Which term refers to the nonselective movement of water and a number of solutes into the excretory system tubules?
a. filtration
b. release
c. secretion
d. reabsorption
Ans: a. filtration
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A house plant seems to be growing slowly and lacks its normal bright green color. You call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is required before NADPH can function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.
Archaeans and bacteria are generally included in the:
a. seston. b. tripton. c. bacterioplankton. d. viriplankton. e. pleuston.
The movement of materials already in the phloem can be described using the term(s):
a. source-to-sink only b. pressure flow only c. cohesion only d. both active transport and cohesion e. both source-to-sink and pressure flow
Which of the following represents normal fertilization in humans?
A. 2n + 2n = 4n B. n + 2n = 2n C. n + n = 2n D. 2n = n