__________ are living cells that do not conduct sugar themselves but play a crucial role in assisting
the movement of sugars.
a. Sieve tube members
b. Sieve plates
c. Tracheids
d. Vessel elements
e. Companion cells
E
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The "one gene–one enzyme" hypothesis of George Beadle and Edward Tatum was an oversimplification because:
A. mutations may not completely inactivate an enzyme. B. some enzymes contain more than one polypeptide. C. some enzymes can be phosphorylated. D. auxotrophs can be corrected. E. some RNAs are independently catalytic.
Tissues suspected of containing Acanthamoeba cysts can be observed using various stains. A cyst that stains black has most likely been stained with the __________ stain
a. methenamine silver b. periodic acid–Schiff (PAS) c. Giemsa d. Wright's
Chytrids are unique among fungi because they are the only ones that have ________
a. symbiotic relationships in lichens b. flagellated cells c. zygospores d. sexual reproduction
Which of the following statements is NOT
TRUE? a. Photons are packages of solar energy. b. Each photon consists of a fixed amount of energy. c. The least energetic photons travel in longer wavelengths. d. Photons with different energy levels are perceived as exhibiting different colors. e. Photons of visible light have wavelengths shorter than 350 nanometers