Biology 251 - Genetics » Spring 2021 » Topic 7.2 Quiz

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Question #1
The bases in a DNA double helix would best be described as:
A.   planar ring structures that are hydrophilic and orientated away from the aqueous environment.
B.   planar ring structures that are hydrophobic and orientated away from the aqueous environment.
C.   planar ring structures that are hydrophilic and orientated toward the aqueous environment.
D.   planar ring structures that are hydrophobic and orientated toward the aqueous environment.
Question #2
In a DNA duplex, the bases are always paired as A with T and G with C by two hydrogen bonds.
A.   True
B.   False
Question #3
The DNA double helix can adopt different secondary structures depending on its sequence and chemical environment, but the _________ is the common structure seen for most of the DNA in any living cell.
A.   Z form
B.   B form
C.   A form
D.   circular form
E.   linear form
Question #4
In DNA, the strands are antiparallel and both strands have 5' to 3' polarity, but RNA is usually single-stranded with 3' to 5' polarity.
A.   True
B.   False
Question #5
A common modification of DNA in both bacteria and eukaryotes is:
A.   phosphorylation of bases.
B.   acetylation of bases.
C.   methylation of deoxyribose.
D.   deoxygenation of deoxyribose.
E.   methylation of bases.

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