When insect populations exposed to insecticides develop resistance to these toxic chemicals over time, it is an

example of natural selection ____.



a. changing nonmorphological traits
b. altering reproductive mechanisms
c. acting in a goal-oriented manner
d. replacing morphological characteristics
e. facilitating mutations in populations


ANSWER: a

Biology & Microbiology

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Chloroplasts

a. have membrane bound nuclei containing DNA. b. evolved from cyanobacteria. c. have been found as symbionts inside mitochondria. d. evolved from photosynthetic eukaryotes. e. are the site of aerobic respiration.

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Lipid rafts are associated with which of the following activities?

A) responding to extracellular signals B) transport of nutrients across cell membranes C) immune responses D) transport of cholera toxin into cells E) All of the above are correct.

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Refer to Figure 46-2. Which of these lungs would have the greatest surface area?


a. 1
b. 2
c. 3
d. 4
e. 1, 2, 3 and 4 all have equal surface area.

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Graft-versus-host disease results under which conditions?

A) when immunocompetent cells are placed in an immunocompromised host B) when immunodeficient cells are placed in an immunocompetent host C) any time tissue is not exactly matched in a transplant D) only when adult cells are transplanted into a baby

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