OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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phosphate group at 5’ & OH group at 3’ end
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OH group at 5’ & phosphate group at 3’ end
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sugar at 5’ & base at 3’ end
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base at 5’ & sugar at 3’ end
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Detailed explanation-1: -Phosphate groups at the 5′ end of one nucleotide and hydroxyl groups at the 3′ end of another nucleotide can form phosphodiester bonds, connecting adjacent molecules. The sugar-phosphate backbone is provided by this linkage, which provides the structural rigidity of DNA.
Detailed explanation-2: -Bases include the pyrimidine bases (cytosine, thymine in DNA, and uracil in RNA, one ring) and the purine bases (adenine and guanine, two rings). The phosphate group is attached to the 5’ carbon.
Detailed explanation-3: -The DNA has a 5’ end and a 3’ end. The 5’ end has a phosphate group at the end while the 3’ group contains the hydroxyl group.
Detailed explanation-4: -Any single strand of DNA/RNA will always have an unbound 5’ phosphate at one end and an unbound 3’ hydroxyl group at the opposite end.