The normal flora that inhabit our body surfaces ____
a. are harmful
b. competitively exclude more harmful species
c. produce vitamin C
d. become even more beneficial if they invade tissues
e. participate in phagocytosis of pathogens
ANSWER: b
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Which of the following LEAST belongs with the others?
A. thymine dimer B. UvrA protein C. direct repair D. nucleotide excision repair E. UvrC protein
Jim is suffering from congestive heart failure, in which blood flow is backed up in his lungs and excess fluid is escaping the blood and accumulating in his lung tissue. If untreated, increasing pulmonary edema will lead to death by suffocation. What is the most-likely cause of Jim’s congestive heart failure?
A. Contraction of his right atrium is not keeping up with contraction of his left atrium. B. Contraction of his left ventricle is not keeping up with contraction of his right ventricle. C. Jim’s pulmonary semilunar valve is not opening properly. D. Jim’s SA node is malfunctioning. E. Jim’s right atrioventricular valve (tricuspid valve) is not closing properly. Gather Content What do you already know about the path of blood between the heart and the lungs? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Phragmoplast formation occurs in animal cells near the mid-body.
a. true b. false
Competitive exclusion is based on the idea that
a. one species will hold some sort of advantage over the other one. b. no two species can completely occupy the same niche. c. the more two species overlap in their capacity to obtain and use resources the less likely they are to coexist. d. all of these are true. e. none of these are true.