Leaves that are narrow and have a single vein are termed ____, and leaves that are broad and have multiple veins are
termed ____.
a. rhizomes; rhizoids
b. rhizoids; megaphylls
c. microphylls; rhizomes
d. microphylls; megaphylls
e. megaphylls; macrophylls
ANSWER: d
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The portion of the DNA molecule that is translated is composed of
a. introns. b. anticodons. c. exons. d. transcriptons. e. exons and introns.
Which of the following statements about isotopes in living systems is false? a. Radiation can be used to create visual images
b. Living organisms can avoid taking up a radioactive isotope but still absorb the normal isotope of the same element. c. Radioactive sugar is used to measure rates of cell activity. d. Radioisotopes can be used as tracers to follow the movement of an element through a living system.
When is a glucose molecule produced by the Calvin cycle?
a. after three turns, during the Fixation stage b. after six turns, during the Regeneration stage c. after six turns, during the Reduction stage d. after eight turns, during the Fixation stage
In a person with a disease in which the mitochondria do not produce enough energy for the cell, which organs would be the most severely affected?