of anesthetics, birth control agents, industrial alcohols, meat tenderizers, and yellow food coloring?
A. Glomerulomycetes B. Microsporidia C. Ascomycetes D. Zygomycetes E. Basidomycetes
Which is the metabolic breakdown of substances?
a. catabolism b. anabolism c. using ATP d. photosynthesis e. formation of ATP
Which of the following would you NOT expect to find in phloem sap?
a. Carbohydrates. b. Hormones. c. Water. d. Amino acids. e. Nitrate.