Multiple Choice
Which graph below corresponds with a reaction that has an equilibrium constant less than 1 (Keq < 1)?
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6. Enzymes and Enzyme Kinetics
Enzymes
Struggling with Biochemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Protein kinase is an enzyme that functions in which of the following ways?
A
It catalyzes the conversion of glucose to pyruvate.
B
It transfers a phosphate group from ATP to a substrate protein.
C
It removes a phosphate group from a substrate protein.
D
It hydrolyzes peptide bonds in proteins.
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, a process known as phosphorylation.
Recognize the source of the phosphate group: Protein kinases typically transfer phosphate groups from ATP (adenosine triphosphate) to specific amino acid residues (such as serine, threonine, or tyrosine) in the substrate protein.
Clarify the function of phosphorylation: Phosphorylation can alter the activity, function, or localization of the substrate protein, playing a critical role in signal transduction and cellular regulation.
Differentiate protein kinase activity from other enzymatic functions: Protein kinases do not catalyze glucose conversion to pyruvate, remove phosphate groups (this is done by phosphatases), or hydrolyze peptide bonds (this is done by proteases).
Conclude that the correct function of protein kinase is to transfer a phosphate group from ATP to a substrate protein, as this aligns with its biochemical role in phosphorylation.
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