Cellular respiration is how cells turn the energy in glucose into ATP, the usable energy that powers life.
Cellular respiration is how cells turn the energy in glucose into ATP, the usable energy that powers life.
Explain how cells release energy from glucose and transfer that energy to ATP.
Describe the roles of glycolysis, the Krebs cycle, and electron transport in cellular respiration.
Compare aerobic cellular respiration and fermentation, including the role of oxygen and differences in energy production.
Use evidence from an investigation to explain how environmental conditions affect the rate of cellular respiration or fermentation.
Relate cellular respiration to energy use in organisms.
Trace the transfer of energy from glucose through glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation to ATP.
Explain how NADH and FADH₂ transfer energy and electrons between stages of cellular respiration.
Explain how the structure of the mitochondrion supports electron transport, chemiosmosis, and ATP synthesis.
Compare aerobic respiration and fermentation and explain how oxygen availability affects cellular energy pathways.
Collect and analyze experimental data to evaluate factors affecting cellular respiration or fermentation.
Cellular Respiration is the complement to Photosynthesis. Photosynthesis is the process by which plants make and store sugar in the presence of sunlight, and that sugar is then used by plants during respiration to produce the energy plants need to grow. Respiration can be completed in the presence of oxygen in aerobic respiration, or without oxygen in anaerobic respiration. Microbes like yeast can also break down sugar in the familiar process of fermentation.
Cellular respiration is a fundamental topic in biology, microbiology, and anatomy and physiology because it explains how cells convert glucose into usable energy in the form of ATP. Observing cellular respiration in organisms provides valuable models for hands-on investigations of metabolism and energy transfer. Cellular respiration labs, yeast fermentation experiments, seed germination investigations, and respirometer activities help students develop skills in experimental design, data analysis, and scientific communication while making connections to biotechnology, healthcare, microbiology, environmental and agricultural sciences, and biomedical research careers.
This guide breaks down the important information students need to know, provides links to products and free digital resources, and includes suggestions for hands-on labs that reinforce student understanding and support learning outcomes.
We’ve gathered a variety of products and resources to better help you teach this concept. They include:
Cells require energy to perform metabolic and cellular processes, and this includes the chemical energy stored in organic molecules like glucose. Cellular respiration transfers energy from glucose into adenosine triphosphate (ATP), the primary usable form of energy for cellular functions. ATP and adenosine diphosphate (ADP) cycle as energy is stored and released. Cellular respiration transforms both energy and matter, creating a useful connection to photosynthesis and broader cellular metabolism.
Glycolysis is the first stage of cellular respiration and the starting point for aerobic respiration and fermentation. This stage unfolds in the cytoplasm and doesn’t require oxygen as it splits a single 6-carbon glucose molecule into two 3-carbon pyruvate molecules. Some of this glucose’s energy is captured in ATP and nicotinamide adenine dinucleotide + hydrogen (NADH), with a net gain of two ATP per glucose. What happens to the pyruvate depends on oxygen availability and the organism’s metabolic pathways, creating the transition to aerobic respiration or fermentation.
Pyruvate from glycolysis enters the mitochondrion and is converted to acetyl-CoA, which enters the citric acid—also called Krebs—cycle. Carbon from glucose is released as carbon dioxide as acetyl-CoA is metabolized, and some energy is captured as ATP, while much of it is transferred to the electron carriers NADH and flavin adenine dinucleotide (FADH₂). These carriers move that energy into the electron transport chain, transitioning into the next stage of cellular respiration.
NADH and FADH₂ carry high-energy electrons from earlier stages of respiration along the electron transport chain, which is made mostly of membrane-embedded proteins. Electron transfer provides the energy ultimately used for ATP production, and ATP synthase is central to that production. This stage of cellular respiration is associated with the inner mitochondrial membrane. Oxygen is the terminal electron acceptor in aerobic respiration. This electron transport stage creates much more ATP than glycolysis or the citric acid cycle alone.
Glucose continues to break down through aerobic respiration when oxygen is available and through fermentation when it isn’t, showing how oxygen availability changes the way cells obtain usable energy. Both pathways begin with glycolysis. Aerobic respiration includes the citric acid cycle and electron transport, and it captures more energy as ATP. Fermentation regenerates molecules required by glycolysis, allowing the process to continue. Primary examples of this include alcoholic fermentation and lactic acid fermentation. Yeast fermentation produces carbon dioxide and alcohol. Some bacteria can also use molecules other than oxygen as the final electron acceptor. These pathways are called anaerobic respiration.
Cellular respiration can be investigated indirectly by measuring changes associated with the process. Oxygen consumption can be used to monitor aerobic respiration, while carbon dioxide production can be used to investigate respiration and fermentation. Respirometers can collect quantitative respiration data, and germinating and dormant seeds help compare different metabolic rates. Temperature can also be investigated as a variable affecting respiration rate. Yeast provides a system for comparing aerobic and anaerobic conditions, while different sugars and sugar concentrations can be used to investigate factors affecting fermentation. Respiration investigations naturally support understanding in experimental design, controls, measurement, graphing, rate calculations, data interpretation, and evidence-based explanations.
Investigating cellular respiration is an excellent topic for building foundational skills such as quantitative reasoning, measuring changes in volume, pH testing, calculating and comparing rates, creating and interpreting graphs, and using evidence to explain how environmental conditions affect cellular energy processes. Our lab skills series equips your students with techniques crucial to their success with free how-to videos, infographics, and classroom posters to support all learning styles. Explore our resources below.
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Build deeper understanding and comprehension of cellular respiration with hands-on activities that place key concepts at students’ fingertips.
These activities introduce students to foundations in cellular respiration, building a base for future concepts.
This kit highlights physiological differences between aerobic cellular respiration and fermentation.
Working in groups, students use molecular models to explore the energy yielding oxidation of glucose.
Students begin with the phenomenon of a fish kill that occurred in Lake Erie in late summer. Students strive to make sense of this phenomenon by gathering evidence through investigations, readings, and digital resources.
Yeasts have become increasingly important to basic biological research. Because of their rapid growth rate and ease of manipulation, certain strains of yeasts are convenient organisms for studies in physiology, genetics, cytology, and biochemistry.
These advanced activities help students build on the foundations covered in earlier lessons.
Students investigate the metabolic process of cellular respiration in germinating pea seed.
Explore the processes of photosynthesis and cellular respiration and their interrelationship using algae beads.
Using aquatic plants, students explore the processes of photosynthesis and cellular respiration by testing for the presence of carbon dioxide in water.
A simple means of encouraging and demonstrating the growth of soil microbes such as protozoa, fungi, bacteria, and algae.
Students build a deeper understanding of aerobic and anaerobic respiration with these hands-on labs.
Introduce students to the cycling of carbon from glucose to carbon dioxide in aerobic and anaerobic conditions.
The following demonstrations place aerobic cell respiration and fermentation firmly in grasp.
This activity utilizes algae beads to help students observe and connect two essential biology topics: photosynthesis and cellular respiration.
Working in groups, students use molecular models to explore the reduction of carbon dioxide to various organic molecules, which occurs during the Calvin cycle.
High-quality, detailed models are a tactile way that students can observe and explore cell structure and function. Carolina’s wide selection of models lets students learn through touch and close observation.
Engage students in hands-on labs with LabSheets, supplement your instruction with handouts and infographics, successfully incorporate living materials into lessons using care guides, gain and share scientific insights with Timeless Tips, and streamline your preparation with shopping lists and buying guides.
Wrapping up explorations in cell structure and function; membranes, diffusion, and osmosis; and cellular respiration marks a natural opportunity to assess student understanding of these key concepts with a unit test and review. Once you and your students are ready, our molecular biology page helps you dive into DNA, genetics, and more.
Need additional guidance? Our subject matter experts and customer service team are here to help you find the right activities, kits, and resources to support your goals. Reach out to us anytime at product@carolina.com.
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