A section of the polypeptide coding for the haemoglobin β-chain contains the following amino acids. – Pro – Glu – Glu – Patients with sickle cell anaemia have mutated β-polypeptide chains. The section of the mutated polypeptide contains the following amino acids. – Pro – Val – Glu – The table shows the possible anticodons for Val. amino acid: Val, anticodon: CAA; amino acid: Val, anticodon: CAG; amino acid: Val, anticodon: CAC; amino acid: Val, anticodon: CAU. What is the corresponding DNA triplet code for the substituted amino acid in the mutated polypeptide?

A length of DNA was analysed and sequenced. 24% of its nitrogenous bases were adenine. Which percentage of the bases …

Rifampicin is an antibiotic used to treat tuberculosis (TB). It works by inhibiting RNA polymerase in bacteria. Which…

DNA molecules in a eukaryotic cell must be packaged compactly because their combined length is much greater than the …

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Structures and compounds involved in respiration include: 1 coenzyme A 2 cytoplasm 3 pyruvate 4 NAD 5 outer mitochond…

Describe the process of cyclic photophosphorylation and the structure of the photosystem involved.