There is energy locked up in each bond Energy is released when bonds breakA glucose molecule Wastes C6H12O6 CO2 & H2O
TWO forms of energy are released from food:1. ATP (adenosine triphosphate)2. heat
ATP:can be moved about inside a cellis a store of energy inside cells ADENOSINE
What do you conclude from this experiment:A drop of glucose A drop of ATPsolution is put on solution is put on a muscle: a muscle:nothing happens it contracts Glucose by itself cannot provide the energy but ATP can.
Respiration builds ATPADP + P + energy from → ATP glucose Adenosine Phosphate Adenosinediphosphate triphosphate energy from glucose
The body can use the energy released whenATP is broken down: energy ableATP → ADP + P + to do work
Where doaerobic & anaerobic respiration occur?
Aerobic respiration occurs inside mitochondria Anaerobic respiration occurs in the cytoplasm
muscle contraction Respiration suppliesthe energy for transmission of impulses building proteins in cells cell division
Which chemical is used to test for CO2 as in exhaled air ?
RESULT: Lime water A: Lime water B: remains clear. turns milky.
CONCLUSION:Since lime water A remained clear, this indicates that all of the carbon dioxide in the original incoming air had been removed by the sodium hydroxide.Since lime water B turned milky, shows that carbon dioxide was produced by the green plant during respiration.
Anaerobic respiration occurswithout the need of oxygenin animals, plants and yeast Yeast cell
How would you modify the apparatus tokeep a constant temperature?Place flask in a water bath.
RESULT: Living yeast: The lime water turned milky. Boiled yeast: No colour change in the lime water.CONCLUSION: The living yeast respired anaerobically and released carbon dioxide. This can be concluded since the carbon dioxide turns lime water (calcium hydroxide) cloudy.
If apparatus is left for many days, no bubbles are given off. Give two reasons.1. No glucose left.2. Yeast died.
Question: SEP, 2012A biology student compared the rates offermentation of glucose and sucrosesolutions using yeast. The student set upthe apparatus above using water instead oflimewater. The time to produce 10 gasbubbles was recorded. The experimentalapparatus was first set up with glucose andthen repeated with sucrose.i) What other apparatus would the students need to obtain their results? (1) A control.
Question: SEP, 2012i) Identify the solution that would give a faster rate of reaction and give ONE reason for your answer. (4) Glucose. Monosaccharide which is used right away. Sucrose is a disaccharide and must be first broken down into monsaccharides before used for respiration.
Question: SEP, 2010Give a biological explanation for each ofthe following statements:Lactic acid builds up in muscle cells afterheavy exercise. (4)
Question: SEP, 2011Give a biological explanation for each ofthe following statements:The rate and depth of breathing changeduring and after exercise. (5)
Aerobic respiration Anaerobic respiration1) More energy is released Less energy is released2) Needs oxygen Oxygen is not needed3) Occurs inside Occurs in the cytoplasm mitochondria4) Glucose is completely Glucose is partially broken broken down down5) CO2 and H2O are the Wastes in yeast: waste materials CO2 & ethanol Waste in animals: lactic acid
List four ways in which respiration differs from photosynthesis.
Respiration Photosynthesis1. Occurs all the time. 1. Occurs only in light.2. Occurs in all 2. Occurs in green organisms. plants.3. Releases carbon 3. Releases oxygen dioxide.4. Uses food. 4. Builds food.
THE END It’s great to be energetic – I can study all day long!!!