What happens first in DNA replication?
a. the DNA molecule unwinds
b. DNA polymerase brings new nucleotides to
the old DNA strand
c. DNA ligase activity begins
d. hydrogen bonds are broken
e. none of these things happen first
E
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A Weil-Felix test was performed on serial dilutions from a patient bitten by a tick. The results obtained were positive for OX-19 and negative for OX-2 and OX-K. Based on these findings, the organism can be identified as:
a. R. rickettsii. b. O. tsutsugamushi. c. Rickettsia prowazekii. d. Rickettsia typhi.
The sequences in mRNA that are not translated are the ____________________. Fill in the blank(s) with the appropriate word(s)
Map units on a linkage map cannot be relied upon to calculate physical distances on a chromosome for which of the following reasons?
A) The frequency of crossing over varies along the length of the chromosome. B) The relationship between recombination frequency and map units is different in every individual. C) Physical distances between genes change during the course of the cell cycle. D) The gene order on the chromosomes is slightly different in every individual.
The bright coloration of male birds is often the result of
A) gene flow. B) genetic drift. C) sexual selection. D) stabilizing selection. E) coevolution.