A gene codes for an enzyme that makes a red pigment. A non-coding DNA variant increases RNA polymerase binding. The coding sequence and all other conditions remain unchanged.
Which combination of effects is most likely?
more enzyme molecules, unchanged amino acid sequence, more red pigment
fewer enzyme molecules, changed amino acid sequence, more red pigment
more enzyme molecules, changed amino acid sequence, less red pigment
fewer enzyme molecules, unchanged amino acid sequence, less red pigment
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.