Rosalind Franklin's X-Ray diffraction images taken in the 1950s most directly support which of the following claims about DNA?
A) The ratio of base pairs are constant.
B) The nucleotide sequence determines genetic information.
C) The two strands of DNA are anti-parallel
D) The basic molecular structure is a helix
Ans: D) The basic molecular structure is a helix
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Complementation studies can be performed in bacteria by
A) gene targeting. B) forming merodiploids with one copy of a bacterial gene on an F? plasmid. C) forming merodiploids with two copies of a bacterial gene on F? plasmids. D) forming diploids with two copies of the bacterial chromosome.
A __________ is a virus that infects only bacteria. Fill in the blank(s) with the appropriate word(s)
Which of the following structures gives rise to endosperm?
A. Zygote formed from the fusion of a sperm and an egg B. Triploid cell formed during double fertilization C. Inner wall of the ovary D. Cytoplasm of the megaspore E. Cytoplasm of the microspore
What cell type can the Simplexviruses infect latently?
A) B cells B) epithelial cells C) neurons D) T cells E) multiple cell types