The notion that organisms that are more distantly related should have time to accumulate more biochemical differences than those more closely related can best be illustrated using
A. radioactive isotope dating.
B. a molecular clock.
C. gel electrophoresis.
D. a geologic time scale.
Answer: B
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Some studies suggest that, as global warming progresses, tropical lowland trees may be limited in their ability to move
northward because of ____.
a. predicted desertification of temperate areas b. temperatures in the north still being too low c. flooding of coastal areas d. extreme weather events like hurricanes and blizzards e. development and habitat loss
The innermost layer of the root cortex, which is a selectively permeable barrier that helps control the
movement of water and dissolved minerals, is called the
a. endodermis. b. root cap. c. quiescent center. d. pericycle. e. root hairs.
Which of the following statements is NOT true about Fred Griffith's experiments?
a. Mice injected with smooth (S) bacteria die. b. Mice injected with heat-killed smooth bacteria die. c. Mice injected with heat-killed smooth bacteria and d. Mice injected with rough bacteria live. e. Smooth bacteria are transformed into harmless rough live rough (R) bacteria die.bacteria.
Sporopollenin is
A. pollen that is produced in a sporophyte. B. a tough protective covering on spores. C. a capsule housing pollen. D. food stored in pollen for the growing embryo. E. the conversion of pollen to spores.