The usefulness of today's antibiotics has been diminished by:
A. The limited number of antibiotics available compared to the number of microbe
B. The emergence of new antibiotic-resistant strains of bacteria
C. The emergence of new strains of human tissue cells that are resistant
D. Difficulties is production
Ans: B. The emergence of new antibiotic-resistant strains of bacteria
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In the first few minutes after host cell infection, the virus undergoes an eclipse
Indicate whether the statement is true or false.
In the experiment above, guppy color patterns (spots) were measured in populations exposed to increasing amounts of predation. From this you could conclude that ____ .
A. evolutionary changes take millions of years to appear
B. predators are less likely to catch and eat brightly colored guppies
C. predators are more likely to catch and eat brightly colored guppies
D. brightly colored guppies are more likely to reproduce in the presence of predators
E. predators do not affect the color patterns of guppies
Martha McClintock found that the menstrual cycles of female college roommates became synchronous after 6 months of living together
She also found that armpit odors from one group of women affected the menstrual cycles of other women who sniffed the odors. These findings might indicate that A) women have conscious control over their menstrual cycles. B) something in the water in the dorm influences the women's cycles. C) pheromones are involved in menstrual synchrony. D) menstrual cycles are not influenced by nerve impulses. E) eating the same foods causes menstrual cycles to become synchronous.
X-ray crystallography has revealed and confirmed many details about the ribosome. All of the following are such details, EXCEPT ________
A) the ribosome is a dynamic structure that changes during its different functional states B) rRNAs are more likely than proteins to be the catalytic molecule of the ribosome C) the distance the tRNA must travel between the E, P, and A sites is considered to be relatively short D) rRNA in the ribosome is in direct contact with the different loops of the tRNA molecule E) the wobble hypothesis is further supported