Why is combination drug therapy for HIV/AIDS less likely to lead to resistance than single drug therapy?
A. There are fewer side effects associated with combination drug therapy, and the appearance of resistance is directly related to the severity of side effects.
B. The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.
C. In the presence of multiple drugs, the mutation rate of HIV decreases.
D. The drugs improve the immune system so that it is better able to find and remove virus particles.
Answer: B. The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.
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a. Neritic zone b. Intertidal zone c. Abyssal zone d. Aphotic zone
Which one of the following correctly describes the direction of translation?
A. DNA is read 3'-to-5' and RNA is synthesized 5'-to-3'. B. DNA is read 3'-to-5' and RNA is synthesized 3'-to-5'. C. DNA is read 5'-to-3' and RNA is synthesized 3'-to-5'. D. DNA is read 5'-to-3' and RNA is synthesized 5'-to-3'. E. The direction varies in different genes.
Which of the following is not a function of stems?
a. modified for sexual reproduction b. absorb nutrient minerals c. produce new tissues d. transport water and dissolved nutrient minerals e. support leaves and flowers
ATP, NADPH, CO2, and a five-carbon starter molecule called ribulose are needed for the _____________________ of photosynthesis to occur.
A. light-dependent reactions B. light-independent reactions C. light-capturing events D. All of the choices are correct.