Textbook Question
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
a. Oxygen.
b. Water.
c. NAD+.
d. Pyruvate.
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8. Respiration
Types of Phosphorylation
Multiple Choice
Which protein acts as a positive regulator by phosphorylating other proteins when activated?
A
Ligase
B
Synthase
C
Phosphatase
D
Kinase
Verified step by step guidance1
Understand the role of a kinase: Kinases are enzymes that catalyze the transfer of phosphate groups from high-energy molecules like ATP to specific substrates, a process known as phosphorylation.
Recognize the function of phosphorylation: Phosphorylation is a crucial mechanism in cellular signaling and regulation, often activating or deactivating proteins and thus influencing various cellular processes.
Differentiate between the given options: Ligase is an enzyme that facilitates the joining of two molecules, Synthase is involved in synthesis reactions, and Phosphatase removes phosphate groups from proteins.
Identify the correct option: Kinase is the enzyme that acts as a positive regulator by phosphorylating other proteins, thereby modifying their activity.
Conclude the reasoning: Based on the functions of the enzymes listed, Kinase is the correct answer as it is responsible for phosphorylation, a key regulatory mechanism in cells.
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