Ribosomes are non-membrane-bound organelles essential for polypeptide synthesis. State the two classes of biological macromolecule that associate to form a ribosome.
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 a section 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 template strand | A | G | T | C | C | G | T | A | C |
|---|---|---|---|---|---|---|---|---|---|
| pre-mRNA strand |
In eukaryotic cells, the mature mRNA found in the cytoplasm is typically much shorter than the pre-mRNA from which it was transcribed in the nucleus. 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.