Gravitropism is defined as:
A. growth in response to the Earth's magnetic field
B. gravity's pull on certain plant organs
C. growth in response to the force of gravity
D. any response to gravity that changes cell structures
E. growth mostly away from gravity
C. growth in response to the force of gravity
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Isotopes of the same element differ from each other in the number of
a. electrons and protons. b. neutrons only. c. protons and neutrons. d. electrons only. e. protons, neutrons, and electrons.
Photosystems are mainly
a. a grouping of energy-trapping molecules. b. enzymes for splitting water. c. a cluster of ATP molecules. d. a sugar assembly site. e. assemblies of thylakoids
The CORRECT sequence of stages of mitosis is ________
A) prophase, metaphase, anaphase, telophase B) telophase, prophase, anaphase, metaphase C) anaphase, interphase, prophase, metaphase, telophase D) interphase, prophase, metaphase, anaphase, telophase
The ratio between the uptake of carbon dioxide by photosynthesis and the release of carbon dioxide by respiration is approximately
A. 0.5 (i.e., half as much carbon dioxide is taken up by photosynthesis as is released by respiration). B. 5 (i.e., five times as much carbon dioxide is taken up by photosynthesis as is released by respiration). C. 0.1 (i.e., one-tenth as much carbon dioxide is taken up by photosynthesis as is released by respiration). D. 2 (i.e., twice as much carbon dioxide is taken up by photosynthesis as is released by respiration). E. 1 (i.e., about the same).