B4 10 aerobic respiration

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© Oxford University Press 2011

On a whiteboards, in pairs;List as many things that you do which require energy!!!

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Aerobic respiration

Give examples of how cells use energy released in respiration, including the synthesis of polymersDescribe the role of aerobic respiration in providing energyDescribe cell structures and how they are involved in respiration

Keywords- aerobic respiration, mitochondria, polymers,

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Life processes Human activities

movement,generating body heat, producing proteinsActive transport

cooking, driving, electric lights

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Where does the energy for different processes come from?

Energy for life processes comes ultimately from sunlight, through food chains. This food needs to be broken down to release the energy in a form that the cells can use. The stage which allows the release of energy for the cells is the process of respiration.

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investigate the energy in foods by completing Activity AB4.10.1 Releasing the energy in food.

Consider the importance of correctly collecting data.

how we can’t be sure that the temperature change measurements give us a true indication of the nutritional energy value of the foods?

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Calculation formula

energy (Joules) = mass of water (g) change in temperature (°C) 4.2

Note that:1 cm3 of water has a mass of 1 gIt takes 4.2 Joules of energy to increase the temperature of 1 g of water by 1 °C.

4.2 is the specific heat capacity of water. Units are generally kJ/kg/°C but in this instance it has been factored down to J/g/°C.

* You should be able to calculate the energy in an example using this equation, and use the correct units

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the typical features of plant and animal cells; where does respiration takes place?

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Some of the reactions for respiration take place in the cell cytoplasm, and many happen inside mitochondria. This electron micrograph shows a single mitochondrion. (Magnification X 64000.).

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Structures used in respiration in plant and animal cell, draw the cells in your book and label the structures.

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The energy from respiration is used in reactions that make many different molecules. These include polymers of glucose (starch and cellulose) and proteins, fats, and oils.

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This girl is using energy for many different actions – such as processing information in her brain, moving, maintaining a constant internal environment, and growing and repairing her tissues.

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Three flasks are set up:peas previously boiled for 5 minutes and then cooled to room temperaturepeas frozen and left to warm to room temperaturepeas just have been soaked to start germination.

How will temperature show what is happening to the peas? Think about living processes- whiteboards

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The germinating peas should show an increase in temperature within the flask as respiration gives off waste heat energy.

This should also occur in the flask with the frozen peas as low temperatures do not destroy enzymes.

The peas which have been previously boiled should show no such rise in temperature, since the enzymes needed for respiration have been destroyed. Note that if there has been some contamination with the dead peas, then a temperature increase may be seen as decomposition takes place. Boiling should be sufficient to prevent this, but washing the peas with antiseptic is also an option.

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You need to be able to explain: the process of aerobic respiration is one which releases energy in foods for cell processes. Identify where it happens in cells

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HomeworkWrite out the investigationStart with a questionThink about reliabilityCome to a conclusion

Education

B4 10 aerobic respiration