A group of international students is having a heated discussion in the dining hall. "Your country needs to get its population under control!" asserts a student from the United States. "Perhaps," replies the Indian student, "but your country ________."
A. has a much higher birth rate
B. has the lowest infant mortality rate
C. also has a big population overgrowth problem
D. has the highest per capita resource consumption, ten times greater than mine
Answer: D
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In pea plants, yellow seed color is dominant to green, and wrinkled seed texture is dominant to smooth. In a dihybrid
cross between two heterozygous plants with yellow, round seeds, if the two alleles assort independently, what is/are the predicted phenotypic ratio(s) of the offspring?
a. all are yellow and round b. 8 yellow and round: 8 green and wrinkled c. 9 green and wrinkled: 4 yellow and round: 3 green and round d. 9 green and round: 3 yellow and round: 3 yellow and wrinkled: 1 green and wrinkled e. 9 yellow and round: 3 green and round: 3 yellow and wrinkled: 1 green and wrinkled
Electrical impulses that stimulate contraction of heart muscles are initiated in the
A) left ventricle. B) bundle of His. C) sinoatrial node. D) atrioventricular node. E) Purkinje fibers.
Which sequence of events describes natural selection?
A) A population of a mammal species varies in the length of their legs; water levels rise and the habitat becomes swampy; the individuals with shorter legs are better able to swim to food; the population evolves to become shorter-legged. B) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the animals have trouble moving in the water; the population changes to a shorter-legged type so they can move more easily in the water. C) Water levels rise, and a habitat becomes swampy; a population of a mammal species on high ground observes the change; individuals with shorter legs migrate to the area. D) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the act of swimming shortens the legs of the mammals; the offspring of the mammal species have shorter legs.
The complement fixation test uses red blood cells as the target for complement activation. Test serum containing antibodies is combined with a known amount of antigen in a tube, and then the RBCs and antibodies against the RBCs are added. A positive result for the complement fixation test would be
A) a line of precipitate near the bottom of the tube. B) a cloudy solution in the tube. C) loss of color in the tube. D) a fluorescent precipitate. E) a solution that is clear due to precipitation of RBCs.