State the two types of macromolecule from which a ribosome is constructed.
Describe the role of transfer RNA (tRNA) in the translation step of protein synthesis. Do not include transcription in your answer.
Table 1 shows the base sequence of part of a template DNA strand from a eukaryotic gene.
Complete Table 1 with the complementary base sequence of the pre-mRNA strand that would be transcribed from this DNA sequence.
Table 1
| DNA | T | A | C | G | G | C | T | T | A |
|---|---|---|---|---|---|---|---|---|---|
| pre-mRNA |
In eukaryotic cells, the mature mRNA is typically much shorter than the pre-mRNA from which it was transcribed. Explain why.
4 exam-style questions on AQA A Level Biology DNA and protein synthesis. Each one has a worked solution and a mark scheme showing where the marks go.