Which microscope uses an ultraviolet light source?
a) Fluorescence microscope
b) Phase-contrast microscope
c) Darkfield microscope
d) Confocal microscope
Ans: a) Fluorescence microscope
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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. producing sufficient surface tension to overcome the pull of gravity. B. having a strong cohesive force and attaching to the surrounding vessel walls. C. storing heat and thus moving faster because of heat of vaporization. D. having an adhesive force, which allows them to attach to the vessel walls. E. being associated with hydrophobic molecules, which can result in upward movement.
Reduction involves the
A) loss of neutrons. B) gain of electrons. C) increase in oxidation state. D) gain of electrons and an increase in oxidation state. E) loss of neutrons, gain of electrons, and an increase in oxidation state.
Which statement is NOT true about stomata?
A. Guard cells take up potassium ions and water enters the guard cells. B. Stomata open and close on a daily basis, even if kept in the dark, on a circadian rhythm. C. There are two guard cells around each stomata. D. As guard cells become turgid, the stomata open. E. The blue light component of sunlight is a signal that can cause stomata to close.
Tumor Supressor Genes (TSGs)
What will be an ideal response?