A-LevelBiologyNucleic acids and protein synthesis9700/12 · Oct/Nov 2017 · Q231 Mark
Which statements concerning DNA and RNA are correct? 1 Adenine and guanine are bases that have a double ring structure; cytosine, thymine and uracil are bases with a single ring structure. 2 An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA; DNA adenine pairs with thymine and RNA adenine pairs with uracil. 3 The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription is always according to the rule that a purine pairs with a pyrimidine. 4 The two polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
✓ Correct answer
C: 1, 3 and 4
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Nucleic acids and protein synthesis and see which topics are most likely to come up next.
Sign up free →