The antiparallel polarity of the two DNA strands within the double helix affects DNA replication in that
A) it takes twice as long to replicate two strands sequentially from 5? to 3?.
B) circular bacterial DNA does not have polarity, so a single strand can be copied twice.
C) DNA polymerases synthesizing both strands move in the direction of the replication fork, one strand is replicated discontinuously.
D) each portion of the double helix must be unwound twice so that both strands are replicated continuously.
C) DNA polymerases synthesizing both strands move in the direction of the replication fork, one strand is replicated discontinuously.
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The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. homology. C. convergent evolution. D. divergent evolution. E. adaptation.
The normal gene for hemoglobin was isolated, cloned in E. coli, and subjected to restriction enzyme digestion with BamHI. Following gel electrophoresis, three bands are routinely obtained
However, following the same procedure with the hemoglobin gene from an individual with sickle cell anemia, four bands are routinely obtained. These data suggest that A) the mutation associated with sickle cell anemia results in DNA that breaks easily. B) the mutation associated with sickle cell anemia results in the loss of a BamHI cut site. C) the mutation associated with sickle cell anemia results in several new enzyme cut sites for a variety of restriction enzymes. D) the mutation associated with sickle cell anemia results in the gain of a BamHI cut site. E) the assay was not performed correctly.
If your grandparents were in the F1 generation, what generation are you in?
A) F3 B) H3 C) P D) P3
Successful bacterial resistance requires interruption of one or more of the stages essential for antimicrobial action. Which of the following is NOT a mechanism of bacterial resistance?
A) Environmental factorS B) Clinical threshold tested (antibiotic strength used in testing C) CAMP positivitY D) Biological characteristics