Which of the following statements best distinguishes scientific hypotheses from scientific theories?
A) Hypotheses describe and theories explain.
B) Hypotheses explain and theories describe.
C) Hypotheses are usually narrower in scope; theories have broader explanatory power.
D) Hypotheses are used in experiments. Theories are not tested.
E) Hypotheses are generally supported by more evidence than theories.
Answer: C
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Alanine and lysine are both amino acids. Not eating enough lysine can lead to protein deficiency, whereas not eating enough alanine does not lead to protein deficiency. Why is this the case?
A. Alanine can be synthesized by cellular biochemical pathways, whereas lysine cannot. B. Alanine can be easily replaced by other amino acids in protein synthesis, whereas lysine cannot. C. Lysine is needed in much larger quantities for protein synthesis than alanine. D. The body has a more difficult time absorbing lysine than alanine, so more must be consumed to avoid protein deficiencies. E. All of the answer options are correct.
A 36-year-old emergency medical technician (EMT) is exposed to a patient with brucellosis. Blood cultures are drawn from the EMT and reported as negative after 1 week. Which of the following statements explains this discrepancy?
a. The blood culture system is most likely not correctly functioning. b. Brucella does not grow in the blood. c. The blood culture bottles are most likely expired. d. The blood should have been incubated for a minimum of 3 weeks.
two key observations underlying natural selection are that members of a population vary in their ----- and that all species can produce more offspring than the environment can support
Fill in the blank(s) with the appropriate word(s).
An individual is moderately dehydrated and reaches for a beer to quench his thirst. Although this person thinks that he is hydrating himself, he is actually causing additional dehydration. Why is this the case?
A) The alcohol in the beer inhibits antidiuretic hormone. B) The alcohol in the beer causes a decrease in sodium reabsorption in the nephron. C) The alcohol in the beer inhibits aldosterone. D) The alcohol in the beer causes an increase in the activity of renin.