BIO 181 Lecture 4.5

Lecture 4.5: Krebs Cycle


Glycolysis occurs in all cells, and therefore can lay claim to being the heart of energy metabolism in all cells. However, it’s ability to transfer energy from organic compounds to ATP is very limited. Most of the available free energy that could be used to make ATP is wasted. However, when oxygen is available, and cell possess the metabolic pathways to utilize it, a great deal more energy can be extracted from compounds like glucose and used to regenerate ATP. Here, we study those metabolic pathways.


  1. Read Sections 9.3 and 9.4 of the textbook.
  2. Download Lecture 4.5 slides.
  3. Do one of the following:
    1. In-person section: Attend Lecture 4.1.
    2. Online section: Watch the following videos:
      1. Video 4.5.1, Introduction to Oxidative Metabolism.
      2. Video 4.5.2, Krebs Cycle.
  4. Complete the questions on Study Guide 4.5.


After completing the activities, log into Canvas, launch BIO 181 and complete Lecture 4.5 Quiz.

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