Suppose you are testing a treatment for AIDS patients and find that 75% respond well, whereas 25% show no improvement or a decline in health. You should
A) conclude that only 75% of AIDS patients should be treated.
B) begin work on developing a new drug.
C) conclude that you have proven the effectiveness of the drug.
D) review the results, modify the drug or the dosage, and repeat the experiment.
E) discontinue experimentation with this treatment because 25% of patients did not improve.
D
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Refer to the figure above. Which structure is responsible for stabilizing DNA in its single-stranded form?
A) A B) B C) C D) D
What challenges does respiration in water present? Check all that apply.
_____ The density of water is very high relative to air. _____ Water holds approximately 30 times less oxygen when compared to air. _____ Water requires an additional energy expenditure to move across epithelial surfaces. _____ Water moving across respiratory surfaces removes heat from the animal. _____ Water breathing animals have a high risk of desiccation.
The significance of Fred Griffith's experiment
in which he used two strains of Streptococcus pneumoniae is that a. pathogenic bacteria function differently in mice than in other organisms. b. it demonstrated that harmless bacteria can become transformed into disease-causing bacteria by bacteria a transformation factor. c. it established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains. d. dead cells lose their genetic information. e. the genetic material is DNA, not protein
You have two types of cells that both produce a particular protein. You notice that when you heat up the cells, the first type of cell's protein loses function while the second type of cell's protein retains function. How is this possible?
a. The first cell has weaker mRNA. b. The protein of the second type of cell has a completely different primary structure from the protein of the first type of cell. c. The second type of cell expresses a chaperone protein that the first type does not. d. None of the other answer options is correct.