The digestion of proteins in humans begins in the ____
a. large intestine
b. mouth
c. pancreas
d. small intestines
e. stomach
ANSWER: e
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In order to conserve H2O, land plants will close stomata to minimize transpiration, but closing stomata lowers CO2 concentration in the leaf. Drought thus __________ because __________
A. lowers photosynthesis; photorespiration increases B. lowers photorespiration; photosynthesis increases C. lowers photosynthesis; H2O is not available D. increases photosynthesis; photorespiration increases E. increases photosynthesis; CO2 increases
Which animal has the least advanced nerve cord?
a. chordate b. arthropod c. flatworm d. human e. octopus
Why are estuaries and coral reefs more productive than deeper regions of the ocean?
A. They have more access to light and nutrients. B. They have more access to light and lower salt concentrations in the water. C. They have more access to light D. They have more access to nutrients and lower salt concentrations in the water. E. They have lower salt concentrations in the water.
Chromosomes are aligned at the center of the cell during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.