Which process best describes how viruses may originate in animals and eventually be transmitted to humans, causing outbreaks?
A. denaturation
B. asexual reproduction
C. evolution
D. conjugation
Answer: C
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Which of the following statements is TRUE of restriction enzymes?
A. They are not naturally produced by bacteria, but are bioengineered by them. B. They protect bacterial cells from invasion by foreign DNA. C. There are less than 10 restriction enzymes known. D. They cleave the DNA backbone at only one location. E. They cleave DNA only at sites of adjacent thymine bases.
Chlorine
A. readily reacts with organics to produce potentially carcinogenic trihalomethanes. B. is an effective, inexpensive, disinfectant able to destroy all types of microorganisms. C. is unaffected by the presence of organic material. D. is ineffective when diluted. E. readily reacts with organics to produce potentially carcinogenic trihalomethanes AND is an effective, inexpensive, disinfectant able to destroy all types of microorganisms.
Water moves through a plant by each of the following methods except
A. from cell to cell through plasmodesmata. B. through the Casparian strip. C. through the spaces between cells. D. through vessel members. E. from cell to cell across plasma membranes.
________ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.
A. Gamma B. Particle C. Ultraviolet D. Infrared E. Ionizing