DNA codes for the production of
a. proteins.
b. minerals.
c. inorganic molecules.
d. vital gasses.
e. water.
Answer: a
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Which of the following are accessory photosynthetic pigments that expand the spectrum of light that
provides energy for photosynthesis:a. carotenoids. b. chlorophyll a. c. chlorophyll b. d. Both caroternois and chlorophyll a. e. Both carotenoids and chlorophyll b.
Following electrical stimulation of a muscle cell, calcium functions to
A) stimulate the enzymes that produce ATP. B) bind to the protein troponin. C) leak out of the muscle cell to re-establish the membrane potential. D) break down acetylcholine. E) maintain the relaxed state of the muscle.
Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:
A. having an adhesive force, which allows them to attach to the vessel walls. B. producing sufficient surface tension to overcome the pull of gravity. C. being associated with hydrophobic molecules, which can result in upward movement. D. storing heat and thus moving faster because of heat of vaporization. E. having a strong cohesive force and attaching to the surrounding vessel walls.
The ______ is a single, main root that is adapted for storage.
A. Fibrous root B. Taproot C. Adventitious root D. Prop root E. Lateral root