Curated OER
Hans Krebs and the Puzzle of Cellular Respiration
Spark your biology buffs' critical thinking skills by assigning these questions about Hans Krebs and his work on biochemical processes. The first question refers to a respiration lab apparatus used in class, so you will want to precede...
Curated OER
Citric Acid Review Activity
Students study the Krebs's cycle and understand the steps at a functional level. In this cellular respiration lesson students complete different stations then do a written assignment.
Curated OER
Getting Energy to Make ATP
In this cellular energy worksheet, students review the stages of cellular respiration and contrast fermentation with cellular respiration. This worksheet has 6 fill in the blank and 6 short answer questions.
Estrella Mountain Community College
Estrella Mountain: Cellular Metabolism & Fermentation
This online biology book offers a comprehensive overview of cellular metabolism and fermentation. Content includes a look at glycolysis, anaerobic pathways, and aerobic respiration.
Clackamas Community College
Clackamas Community College: Citric Acid Cycle
This is a great site on the citric acid (Krebs) cycle. Each step of the cycle is written in easy-to-understand language, accompanied with diagrams.
CK-12 Foundation
Ck 12: Krebs Cycle
[Free Registration/Login may be required to access all resource tools.] After studying the Krebs Citric Acid Cycle, students will be able to identify what happens to the product of glycolysis and explain the steps and results of the cycle.
Khan Academy
Khan Academy: Steps of Cellular Respiration
Resource walks you through the four major stages of cellular respiration which include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation and traces how they connect up to one another.
Khan Academy
Khan Academy: Regulation of Cellular Respiration
This article investigates how cellular respiration can be sped up or slowed down in response to ATP levels and other metabolic signals.
Ohio State University
Ohio State University: Respiration
Informative text is clearly written and supported by good illustrations and charts as well. A quiz is also provided at the bottom of the site.
Texas A&M University
Peer Curricula: Story Time: Hans Krebs
Read about Hans Krebs' childhood and how it influenced his interest in science. Read about the importance of mentors in his life as he did research in chemistry.
Science Struck
Science Struck: Why Is Atp an Important Molecule in Metabolism
A very detailed discussion of ATP. Looks at its structure, how it works, the reactions that take place that use it or produce it, the phosphocreatine system, glycolysis, the lactic acid cycle, aerobic respiration, the citric acid cycle,...
Kent State University
Kent State University: Krebs Cycle
This page contains diagrams and formulas for the Krebs cycle. The page has seven different catagories. The page is written by Clarke Earley, Ph.D., a chemistry professor at Kent State University.
Other
The Krebs Citric Acid Cycle Map
Great graphic for review of the Krebs, or citric acid cycles. Click on the terms for tutorial help and definitions.
Chem4kids
Chem4 Kids: Cycles Around You
There are many cycles occurring in all of the Earth's organisms, including the Earth itself. This brief page highlights some of those cycles, making readers aware of how many cycles there are, big and small.
CK-12 Foundation
Ck 12: Biology: Cellular Respiration
[Free Registration/Login may be required to access all resource tools.] An overview of cellular respiration and mitochondria.
Khan Academy
Khan Academy: The Citric Acid Cycle
The citric acid cycle (also known as the Krebs Cycle) is actually a part of the much larger process called cellular respiration, the process where your body harvests energy from the food you eat. Yes, the citric acid cycle has the same...
BiologyWise
Biology Wise: Mitochondria Functions
Describes the structure and functions of the mitochondria.