DNA and protein synthesis

4 lessons in Inheritance, variation and evolution.

22 exam questions · 43 marks

6.3 DNA and the genome DNA as a polymer of two strands in a double helix, nucleotides and complementary base pairs (A-T, C-G), how DNA is packed into chromosomes, genes as sections of DNA that code for proteins, and the genome. AQA Edexcel OCR 6 questions 6.4 Extracting DNA from fruit Edexcel: how to extract DNA from fruit such as strawberries using detergent, salt, filtering, protease and ice-cold ethanol, and why each step is needed. Edexcel 5 questions 6.5 Protein synthesis How the base sequence of a gene codes for a protein: the triplet code, transcription of DNA into mRNA in the nucleus, translation at the ribosome with carrier molecules (tRNA), and folding of the amino acid chain into a protein. Higher only Separate only AQA Edexcel OCR 6 questions 6.6 Mutations and genetic variants What mutations are, why most have no effect on the protein, how a change in a coding region can change the shape of a protein such as an enzyme, and how variants in non-coding DNA can switch genes on or off. Higher only AQA Edexcel OCR 5 questions