A population of viruses with similar characteristics is called a _____
A) strain
B) species
C) type
D) genome
E) sense
Answer: A
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A famous marathon runner has been having trouble conceiving, and her doctor has advised taking a break from the sport -- why?
A. Excessive exercise can lower gonadotropin-releasing hormone (GnRH) levels, disrupting ovulation. B. The shaking movement that running produces can prevent implantation of the embryo. C. Excessive exercise can raise humen chorionic gonadotropin (hCG) levels, disrupting ovulation. D. High body temperatures are disruptive to oocyte production, which normally form at 34°C.
Chlorophyll b absorbs green wavelengths of light that chlorophyll a cannot absorb. In this respect, chlorophyll b acts as
A. an accessory pigment. B. a more efficient pigment. C. a light absorber in the green light. D. an energizer for photosynthetic bacteria.
The combined effects of inhibitory and excitatory effects on a postsynaptic cell will decide whether that cell generates an action potential. This principle is called ________
A) potentiation B) internalization C) threshold D) summation
Which of the following is not a factor in increased incidence of fungal infections?
A) urban development B) increasing antibiotic resistance C) climate change D) deforestation E) increasing number of people living with immunosuppression