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Chapter 7 Cellular respiration

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1 Chapter 7 Cellular respiration

2 “Stop and Think” pg What variable or variables affected the volume in your test tube? Provide evidence for your answer using that your team and other teams collected. 2.Yeast needs a source of food in the form of chemical energy for cellular respiration. What do you think was the source of chemical energy in the investigation? 3.Anacharis gave of the same gas in Part I Cellular Activities in Plant as the gas that was in the test tube. Where do you think the gas came from? Use what you know about the law of conservation of matter. Write your ideas down in your notebook.

3 “Stop and Think” pg Yeast was the variable that affected the volume of gas 2.Sugar was the source of chemical energy in the investigation 3.Gas did not come from the air, right? So where did it come from? The gas came from the molecules that must have been in the yeast and Anacharis.

4 Quick Review Sound Familiar? Photosynthesis Cell Analogy Project

5 Cellular Respiration Occurs in the cytosol and the mitochondria Mitochondria Cytosol: jelly like substance in the cytoplasm Mitochondria: ? "cellular power house“, they generate most of the cell's supply of (ATP), used as a source of chemical energy

6 We have the where but what is cellular respiration? Occurs within all living things plants and animals Is essential for survival Is the process of breaking down glucose for energy Wait didn’t we just make glucose in photosynthesis? All that work we did and now we are going to break it down? Yup! 6 CO H 2 O  C 6 H 12 O O 2 Look Familiar? C 6 H 12 O O 2  6 CO H 2 O + ATP Photosynthesis equation. WHOA! Mind blown? Cellular Respiration Equation

7 Can occur with or without oxygen Aerobic Respiration: Cellular respiration with oxygen Three Stages: Each stage involves a series of chemical reactions to produce ATP for energy Stages include: Glycolysis Krebs Cycle Electron Transport Chain

8 Glycolysis outline-the-process-of-glycolysis-including- phosphorylation-lysis-oxidation-and-atp-formation/ First stage aerobic respiration Occurs Cytosol Glucose: two molecules of pyruvate Rearrangement of Carbon atoms: pyruvate. ATP and NADH are produced Begin 6-Carbon Sugar Two ATP molecules transfer a phosphate to glucose Glucose: two molecules containing 3 carbons Pyruvate Glucose Two molecules of pyruvate formed Pyruvate: carbon molecule found at the end product of glycolysis Diagram modified by: Tiffany Adams INPUT OUTPUT

9 Krebs Cycle In Mitochondria 2 molecules of pyruvate enter the mitochondria Each pyruvate is converted to a two-carbon molecule Enzymes release CO 2 from pyruvate NADH & ATP produced Two more ATP molecules CO 2 NAD+ NADH CCC Pyruvate NAD+ NADHCO 2 ADP 2ATP NAD+ NADH CC Krebs Cycle INPUT OUTPUT Created by Tiffany Adams based on textbook Figure 7.11 page 324. BSCS Science: An Inquiry Approach. Colorado: Kendall Hunt, 2006

10 Electron Transport Chain Uses the NADH from previous stages ( INPUT ) NADH molecules carry the H atoms H separated: electrons & protons Electrons move from carrier to the next they release Energy Protons are pumped across the membrane (concentration gradient) this drives ATP production as protons DIFFUSE back to the mitochondria Protons diffuse are pumped thru ATP synthase (creating the most ATP ) ( OUTPUT ) End: electrons and protons join with O 2 to form H 2 O ( OUTPUT ) are-full-of-protons/

11 Anaerobic Respiration Anaerobic respiration: oxygen NOT required Glucose: pyruvate and small amount of ATP ATP production ends glycolysis Pyruvate is converted into other molecules (fermentation) Fermentation/ Lactate Net ATP =2 Anaerobic Respiration Aerobic Respiration Citric acid cycle= Krebs cycle Net ATP=36


13 Biosynthesis ATP provides energy for biosynthesis reactions in cells Biosynthesis reactions form larger, more complex molecules from less-complex molecules Such as the formation of starch from glucose Biosynthesis helps organisms to grow and maintain their structure Definition provided by definition biological production of chemical substances: the synthesis of chemical substances as the result of biological activity

14 “Stop and Think” pg Where does cellular respiration take place? 2.Why do you think it is important that plants contain mitochondria? 3.What evidence do you have that cellular respiration occurs in plant cells? Think back to your investigation of Anacharis. What gases did the plant exchange? 4.How is combustion similar to respiration? Recall that you learned about combustion of methane in the Matter Is Marvelous Unit. The reactions are shown here. 5.Compare aerobic and anaerobic respiration use a T-table or Venn diagram to list any similarities and differences between them. Combustion CH O 2 CO 2 + H 2 O + heat Cellular Respiration C 6 H O 2 6CO 2 + 6H 2 O + ATP

15 “Stop and Think” pg Inside the cells 2.Because it is where the cellular respiration takes place in plant cells as well as yeast and animal cells 3.When we saw a decrease in pH with the Anacharis. This indicates that the Anacharis can five off carbon dioxide, which is a product of cellular respiration 4.Combustion and cellular respiration both give off carbon dioxide, water, and energy. Combustion the energy is heat and in Cellular respiration the energy is ATP

16 5. Compare aerobic and anaerobic respiration use a T-table or Venn diagram to list any similarities and differences between them.

17 “Reflect and Connect” pg What functions are ATP molecules used for? 2.What role does glucose play in cellular respiration? 3.Create a concept map of the process of cellular respiration using the following words and any other words you would like to add. Remember to use verbs to connect the concepts to show relationships. Arrange the concept map so that the most universal concept is at the top. Cellular Respiration Water Carbon Dioxide ATP 4.Why is cellular respiration important to all living things, including plants? 5.What do you think the relationship is between photosynthesis and cellular respiration? Keep in mind how the reactants, products, and energy in these processes might be related the generalized equations are shown here Photosynthesis: 6 CO H 2 O  C 6 H 12 O O 2 Cellular Respiration: C 6 H 12 O O 2  6 CO H 2 O + ATP Oxygen Biosynthesis reactions Glucose

18 “Reflect and Connect” pg ATP molecules are needed for basic cell functions such as active transport across membranes and biosynthesis molecules. 2.Glucose provides the energy that is converted to ATP during cellular respiration 3.Concept map on next slide 4.Cellular respiration is important for all living things because it provides energy in the form of ATP that is necessary to carry out basic cellular processes. 5.You provide me the answers.

19 3. Concept Map Cellular Respiration Is used in Glucose O2O2 Glycolysis CO 2 H2OH2O ATP Is used in Biosynthesis reactions Gives off Is used in Gives off Krebs Cycle Electron Transport includes Anaerobic respiration Without O 2 With O 2 INPUTS OUTPUTS

20 Glycolysis Eastern Colorado Style Bennett/ Strasburg, Colorado


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