Countries with the lowest GDP per capita have work forces engaged for the most part in
A) primary activities.
B) secondary activities.
C) tertiary activities.
D) quaternary activities.
Answer: A
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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.
A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.
Which of the following is (are) true of natural selection?
A) It requires genetic variation. B) It results in descent with modification. C) It involves differential reproductive success. D) It requires genetic variation, results in descent with modification, and involves differential reproductive success.
What will occur if a bacterial cell with a weakened or damaged cell wall is placed in pure water?
a. The cell will remain the same size b. The cell will swell and burst c. The cell will form endospores d. The cell will shrink e. The cell will form a new cell wall
Order the steps involved in the activity of a muscle spindle:1. Muscle spindle is stretched.2. Reflex action occurs.3. Contraction of muscle fibers adjoining the muscle spindle.4. Nerve signals are generated.5. The muscle relaxes.6. The muscle's length increases.
A. 2,1,6,3,4,5 B. 2,3,1,4,5,6 C. 5,6,1,4,2,3 D. 5,1,2,4,3,6 E. 1,6,2,4,5,3