Multiple Choice
What determines the function of an enzyme?
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7. Energy and Metabolism
Enzymes
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A protein kinase is an enzyme that functions in which of the following ways?
A
By removing a phosphate group from a substrate
B
By synthesizing DNA from nucleotides
C
By breaking down proteins into amino acids
D
By adding a phosphate group to a substrate
Verified step by step guidance1
Understand the role of protein kinases: Protein kinases are enzymes that modify other proteins by chemically adding phosphate groups to them. This process is known as phosphorylation.
Recognize the importance of phosphorylation: Phosphorylation can activate or deactivate proteins, thereby regulating their function and activity within the cell.
Identify the substrates: Protein kinases typically target specific amino acids in proteins, such as serine, threonine, or tyrosine, to add phosphate groups.
Differentiate from other enzymes: Unlike phosphatases, which remove phosphate groups, protein kinases add phosphate groups. This is a key distinction in understanding their function.
Apply this knowledge: When asked about the function of protein kinases, remember that they are involved in adding phosphate groups to substrates, which is crucial for many cellular processes.
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