The enzyme lysozyme offers protection from some ____ by breaking down their ____
a. viruses; protein coat
b. bacteria; cell walls
c. viruses; envelopes
d. bacteria; DNA
e. viruses and bacteria; nucleic acids
ANSWER: b
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Autotrophy has been observed among the ________.
A. cyanobacteria B. extreme thermophiles C. methanogens D. All of the choices are correct.
Organisms that form lactate, ethanol, and CO2 as end products of glucose metabolism are called ________ fermenters.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements concerning cyclin-dependent kinases (CDKs) is NOT true?
A. CDKs are enzymes that attach phosphate groups to other proteins. B. CDKs are active, or "turned on," when complexed with cyclins. C. CDKs are present throughout the cell cycle. D. CDKs are inactive, or "turned off," in the presence of cyclins.
P700 is located in photosystem ____ and is comprised of chlorophyll ____ absorbing light with a
wavelength of 700 nm.
a. I; b b. I; a c. II; b d. II; a e. I and II; a