Slide 1 This question asks you to understand the organization of the photosystems in the light-dependent reactions.
Slide 2 The answer is A - the electron transport chain associated with photosystem I reduces NADP+ to NADPH. Slide 3 This image from the previous tutorial shows the arrangement of the photosystems.
Slide 4 This question asks you to understand what will happen if a photosytem becomes inefficient.
Slide 5 The answer is A - ATP production will decrease.
Slide 6 It is the electron transport chain between photosystems II and I that is responsible for producing ATP - if it becomes inefficient there will be less ATP produced.
Slide 7 This plant is completely white and has no chlorophyll - does it fix carbon dioxide?
Slide 8 The asnwer is no - this plant cannot photosynthesize because it has no chlorophyll. It is a parasite on host plants - its roots grow into the roots of trees and take sugars from the trees. It cannot produce its own sugars.
Slide 9 This question asks you to think about a plant that has an inactive Rubisco.
Slide 10 The asnwer is C - this plant will be unable to fix carbon dioxide. Rubisco is the enzyme that catalyzes the fixation of carbon dioxide to RuBP.
Slide 11 This question asks you to think about what would happen if NADPH was no longer able to become oxidized.
Slide 12 The answer is B. Remember that oxidation is a loss of electrons - this means that NADPH would be unable to donate electrons during the Calvin cycle.
Slide 13 Without the ability to receive electrons from NADPH - the reduction phase of the Calvin cycle could not occur. If you have any questions about these practice problems - please let me know.