Organism a is the parent and b and c are siblings
The answer is A. the substrate serves as a key to activate the enzyme.
The DNA carrying a silent mutation will have no gene expression or result on the phenotype or physical appearance of the organism. Silent mutations code for the same amino acid resulting in more genetic diversity, having a genotypic advantage, but providing no noticeable differences.
Carbohydrate are compounds of carbon, hydrogen and oxygen in which the ratio of hydrogen atoms to oxygen atoms is 2:1. A certain carbohydrate is known to be 40% carbon.