(a)
To predict: The way in which the noncyclic electron flow was affected in the hcef mutant plants as compared to normal Arabidopsis plants.
Introduction: A mutant of the Arabidopsis thaliana plant has been isolated by Livingston et al. This mutant plant, called the hcef plant because it has a higher flow of electrons in the cyclic process around the photosystem I.
(b)
To predict: The effect of mutation on the light-driven proton flux across the thylakoid membrane.
Introduction: A mutant of the Arabidopsis thaliana plant has been isolated by Livingston et al. This mutant plant, called the hcef plant because it has a higher flow of electrons in the cyclic process around the photosystem I.
(c)
To predict: The effect of the mutation on the activity of PSII.
Introduction: A mutant of the Arabidopsis thaliana plant has been isolated by Livingston et al. This mutant plant, called the hcef plant because it has a higher flow of electrons in the cyclic process around the photosystem I.
(d)
To predict: The enzyme which is defective in the mutant hcef plant that is causing a large increase in the level of fructose-1,6-bisphosphate in the stroma of the mutant plant.
Introduction: A mutant of the Arabidopsis thaliana plant has been isolated by Livingston et al. This mutant plant, called the hcef plant because it has a higher flow of electrons in the cyclic process around the photosystem I.
(e)
To predict: The way in which the starch synthesis in the stroma is affected in mutant hcef plants as compared to normal Arabidopsis plants.
Introduction: A mutant of the Arabidopsis thaliana plant has been isolated by Livingston et al. This mutant plant, called the hcef plant because it has a higher flow of electrons in the cyclic process around the photosystem I.
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Becker's World of the Cell (9th Edition)
- Assume that two pigments, red and bluc, mix to give the normal purple color of petunia petals. Separate biochemical pathways synthesize the two pigments, as shown in pathways I and Il in the accompanying diagram. "White" refers to compounds that are not pigments (total lack of pigment results in a white petal). Red pigment forms from a yellow intermediate that is normally at a concentration loo kow to color petals. Bluc mixed with yellow makes green. Assume that no mutations are lethal. Pathway I.. White Blue Pathway I White, Yellow Red Pathway II White, White, A third pathway, whose compoundk do not contribute pelal pigmentation, normally docs not allfect the bluc and red pathways. However, if one of its intermediates (white3) should build up in concentration, it can be converted into the ycllow intermediate of the red pathway. In the diagram, the letiers A through E represent enzymes. The enzymes' correspoonding genes, all of which are unlinked, may be symbolized by the same letters.…arrow_forwardPhotosyntheis related question (s): When protons move out of the thylakoid, are they moving up or down their concentration gradient? (From low to high concentration or from high to low concentration?) What protein(s) facilitate the transport of protons out of the thylakoid? We can write the formula for photosynthesis as follows: 6 H2O + 6 CO2 + light energy → C6H12O6 + 6 O2 How would you write a formula for the light reactions? Include ATP, ADP, NADP and NADPH as relevant? How would you write a formula for the Calvin cycle? Include ATP, ADP, NADP and NADPH as relevant.arrow_forwardMATHEMATICAL The free-energy change (G) for the oxidation of the cytochrome aa3 complex by molecular oxygen is 2102.3kJ=224.5kcal for each mole of electron pairs transferred. What is the maximum number of moles of ATP that could be produced in the process? How many moles of ATP are actually produced? What is the efficiency of the process, expressed as a percentage?arrow_forward
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