Using Light Energy to Make Organic Molecules

Review Questions

Which molecule must enter the Calvin cycle continually for the light-independent reactions to take place?

  1. RuBisCO
  2. RuBP
  3. 3-PGA
  4. CO2

Hint:

D

Which order of molecular conversions is correct for the Calvin cycle?

  1. RuBP + G3P  3-PGA  sugar
  2. RuBisCO   CO 2   RuBP  G3P
  3. RuBP + CO 2   [ RuBisCO ] 3-PGA  G3P
  4. CO 2   3-PGA  RuBP  G3P

Hint:

C

Where in eukaryotic cells does the Calvin cycle take place?

  1. thylakoid membrane
  2. thylakoid lumen
  3. chloroplast stroma
  4. granum

Hint:

C

Which statement correctly describes carbon fixation?

  1. the conversion of CO2 into an organic compound
  2. the use of RuBisCO to form 3-PGA
  3. the production of carbohydrate molecules from G3P
  4. the formation of RuBP from G3P molecules
  5. the use of ATP and NADPH to reduce CO2

Hint:

A

If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported?

  1. 4 G3P made, 1 G3P exported
  2. 4 G3P made, 2 G3P exported
  3. 8 G3P made, 1 G3P exported
  4. 8 G3P made, 4 G3P exported

Hint:

C