Figure 10.2 Use the following figure and the stages labeled A, B, C, D, and E to answer the following questions.

-The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?
A)The pH within the thylakoid is less than that of the stroma.
B)The pH of the stroma is higher than that of the other two measurements.
C)The pH of the stroma is higher than that of the thylakoid space but lower than that of the cytosol.
D)The pH of the thylakoid space is higher than that anywhere else in the cell.
E)There is no consistent relationship.

Question

Figure 10.2 Use the following figure and the stages labeled A, B, C, D, and E to answer the following questions.
 
-The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?
A)The pH within the thylakoid is less than that of the stroma. 
B)The pH of the stroma is higher than that of the other two measurements. 
C)The pH of the stroma is higher than that of the thylakoid space but lower than that of the cytosol. 
D)The pH of the thylakoid space is higher than that anywhere else in the cell. 
E)There is no consistent relationship.

Quizplus · Accepted Answer

The thylakoid space is the site of the proton gradient, which drives ATP synthesis during photosynthesis. Therefore, the pH within the thylakoid is expected to be lower than that of the stroma where ATP is used. The cytosol is not directly involved in photosynthesis and its pH may not be correlated with the pH in the chloroplast.

Figure 102 Use the Following Figure and the Stages Labeled A