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Nucleic Acids · Paper 1 — Free Biology HL Practice Questions

1FoundationMCQStructure of DNA and RNA1 markPaper 1~2 min
A student analyses a segment of DNA. One strand has the sequence 5′-ATGC-3′5'\text{-ATGC-}3'. Which of the following correctly identifies both the complementary strand the total number of hydrogen bonds formed between the two strands?
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2FoundationMCQStructure of DNA and RNA1 markPaper 1~2 min
The sugar in RNA differs from the sugar in DNA by the presence of a hydroxyl group on the 2' carbon. Which statement correctly describes this structural difference and its consequence?
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3MasteryMCQStructure of DNA and RNA1 markPaper 1~2 min
In the Hershey–Chase experiment, two batches of bacteriophages were prepared: one labelled with 35^{35}S (incorporated into protein) and one labelled with 32^{32}P (incorporated into DNA). Each batch was used to infect E. coli, and after agitation and centrifugation, the radioactivity of the bacterial cell pellet was measured. The pellet showed high 32^{32}P activity but negligible 35^{35}S activity. Which conclusion is directly supported by this observation?
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