BiochemistryLesson 1 of 2 in the course Cellular Respiration

Cellular Energy Transfer: Redox, ATP, and Phosphorylation

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Cells transfer energy through coordinated chemical pathways. Many of these pathways depend on electrons moving from one molecule to another in paired oxidation and reduction reactions. This lesson explains how electron transfers redistribute potential energy and how electron carriers shuttle electrons through metabolism.

An oxidation-reduction reaction, or redox reaction, involves the transfer of electrons between compounds. The two processes happen together: when one compound loses electrons, another gains them.

All flashcards

What is a redox reaction?
A reaction involving electron transfer in which oxidation and reduction occur together.
What are electron carriers?
Molecules that accept and transport high-energy electrons between compounds in biochemical pathways.
How does ATP hydrolysis support cellular work?
It converts ATP to ADP and inorganic phosphate, releasing free energy that can help power cellular work.
How does substrate-level phosphorylation produce ATP?
A phosphate group transfers directly from a pathway intermediate to ADP.
How does oxidative phosphorylation produce ATP?
It relies on chemiosmosis and produces most ATP generated during glucose catabolism.

Quiz questions

  1. What happens to a compound when it is oxidized?Answer: It loses electrons.
  2. When NAD⁺ accepts electrons from a donor, what role does NAD⁺ play in the transfer?Answer: It acts as an oxidizing agent.
  3. What are the products of ATP hydrolysis, and what happens to free energy?Answer: ADP and inorganic phosphate form, and free energy is released.
  4. What defines substrate-level phosphorylation?Answer: A pathway intermediate transfers a phosphate directly to ADP.
  5. Mitochondrial diseases can arise from mutations in which genomes?Answer: Nuclear DNA or mitochondrial DNA.

Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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