Multiple Choice
Protein phosphorylation is commonly involved with which of the following processes?
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8. Respiration
Types of Phosphorylation
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What type of enzyme is responsible for adding a phosphate group to another protein?
A
Protease
B
Kinase
C
Ligase
D
Phosphatase
Verified step by step guidance1
Understand the role of each enzyme type: A protease breaks down proteins by hydrolyzing peptide bonds, a ligase joins two molecules together, a phosphatase removes phosphate groups, and a kinase adds phosphate groups.
Identify the function described in the problem: The problem asks for the enzyme responsible for adding a phosphate group to another protein.
Recall the definition of a kinase: A kinase is an enzyme that catalyzes the transfer of a phosphate group from a high-energy molecule (like ATP) to a specific substrate, often a protein.
Differentiate between kinase and phosphatase: While a kinase adds phosphate groups, a phosphatase removes them, which is the opposite function.
Conclude that the enzyme responsible for adding a phosphate group to another protein is a kinase, based on its definition and function.
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