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Theme A: Unity and diversity (HL)

HL-only depth on nucleic acid structure and the mechanisms and evidence behind speciation.

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Biology HLTheme A: Unity and diversity (HL)
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17 original questions · 17 derived marking activities. Teaching explanations are AI-authored; independent teacher review is pending.

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Example question and marking points

Distinguish between the structure of DNA and RNA in terms of their sugar, bases and number of strands.

  1. States that DNA contains deoxyribose sugar, while RNA contains ribose sugar.
  2. States that DNA contains the base thymine, while RNA contains uracil in its place (both share adenine, cytosine and guanine).
  3. States that DNA is typically double-stranded (a double helix), while RNA is typically single-stranded.

Check your reasoning: Compare the same three features in parallel: sugar, thymine versus uracil, and typical strand number. RNA can fold into base-paired regions even though it is usually a single strand.

Original SubjectScout practice, not an official past-paper question. Independent teacher approval is pending.

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No. These are original SubjectScout practice questions for Theme A: Unity and diversity (HL). They are not official past-paper questions or endorsed material.

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