MBMB 451b

Photosynthesis Quiz

 

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  1. Mitochondria and chloroplasts share each of the following characteristics EXCEPT

    the ability to create a transmembrane proton gradient.

    the ability to capture light energy through the use of specialized chlorophyll pigments.

    the presence of cytochromes, quinones and iron-sulfur proteins for electron transport.

    the presence of DNA, RNA and ribosomes for synthesis of proteins.

  2. The equation for the photosynthetic reduction of CO2 to carbohydrate can be written as indicated above. The oxygen atoms of O2 are derived from the oxygen atoms of

    H2O.

    CO2.

    (CH2O).

    H2O and CO2.

    (CH2O) and H2O.

  3. Which of the following must be added to a suspension of chloroplasts to synthesize glucose from CO2 in the dark? (Assume that all the components of the reductive pentose phosphate cycle (Calvin cycle) are present.)

    NADH and ATP

    NADH

    NADPH and ATP

    NADPH

    ATP

    Nothing needs to be added.

  4. How many molecules of ATP (or ATP equivalents) and NADPH are required to synthesize one molecule of glucose via photosynthetic CO2 fixation in plants?

    2 ATP and 1 NADPH

    3 ATP and 1 NADPH

    6 ATP and 2 NADPH

    9 ATP and 6 NADPH

    18 ATP and 12 NADPH

  5. How many molecules of ATP (or ATP equivalents) and NADPH are required to synthesize one glucose residue incorporated into starch?

    6 ATP and 2 NADPH

    9 ATP and 6 NADPH

    10 ATP and 6 NADPH

    18 ATP and 12 NADPH

    19 ATP and 12 NADPH

  6. After one complete turn of the reductive pentose phosphate cycle, where will the labeled carbon atoms from 14CO2 appear in glyceraldehyde-3-phosphate?

    C1

    C2

    C3

    On all three carbons.

  7. After one complete turn of the reductive pentose phosphate cycle, where will the labeled carbon atoms from 14CO2 appear in fructose-6-phosphate?

    C1 and C6

    C2 and C5

    C3 and C4

    C1, C2, and C3

    C4, C5, and C6

  8. After one complete turn of the reductive pentose phosphate cycle, where will the labeled carbon atoms from 14CO2 appear in erythrose-4-phosphate?

    C1 and C2

    C3 and C4

    C1

    C3

    C4

  9. How many additional ATP equivalents are required to synthesize glucose from CO2 in C4 plants than are required in C3 plants?

    2

    5

    6

    10

    12

    30

  10. The following metal ions are important to both mitochondrial and chloroplast electron transport EXCEPT

    Fe.

    Mg.

    Cu.

 

 

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