With regard to RNA polymerase proofreading ability, which of the following is correct?
A) It is a very stringent activity, no tolerance for mistakes.
B) It is similar to that of DNA polymerases.
C) There are specialized mRNA repair pathways that fix errors.
D) There is absolutely no proofreading that needs to be done.
E) The 3' ? 5' exonuclease activity is sufficient
A) It is a very stringent activity, no tolerance for mistakes.
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Which of the following is the best evidence for the lock and key hypothesis of enzyme action?
A. All isolated enzymes have been identified as proteins. B. Enzymes determine the direction of a reaction. C. Enzymes are found in living organisms and speed up certain reactions. D. Compound similar in structure to the substrate inhibits the reaction
The uplift of the Isthmus of Panama, a geological event that occurred about five million years ago, separated
populations of marine organisms and led to ____.
a. allopatric speciation b. sympatric speciation c. gametic isolation d. hybrid sterility e. hybrid inviability
If more individuals move out of a forest than into it every year, the ________ rate is high
A) immigration B) fidelity C) emigration D) migration
According to this phylogeny, which of the following is true?
a. All chordates have a neural tube. c. Echinoderms have a neural tube. b. Amphioxus have a neural crest. d. All chordates have a neural crest.