Which of these is currently considered the best definition of a gene?
A. A gene codes for either a polypeptide or an RNA molecule.
B. A gene codes for a single enzyme.
C. A gene codes for a single polypeptide.
D. A gene codes for a single protein.
E. A gene codes for a particular ribozyme.
Ans: A. A gene codes for either a polypeptide or an RNA molecule.
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Which of the following sources of pollution is considered a point source? a. Oil dripping from cars as they cross the railroad tracks
b. Runoff from farm fields during the heavy spring rains draining into the Mississippi River. c. None of these choices. d. Air pollution in an industrialized city. e. Municipal water treatment plant discharging into the river.
The function of the polymerase chain reaction in genetic engineering is to
A. link together newly joined fragments of DNA. B. cut DNA into many fragments. C. make multiple copies of a specific segment of DNA. D. separate fragments of DNA by their length and electrical charges. E. carry DNA into a new cell.
Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of DNA up to
approximately how many times in an hour? a. 10 b. 1,000 c. 10,000 d. 200,000 e. 2,000,000
You're a doctor visiting with a patient, and you remind her to get her flu vaccination this year. She looks at you quizzically and says, "I don't need a vaccination. I got one last year." Which of the following would be the most appropriate biological explanation?
A. " Flu vaccinations wear off after a year, so you should really get another one." B. "The flu virus evolves very rapidly, so last year's vaccination will not be as effective as this year's vaccination." C. "Well, you should be okay then." D. "Well, it is free."