Two proteins contain the same numbers of each type of amino acid, but the amino acids occur in a different order.
Why may the proteins have different functions?
The different sequences can cause the proteins to contain different base pairs.
The different sequences can cause the proteins to contain different phosphate groups.
The different sequences can cause the proteins to become different DNA strands.
The different sequences can cause the proteins to fold into different shapes.
44 exam-style questions on Edexcel GCSE Biology 3.2 DNA and protein synthesis, covering 3.2.1 DNA structure as a polymer, 3.2.2 Genome and gene definitions, 3.2.3 Extracting DNA from fruit, 3.2.4 Base order determines protein shape, 3.2.5 Stages of protein synthesis, 3.2.6 Non-coding DNA variants affecting phenotype, and 3.2.7 Coding DNA variants affecting phenotype. Each one has a worked solution and a mark scheme showing where the marks go.