|Plant Physiology (Biology 327) - Dr. Stephen G. Saupe; College of St. Benedict/ St. John's University; Biology Department; Collegeville, MN 56321; (320) 363 - 2782; (320) 363 - 3202, fax; firstname.lastname@example.org|
Photosynthesis Quiz: Carbon Fixation
True/False Question: Answer the following questions True (T) or False (F)
_____ Rubisco is the enzyme that fixes carbon dioxide in the Calvin cycle.
_____ The Calvin cycle must turn six times and fix six carbon dioxide molecules to yield one net glucose
_____ The Calvin cycle occurs in the light.
_____ The Calvin cycle occurs in the dark
_____ The Calvin cycle requires ATP and NADPH that are supplied from the Z-scheme.
_____ There is one reduction reaction in the Calvin cycle
_____ ATP is required in one step in the Calvin Cycle
_____ During the Calvin cycle glyceraldehydes--phosphate is reduced to phosphoglyeric acid
_____ Carbon is fixed in the Calvin cycle
_____ The first stable product of carbon fixation is a three-carbon compound (PGA)
_____ Rubisco attaches carbon dioxide to a five carbon sugar (Ribulose bis phosphate)
_____ Rubisco is a substrate specific enzyme
_____ For every carbon fixed, it requires one ATP and one NADPH
_____ The product of carbon fixation in C3 plants is phosphoglyceric acid
Calvin Cycle Question: The symbols below represent intermediates (molecules) in the Calvin cycle. For example, C5 refers to a molecule that has five carbon atoms. Given the following reactions, which does NOT represent a rearrangement of carbon skeletons during the Calvin Cycle?
C5 + C1 → 2 C3
C3 + C3 → C6
C3 + C4 → C7
C7 + C3 → 2 C5
C6 + C3 → C4 + C5
C4 + C2 → C6
Classic Experimental Analysis: The three graphs below represent the results from some classic experiments in elucidating the mechanism of the carbon fixation. Provide an explain for each:
Comparison Matching Question: Match each of the following with the appropriate response
|a. C3 plant||c. CAM plant||e. C3 & CAM plants||g. all (C3, C4, CAM)|
|b. C4 plant||d. C3 & C4 plants||f. C4 & CAM plants||h. none (C3, C4, CAM)|
30. In what way are the photosynthetic adaptations of C4 and CAM plants similar?
a . neither C4 or CAM utilize thylakoids
b. both CAM and C4 make their sugar in the dark
c. both C4 and CAM plants make their sugar without using the Calvin Cycle
d. in both C4 and CAM plants, they obtain their gases at night
e. in both C4 and CAM, an enzyme other than rubisco carries out initial carbon fixation, then
the Calvin cycle is utilized later
01/07/2009 © Copyright by SG