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OCR 21 st Century Science Unit B4 Revision Animal and Plant cells Respiration and Photosynthesis.

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Presentation on theme: "OCR 21 st Century Science Unit B4 Revision Animal and Plant cells Respiration and Photosynthesis."— Presentation transcript:

1 OCR 21 st Century Science Unit B4 Revision Animal and Plant cells Respiration and Photosynthesis

2  mitochondria contain enzymes for the reactions in aerobic respiration (in animals, plants and yeast)  cell membrane allows gases and water to pass in and out of the cell freely while presenting a barrier to other chemicals  nucleus or circular DNA in bacteria contains DNA which carries the genetic code for making enzymes used in the chemical reactions of respiration  cytoplasm where enzymes and proteins are made  chloroplasts contain chlorophyll and the enzymes for the reactions in photosynthesis Animal and Plant Cells

3 Respiration

4 Animals and plants have many uses for the energy they generate from respiration: 1)To perform the life processes, such as moving, _____ etc 2)To build up body _______ 3)To maintain a constant body ___________ (warm-blooded mammals only) 4)To build up sugars, ________ and other nutrients in plants 5)Active __________ Words – nitrates, tissue, proteins, transport, growing Uses for respiration summary

5 1) Glucose (sugar) can be used to make long chains of insoluble starch… Glucose molecules Starch molecule “Synthesis” means “making large molecules out of small ones”. Two examples: 2) Glucose can be combined with nitrates to make proteins (for growth)… Glucose molecules Proteins Synthesis

6 all living things depend on chemical reactions within cells that require energy released by respiration Respiration is a series of chemical reactions that release energy by breaking down large food molecules in all living cells Aerobic Respiration glucose + oxygen  carbon dioxide + water (+ energy released) C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O

7 All living organisms have to move, _____, reproduce etc. Each of these life processes needs ENERGY. ___________ is the process our bodies use to produce this energy: Glucose + oxygen  water + carbon dioxide + ENERGY The glucose we need comes from ______ and the oxygen from _________. Water and carbon dioxide are breathed out. The MAIN product of this equation is _________. Respiration happens in _________ in cells. Words – breathing, energy, grow, respiration, food, mitochondria Aerobic respiration summary

8 anaerobic respiration takes place in animal, plant and some microbial cells in conditions of low oxygen or absence of oxygen, to include: Anaerobic Respiration In Animal Cells: glucose  lactic acid (+ energy released) In Yeast glucose  ethanol + carbon dioxide (+ energy released) Happens in  roots in waterlogged soil  bacteria in puncture wounds  human cells during vigorous exercise

9 Unlike aerobic respiration, anaerobic respiration is when energy is provided WITHOUT needing _________: Glucose  lactic acid + a bit of energy This happens when the body can’t provide oxygen quick enough for __________ respiration to take place. Anaerobic respiration produces energy much _______ than aerobic respiration but only produces 1/20 th as much. Anaerobic respiration can also take place in other low-oxygen conditions, such as plant roots in _________ soil or bacteria in ________ wounds. Words – oxygen, aerobic, quicker, puncture, waterlogged Anaerobic respiration summary

10 4) 2) Mitochondria – contain enzymes for respiration reactions Cell Membrane – controls what comes in and out Cytoplasm - where enzymes are made Nucleus – carries genetic info for making enzymes 1) 3) In bacteria cells, this job is done by circular DNA Respiration in cells

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