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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology