AP Chp HMW M6 19 Palisade cells 6-8, Photo chloroplasts and mitochondria. changes between a mitochondrion, a have both chloroplast and the cytoplasm surrounding them are shown in the figure below leafy be sealed inside a transparent container. The concentration of oxygen in the atmosphere within this container can be measured. In the dark, the oxygen concentration falls. At high light intensities. the oxygen concentration increases. At a particular light intensity, the oxygen concentration in the container remains a. Use the figure above to explain how it is possible for the oxygen concentration to remain constant. (2 points) b. Explain why there is no build up in the concentration of phosphate ions inside mitochondria as a result of the inward passage of phosphate ions. (2 points) c. Triose phosphate moves out of chloroplasts by passing through carrier proteins that are part of the chloroplast envelope. These proteins allow an inorganic phosphate ion to pass inwards at the same time as triose phosphate moves outwards. Suggest why the movement of triose phosphate out of chloroplasts is an example of facilitated diffusion (requires no ATP) rather than active transport. Hint: Enzyme comell notes first few pages) (2 points) 20. The rate of transpiration rom a plant was measured in different conditions. One of three environmental factors was varied at a time. The results are shown in the graph. factor was varired to a. Which environmental give lines X, Y & points)
Ques-19: Explain how oxygen concentration can remain constant in a plant cell.
Answer: Photolysis of water molecules in chloroplasts are going to trigger release of O2 during the light dependent reactions followed by usage of this oxygen is as final acceptor for ATP generation via oxidative phosphorylation or electron transport in mitochondria. The oxygen concentration is going to remain constant in a plant cell in the above manner and it is mediated by the “attaining a compensation point at specific light intensity”. This is mainly going to occur during equal rate of the rate of respiration and the rate of photosynthesis result in no total net alteration in the concentration of O2 in the above palisade cell.
Ques-20: Explain why there is no build up in the concentration of phosphate ions inside of the mitochondria because of an inward passage of phosphate ions.
This is because the concentration of available phosphate ions are used for the generation of ATP via oxidative phosphorylation or for the citric acid cycle consequently ATP is going to leave mitochondria. The phosphate ions are also used meticulously utilized for substrate-level phosphorylation continuously in citric acid cycle as a result no build up of phosphate ions in mitochondria
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