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Metabolism: Anabolic and Catabolic Reactions Overview

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Questions and Answers

What is the purpose of allosteric effectors in enzyme regulation?

Generate phosphorylated intermediates for energy transfer
Bind to the allosteric site to inhibit enzyme function (correct)
Bind to the active site to activate enzyme function
Induce negative feedback loops in metabolic pathways

Which process involves combining a positive ∆G reaction with a negative ∆G reaction to yield a net negative ∆G for the combined reactions?

Redox reactions
Reaction coupling (correct)
Feedback inhibition
Allosteric regulation

What is the main role of NADH (or NADPH) in metabolism?

Inhibit enzymes in metabolic pathways
Promote positive ∆G reactions
Transfer high energy electrons between molecules (correct)
Generate phosphorylated intermediates

In reaction coupling, what is the primary role of ATP?

Yield a negative ∆G for coupled reactions (A) Signup and view all the answers

Which feature distinguishes anabolic reactions from catabolic reactions?

Anabolic reactions consume ATP (B) Signup and view all the answers

What is the function of negative feedback loops in metabolic pathways?

Inhibit enzymes at the beginning of a pathway (D) Signup and view all the answers

Which of the following statements accurately describes anabolic reactions?

They synthesize molecules with more bonds and store energy (B) Signup and view all the answers

According to the Second Law of Thermodynamics, what happens during any energy transformation?

Energy is lost through entropy, making it unavailable for work (D) Signup and view all the answers

What is the relationship between free energy (G) and enthalpy (H) and entropy (S)?

G = H - S (B) Signup and view all the answers

How does the change in free energy ($\Delta$G) relate to anabolic and catabolic reactions?

Positive $\Delta$G indicates an anabolic reaction, while negative $\Delta$G indicates a catabolic reaction (A) Signup and view all the answers

What is the primary role of enzymes in chemical reactions?

To reduce the activation energy of a reaction (B) Signup and view all the answers

How do enzymes interact with their substrates?

Substrates interact with enzymes at the active site, forming an enzyme-substrate complex with a close interaction through induced fit (C) Signup and view all the answers

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