Mammals and birds eat more often than reptiles. Which of the following traits shared by mammals and birds best explains this habit?
A) endothermy
B) ectothermy
C) insulating body cover
D) amniotic egg
E) terrestrial
Answer: A
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Scientists in Switzerland compared the total surface area of the small intestine in different species of bats. When the calculations were done as if the inner mucosal surface was smooth, the average inner surface area of the intestinal tube was 9.1 cm2 in one species. The mucosal surface area increased to 48 cm2 when the villi were factored in and reached a total of 0.13 m2 after adding in the membrane surface area of the microvilli. Approximately what percent of the total surface area of the small intestine in these bats can be attributed to the membrane surface area of the microvilli?
A. 12% B. 78% C. 55% D. 96% E. 28% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about microvilli? 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?
In what way(s) is the science of biology influencing and changing our culture?
A) by helping us understand the relevance of evolution to human health B) by revealing how mutations in genes can lead to disease C) by providing new tools for forensic investigations D) all of the above
The cascade of events determining whether bacteriophage lambda elects to purpose lysogeny or a lytic cycle begins with a race between the production of the lambda repressor and ________.
A. endolysin B. integrase C. N protein D. Cro protein
Which of the following is an active enzyme?
A) apoenzyme B) cofactor C) coenzyme D) holoenzyme E) subtrate