Three critical amino acids in the active site of an enzyme are threonine, serine, and glutamic acid. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic
B. hydrophilic, with a negative charge
C. hydrophilic, with a positive charge
D. hydrophilic, but without a charge
C
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Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Ctenophores and Cnidaria both have nerve and muscle cells, but Ctenophores lack Hox genes that occur in both Cnidaria and Porifera. What is the most likely explanation?
a. Porifera diverge from a common ancestor before nerve and muscle cells evolved, then Cnidaria and Ctenophores absorbed viral genomes containing Hox genes from plasmids contained within their environment. b. Hox genes were deleted from the Ctenophore genome after Ctenophores diverged from a common ancestor with Cnidaria, and Porifera developed nerve and muscle cells. c. Hox genes developed in a common ancestor of Cnidaria and Porifera after it diverged from an ancestor in common with Ctenophores, then nerve and muscle cells developed via parallel evolution. d. Hox genes are produced by mitochondria; Porifera lack mitochondria, and therefore cannot contain Hox genes. The presence of nerve and muscle cells is entirely unrelated and irrelevant.
A microaerophile
A. needs normal atmospheric levels of oxygen. B. requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen. C. grows best in an anaerobic jar. D. grows with or without oxygen.
Measure of the tendency of water to move across a selectively permeable membrane; visible as an increase in liquid on the side of the membrane with higher solute concentration.
What will be an ideal response?