Semiconservative DNA replication means that
A) each daughter DNA molecule is composed of one original strand and one new strand.
B) nucleotides are constantly being recycled as cells make DNA.
C) the cell can proofread its newly synthesized DNA only part of the time.
D) the sequence of a DNA molecule is preserved as it is being replicated.
E) each strand of a double-stranded DNA molecule is replicated differently.
A
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An alteration occurs during the formation of a dikaryotic cell, such that it has twice the number of nuclei compared to a normal dikaryotic cell. Only the number of nuclei changes; the type of nuclei remains the same. This altered cell is most accurately described as having
A. two haploid nuclei. B. two diploid nuclei. C. four diploid nuclei D. has four haploid nuclei. E. two haploid nuclei and two diploid nuclei.
The immunoglobulin class that is the only one capable of crossing the placenta is ________.
A. IgA B. IgG C. IgM D. IgE E. IgD
In a pedigree, a person whose symbol is filled in and who is associated with the roman numeral II
_____. A. is affected by the trait and in the second generation B. is not affected by the trait and in the second generation C. is affected by the trait and is the second-oldest child in the family D. is not affected by the trait and is the second-oldest child in the family E. is affected by the trait and has an identical twin
The genes for purple eyes and curved wings are approximately 21 map units apart on chromosome II in Drosophila. Assume that a purple-eyed female was mated to a curved wing male and that the resulting F1 phenotypically wild-type females were mated to
purple, curved males. Of 1000 offspring, what would be the expected number of flies with purple eyes and curved wings? A) 210 B) 540 C) 790 D) 105 E) 395