OCR A Level Biology A
OCR A Level Biology A Nucleotides and Nucleic Acids Exam Questions
Free OCR A Level Biology A exam questions on Nucleotides and Nucleic Acids, with mark schemes. Covers nucleotide structure, DNA, RNA, ATP, DNA replication and protein synthesis.
Nucleotides and Nucleic Acids exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Nucleotides and Nucleic Acids
This topic covers the molecules of inheritance.
What you need to know
- Nucleotides Phosphate, pentose sugar and base; purines and pyrimidines.
- DNA structure Double helix, antiparallel strands and complementary base pairing.
- Replication Semi-conservative replication by DNA helicase and DNA polymerase.
- Protein synthesis Transcription, mRNA, tRNA and translation; the genetic code.
Common mistakes in Nucleotides and Nucleic Acids
- Saying uracil is in DNA.
- Mixing up transcription and translation.
- Forgetting the code is degenerate.
Try three Nucleotides and Nucleic Acids exam-style questions
1. State the base pairs in DNA. (1 mark)
Show the mark scheme answer
Adenine with thymine, cytosine with guanine.
2. Explain why replication is semi-conservative. (1 mark)
Show the mark scheme answer
Each new molecule has one original strand and one new strand.
3. Describe the role of tRNA. (2 marks)
Show the mark scheme answer
Carries a specific amino acid (1) and its anticodon pairs with the codon on mRNA (1).
Nucleotides and Nucleic Acids FAQs
What does this topic cover?
Nucleotides, DNA, RNA, ATP and protein synthesis.
Which practical links here?
Extracting DNA from plant tissue.
What makes ATP useful?
It releases energy in small amounts when hydrolysed.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
