Multiple Choice
Which of the following best describes the effect of enzymes on chemical reactions?
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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 joining of two molecules by forming a new covalent bond, often with the hydrolysis of ATP.
B
It catalyzes the oxidation-reduction reactions between molecules.
C
It transfers functional groups from one molecule to another.
D
It catalyzes the breakdown of large molecules into smaller ones by adding water.
Verified step by step guidance1
Step 1: Understand the role of a ligase enzyme. 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: Analyze the options provided. The correct description of a ligase enzyme should match its primary function of joining two molecules with the formation of a covalent bond.
Step 3: Eliminate incorrect options. For example, the option describing oxidation-reduction reactions refers to oxidoreductases, not ligases. Similarly, the option about transferring functional groups refers to transferases, and the option about breaking down molecules with water refers to hydrolases.
Step 4: Identify the correct option. The description that matches the function of ligases is the one stating that they catalyze the joining of two molecules by forming a new covalent bond, often with the hydrolysis of ATP.
Step 5: Conclude that the correct answer is the option describing the ligase enzyme's function as catalyzing the joining of two molecules by forming a new covalent bond, often with the hydrolysis of ATP.
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