Proteins in psychrophilic cells generally have ________ than proteins found in cells that grow optimally at higher temperatures
a. fewer ?-helices and more ?-sheets
b. fewer hydrogen bonds
c. more ?-helices and fewer ?-sheets
d. more hydrogen bonds
Answer: C
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Which of the following is not true of the ? helix?
A. The ? helix forms a right-handed spiral. B. Amino acid R groups point toward the helical axis. C. The hydrogen bonds of an ? helix all point in the same direction. D. A typical protein contains about one-third ? helix. E. All of the answers given are correct.
A diploid cell has 44 chromosomes. After meiosis I, how many chromosomes does it have? How many chromatids?
A) 22; 22 B) 22; 44 C) 44; 22 D) 44; 44
The manta ray feeds on:
a. larger fish. b. surface and diving birds. c. squid. d. small fish and plankton. e. other rays.
Which of the following statements is TRUE?
A. Capsule stain uses alkali dye B. There are more than one correct answers C. Positive stain binds to the cell wall of bacteria D. Positive stain uses alkali dyes because it binds to the cell E. Gram stains takes advantage of negative dye