Because enzymes affect the speed of chemical reactions without being consumed, they are referred toas:a
hydrogen acceptors.
b. activation energy.
c. catalysts.
d. cytochromes.
e. transformation proteins.
C
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Which of the following does not describe an aspect of the three-dimensional structure of the DNA helix?
A. The deoxyribose has the C-2' endo conformation, which defines the distance between adjacent phosphate groups. B. The hydrophilic backbone of the alternating sugar and phosphate groups is on the outside of the helix. C. The nearly planar and hydrophobic bases are stacked inside the helix relatively perpendicular to the backbone. D. Additional stability is conferred by the hydrogen bonding between the complementary bases. E. All of these choices correctly describe the structure of the DNA helix.
The illustration shows natural asexual plant reproduction from a runner via budding. Which form of artificial reproduction most closely resembles the process shown in this illustration?
a. cutting
b. grafting
c. layering
d. micropropagation
Which of the following zones is the location of the most biological activity?
A. the unsaturated zone B. the zone of soil moisture C. the zone of saturation D. the intermediate belt E. the capillary fringe
________ is directional growth responses of plants to a unidirectional source of light.
A. Phototropism B. Thermotropism C. Dormancy D. Thigmotropism E. Gravitropism