Individual species will continually evolve as a result of:
a. coevolution.
b. convergent evolution.
c. punctuated equilibrium.
d. natural selection.
e. gradualism.
D
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A microbiologist suspects a strain of Staphylococcus aureus is resistant to methicillin. What would be the best approach to test this suspicion?
A. Perform a Gram stain. B. Sequence the chromosome looking for resistance genes. C. Calculate the doubling time for the bacteria. D. Inject the bacteria into a host animal and look for disease symptoms. E. Add methicillin to the growth plates. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about antibiotic resistance? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
If atmospheric pressure is 760 mm Hg, what would you expect the pressure inside the lungs to be during a forceful
expiration? a. 0 mm Hg b. 750 mm Hg c. 756 mm Hg d. 760 mm Hg e. 764 mm Hg
Bats in Cameroon, tropical West Africa, play a greater diversity of ecological roles than do bats in Ontario, Canada. Fish in the mouth of a Mexican river system play a greater diversity of ecological roles than do fish in the headwaters of the same river system. Both of these observations are supportive of which of the following hypotheses?
A) Species diversity is positively correlated with niche diversity. B) Species diversity is negatively correlated with niche diversity. C) Species diversity shows no direct relationship with niche diversity.
Which of the following statements is true?
(a) The NADH dehydrogenase complex can pump more protons than can the cytochrome b-c1 complex. (b) The pH in the mitochondrial matrix is higher than the pH in the intermembrane space. (c) The proton concentration gradient and the membrane potential across the inner mitochondrial membrane tend to work against each other in driving protons from the intermembrane space into the matrix. (d) The difference in proton concentration across the inner mitochondrial membrane has a much larger effect than the membrane potential on the total proton-motive force.