Multiple Choice
Enzymatic browning occurs when cut fruits and vegetables are exposed to which substance?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which of the following best describes the primary function of a ligase enzyme?
A
It catalyzes the breakdown of large molecules into smaller ones by adding water.
B
It catalyzes the oxidation-reduction reactions between molecules.
C
It catalyzes the joining of two molecules by forming a new covalent bond, often with the hydrolysis of ATP.
D
It transfers functional groups from one molecule to another.
Verified step by step guidance1
Step 1: Begin by understanding the role of ligase enzymes. Ligases are a class of enzymes that catalyze the joining of two molecules by forming a new covalent bond. This process often requires energy, which is typically provided by the hydrolysis of ATP.
Step 2: Compare the function of ligase enzymes to the other options provided in the question. For example, enzymes that catalyze the breakdown of large molecules into smaller ones by adding water are classified as hydrolases, not ligases.
Step 3: Evaluate the option describing oxidation-reduction reactions. These reactions are catalyzed by oxidoreductases, which are distinct from ligases.
Step 4: Consider the option about transferring functional groups. Enzymes that perform this function are known as transferases, which are also different from ligases.
Step 5: Conclude that the correct description of a ligase enzyme is the one stating that it catalyzes the joining of two molecules by forming a new covalent bond, often with the hydrolysis of ATP. This matches the primary function of ligase enzymes.
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