23. The oxidation of glycolate to glyoxylate occurs in the a. chloroplast d. cyt

Question

23. The oxidation of glycolate to glyoxylate occurs in the a. chloroplast d. cytoplasm c. peroxisome b. mitochondria e. vacuole 24. The enzyme that releases CO during the photorespiratory cycle is a. glycine decarboxylase d. PEP carboxylase c. glycolate oxidase b. rubisco e. glycerate kinase as the temperature increases. c. does not change 25. The oxygenase activity of Rubisco a. increases b. decreases 26. C4 photosynthesis is so named because a. it produces a three carbon compound as the initial product of CO2 fixation b. it produces a four carbon compound as the initial product of CO2 fixation c. it produces four ATP and four NADPH molecules for carbon fixation d. there are only four steps involved in carbon fixation into carbohydrate

Explanation / Answer

23. Biosynthesis of glycolate occurs in the chloroplasts. Glycolate is oxidized in the peroxisomes to glyoxylate by the enzyme glycolate oxidase. So, the correct option is option C, Peroxisome.

24. Photorespiration is a process of plant metabolism in which ribulose 1,5-bisphosphate is oxygenated by RUBisCO enzyme. During this process of photorespiration reaction, glycine that is formed is converted to serine in the mitochondria by the enzyme glycine decarboxylase. During this process of conversion carbon dioxide is released. So, the correct option is option A, Glycine decarboxylase.

25. RUBisCO enzyme has both oxygenase and carboxylase activities. The oxygenase activity of RUBisCO enzyme occurs at low CO2 and high O2 conditions. Also, the oxygenase activity of the enzyme becomes more pronounced at higher temperatures. Therefore, the oxygenase activity of RUBisCO enzyme increases as the temperature increases. So, the correct option is option A, Increases.

26. C4 photosynthesis is so named because the initial product formed due to CO2 fixation (that is oxaloacetate) is a four carbon compound. So, the correct option is option B, It produces a four carbon compound as the initial product of CO2 fixation.

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