The 2007 review on climate change concluded that the warming in recent decades is attributed to ________
a. human induced increases in greenhouse gases
b. increased geothermal activity
c. increased water vapor in the atmosphere
d. volcanic eruptions
e. solar output
a
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Which of the following accurately describes the process used to make Dolly the sheep?
A. Mitochondrial DNA was taken from one female and injected into the mammary of another female. B. A sheep embryo was produced by in vitro fertilization. At an early stage, the cells of the embryo were separated, and each cells was put into a surrogate sheep mother. C. A mammary cell of one sheep was fused with an enucleated egg of another sheep. The resulting diploid embryo was placed in a surrogate sheep mother. D. A set of twins — one male and one female — were mated. Since the twins had identical DNA, their lamb was a clone. E. The sheep to be cloned was given a drug that induced the cells of her ovary to divide by binary fission. The resulting diploid eggs did not need to be fertilized.
Which of the following elements is considered an essential micronutrient for plants?
a. calcium b. lithium c. sulfur d. nickel e. oxygen
A patient who has had a severe hemorrhage accidentally receives a large transfusion of distilled water directly into a
major blood vessel. What effect will this have on the patient? a. It will have no unfavorable effect as long as the water is free of bacteria. b. It will have serious, perhaps fatal consequences because there would be too much fluid to pump. c. It will have serious, perhaps fatal consequences because the red blood cells could shrink. d. It will have serious, perhaps fatal consequences because the red blood cells could swell and burst. e. It will have no serious effect because the kidney could quickly eliminate excess water.
When the growth rate of a population tapers off at a certain point and remains at the same point indefinitely, the population is said to have reached the
A. maximum population size. B. carrying capacity. C. biotic potential. D. lag phase.