Living organisms obtain energy by breaking down organic molecules during cellular respiration.
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1 Section 3: Living organisms obtain energy by breaking down organic molecules during cellular respiration. K What I Know W What I Want to Find Out L What I Learned
2 Essential Questions What are the stages of cellular respiration? What is the role of electron carriers in each stage of cellular respiration? What are the similarities between alcoholic fermentation and lactic acid fermentation?
3 Vocabulary Review cyanobacterium New anaerobic process aerobic respiration aerobic process glycolysis Krebs cycle fermentation
4 Overview of Organisms obtain energy in a process called cellular respiration. Respiration harvests electrons from organic molecules and uses the energy to make ATP. The equation for cellular respiration is the opposite of the equation for photosynthesis:
5 Overview of Cellular respiration occurs in two main parts: glycolysis and aerobic respiration. Glycolysis is an anaerobic process, meaning it does not require oxygen. Aerobic respiration involves the Krebs cycle and electron transport. Aerobic processes require oxygen.
6 Glycolysis Glucose is broken down in the cytoplasm through the process of glycolysis. Two molecules of ATP and two molecules of NADH are formed for each molecule of glucose that is broken down.
7 Krebs Cycle Glycolysis has a net result of two ATP and two pyruvate. Most of the energy from the glucose is still contained in the pyruvate. In the presence of oxygen, pyruvate is transported into the mitochondrial matrix, where it is converted into carbon dioxide. The series of reactions in which pyruvate is broken down into carbon dioxide is the Krebs cycle, also know as the tricarboxylic acid (TCA) cycle.
8 Krebs Cycle Steps of the Krebs cycle Prior to the Krebs cycle, pyruvate reacts with coenzyme A (CoA) to form acetyl CoA. Acetyl CoA moves into the mitochondrial matrix. Acetyl CoA combines with a 4- carbon compound to form citric acid.
9 Krebs Cycle Steps of the Krebs cycle Citric acid is broken down releasing two molecules of carbon dioxide and generating one ATP, three NADH, and one FADH 2. Finally, acetyl CoA and citric acid are generated and the cycle continues.
10 The Krebs Cycle Animation FPO Add link to concepts animation from page 230 (Figure 13) here.
11 Electron Transport In aerobic respiration, electron transport is the final step in the breakdown of glucose. NADH and FADH 2 from the Krebs cycle are used to convert ADP to ATP. Electron transport and chemiosmosis in aerobic respiration are similar to the processes of photosynthesis.
12 Electron Transport Prokaryotic cellular respiration Some prokaryotes undergo aerobic respiration. They do not have mitochondria, so they use the cellular membrane as the location of electron transport.
13 Anaerobic Respiration When oxygen is unavailable, cells cannot follow glycolysis with the aerobic respiration (Krebs cycle and electron transport). The anaerobic process that follows glycolysis is anaerobic respiration, or fermentation. Fermentation occurs in the cytoplasm of the cell, and produces NAD + and ATP.
14 Anaerobic Respiration Lactic acid fermentation Enzymes convert the pyruvate made during glycolysis into lactic acid. Skeletal muscles produce lactic acid when the body cannot supply enough oxygen, such as during periods of strenuous exercise.
15 Anaerobic Respiration Alcohol fermentation Occurs in yeast and some bacteria Converts pyruvate into ethyl alcohol and carbon dioxide
16 Photosynthesis and
17 Energy in a Cell Virtual Lab FPO Add link to concepts in motion interactive table from page 232 here.
18 Photosynthesis & BrainPOP FPO Add link to concepts in motion interactive table from page 233 here.
19 Review Essential Questions What are the stages of cellular respiration? What is the role of electron carriers in each stage of cellular respiration? What are the similarities between alcoholic fermentation and lactic acid fermentation? Vocabulary anaerobic process aerobic respiration aerobic process glycolysis Krebs cycle fermentation
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