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Module 2: Foundations in biology
Quick questions on DNA replication and the genetic code: semi-conservative replication and the triplet code - OCR A-Level Biology A
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the genetic code?Show answer
A gene is a sequence of DNA bases that codes for the amino acid sequence of a polypeptide. The code has three defining properties:
What is translating the code?Show answer
Confusing the code properties. Triplet means three bases per amino acid; degenerate means several triplets per amino acid; non-overlapping means each base is in only one triplet. Examiners deduct marks for restating the word instead of defining it.
What is q1?Show answer
State the role of DNA helicase in replication. [1 mark]
What is q2?Show answer
Explain why a base substitution in a degenerate code may not change the protein. [2 marks]
What is q3?Show answer
Name the bond formed by DNA polymerase between adjacent nucleotides. [1 mark]
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