Multiple Choice
Which description about prokaryotic versus eukaryotic DNA replication is NOT correct?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following is a characteristic of the deoxyribose sugar found in a single nucleotide of DNA?
A
It contains a phosphate group attached to the 3' carbon.
B
It lacks an oxygen atom at the 2' carbon compared to ribose.
C
It has a methyl group at the 5' carbon.
D
It contains a double bond between the 1' and 2' carbons.
Verified step by step guidance1
Recall the structure of the sugar component in nucleotides: DNA contains deoxyribose, while RNA contains ribose.
Understand that ribose sugar has hydroxyl groups (-OH) attached to both the 2' and 3' carbons, whereas deoxyribose lacks the oxygen atom on the 2' carbon, having only a hydrogen atom there.
Recognize that the phosphate group is attached to the 5' carbon of the sugar, not the 3' carbon, so the statement about the phosphate group on the 3' carbon is incorrect.
Note that the sugar does not have a methyl group at the 5' carbon; methyl groups are found in other molecules like thymine, but not on the sugar itself.
Understand that there is no double bond between the 1' and 2' carbons in the sugar ring; the sugar is a five-membered ring with single bonds.
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