Pruisner concluded that the infective agent of CJD was not a virus because it was not sensitive to
radiation which mutates nucleic acids.
_____________ Indicate whether the statement is true or false.
T
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Commercial fertilizer labels prominently display three numbers, which indicate the content of three elements needed by most plants as macronutrients. These elements in number sequence are
A. zinc, magnesium, and potassium. B. carbon, sulfur, and nitrogen. C. nitrogen, zinc, and copper. D. nitrogen, phosphorus, and potassium. E. copper, nitrogen, and phosphorus.
How does a scientist get the corrected version of a gene into the cells of a gene therapy patient?
A. It is attached to a food molecule, such as glucose and is then ingested by the individual. B. It is directly injected with a microscopic hypodermic needle. C. It is attached to the surface of microscopic beads and is then shot into the individual (i.e., shotgun method). D. It is delivered with a modified virus.
All living organisms are dependent upon plants because
a. plants produce carbon dioxide as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. they remove oxygen from the atmosphere. e. they contribute to the problems generated by the greenhouse effect.
A straight-chain carbon compound constructed from _____ must contain at least one carbon-carbon double bond.
A. 6 hydrogen, 2 carbon B. 6 hydrogen, 3 carbon C. 6 hydrogen, 2 carbon, 1 oxygen D. 8 hydrogen, 3 carbon, 3 oxygen E. 14 hydrogen, 6 carbon