Topoisomerase functions by ____
a. creating cuts in the DNA to relieve over-twisting and strain ahead of the replication fork
b. binding DNA polymerase to hold it tightly to the template DNA
c. unwinding the DNA double helix to expose the template strands for replication
d. binding the newly synthesized DNA to re-twist it into a double helix after replication
e. reading the DNA template and synthesizing a complementary strand of DNA
ANSWER: a
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A sequence of bases in the middle of an RNA used to encode a polypeptide has the sequence UUA—AUG—CGU. Is it possible to infer the sequence of the amino acids encoded by this RNA?
A) Yes, the sequence is Leu—Met—Arg.
B) Yes, the sequence is Asn—Tyr—Ala.
C) No, this RNA sequence could encode more than one amino acid sequence.
D) No; the sequence of amino acids in polypeptides is not related to the sequence of bases in RNA.
Which of the following was probably the first information storage molecule?
a. DNA b. RNA c. protein d. carbohydrates e. lipids
The evolutionary conversion of a structure, gene, or gene complex from one function to another was called ________ by Stephen Jay Gould and Elisabeth Vrba
Fill in the blank(s) with correct word
Most prokaryotic cells reproduce
A) by mitosis. B) sexually. C) by meiosis. D) extremely quickly. E) by binary fission.