James misspoke at the banquet last night and became embarrassed. His face looked red because the facial arteries and arteriole muscles relaxed. These arteries and arterioles were ________
A) dilated B) burst C) clogged D) constricted
Answer: A
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Lysosomes maintain an acidic environment by actively pumping protons into their interior.
Answer the following statement true (T) or false (F)
A eusocial animal ______.
A. lives alone B. works alone C. breeds continuously D. lives within a group with a reproductive division of labor E. least likely to exhibit altruistic behavior
CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as corn in which of the following ways?
A. CAM plants are limited to producing CO2 for the Calvin cycle during the day, while C4 plants produce CO2 for the Calvin cycle both during the day and at night. B. CAM plants are more efficient at producing sugar than C4 plants regardless of environmental conditions. C. CAM plants minimize photorespiration whereas C4 plants do not. D. CAM plants use both mesophyll and bundle sheath leaf cells for photosynthesis whereas C4 plants do not. E. CAM plants produce a 4-carbon molecule in the first step of carbon fixation, but C4 plants do not.
The 2000–2004 drought in California:
a. shortened the growing season of the mustard plant. b. led to earlier flowering in the mustard plant. c. created selective forces that changed the characteristics of the mustard plant. d. All of the above. e. A and C.