Where do light-dependent reactions occur?
a. the stroma
b. the thylakoids
c. chlorophyll
d. ferredoxin

b. the thylakoids  

Explanation:

Chlorophylls are located in chloroplasts, which organelle is the continent of photosynthesis, ie, where the two important reactions occur: photochemistry, on the thylakoid membranes and biochemistry, in the chloroplast stroma.

The pigments involved in photosynthesis are chlorophylls a and b, carotenoids and phycobilins. Chlorophyll b, carotenoids, and phycobilins constitute the so-called accessory pigments. The energy absorbed by the pigments is transferred to well-defined sites located on the thylakoids membranes, the so-called reaction centers.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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