Amutation between a cytosine and a thymine is known as a ( fill in the blank using a one word answer, spelling counts).

Transition

Explanation:

Transition is a kind of mutation that occurs when a purine base is substituted by another purine base (or a pyrimidine base by another pyrimidine base).

Therefore, since cytosine and thymine are both pyrimidine bases, the mutation is known as TRANSITION

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products