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Gene Expression · Part 2 of 3
6 exam-style questions with model answers, plus 8 quick multi-choice questions — every question on this part of the standard, grouped by the 2 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
State where transcription and translation each take place, and name the molecule produced by each.
Explain why the cell makes an mRNA copy of a gene rather than using the DNA directly at the ribosome.
All the cells in a plant contain identical DNA, yet a leaf cell and a root cell produce different proteins. Discuss how this is possible, and explain the significance for the organism.
State the relationship between a gene and a polypeptide, and give one example each of a structural protein and a catalytic protein.
Explain how the sequence of bases in a gene determines the function of the protein it codes for.
A single base substitution in a gene changes one amino acid in the protein it codes for. In one patient this has no noticeable effect; in another, a different single-amino-acid change causes severe illness. Discuss why the consequences differ so much.