Questions where students often pick the tempting wrong answer — make sure you know the right one:
What does 'semi-conservative' DNA replication mean?✗ One daughter molecule contains both original strands; the other contains both new strands.✓ Each new DNA molecule contains one original (parental) strand and one newly synthesised strand.
What does a gene code for?✗ A gene codes for a specific physical feature like eye colour directly.✓ Typically a polypeptide (protein) — through transcription to mRNA and translation by ribosomes.
Which activity of DNA polymerase removes a wrongly added base during replication?✗ 5' to 3' polymerase✓ 3' to 5' exonuclease
What is the role of telomerase?✗ Joins Okazaki fragments✓ Extends telomeres at chromosome ends
Where does transcription happen in a eukaryotic cell, and what is the product?✗ Transcription happens at ribosomes, where DNA is copied directly into protein.✓ In the nucleus — DNA is copied into mRNA, which then travels to the cytoplasm for translation.
Practise DNA & Gene Expression — free games
Test yourself with these quick revision games for this topic:
