Multiple Choice
What is the primary function of a chloroplast in plant and algal cells?
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12. Photosynthesis
Chloroplast
Multiple Choice
In a chloroplast, what are grana?
A
Stacks of thylakoid membranes that contain the photosynthetic machinery of the light reactions
B
The fluid-filled interior of the chloroplast where the Calvin cycle occurs
C
The chloroplast genome packaged as circular DNA within the organelle
D
The double-membrane envelope surrounding the chloroplast
Verified step by step guidance1
Understand that chloroplasts are organelles responsible for photosynthesis in plant cells and contain several distinct structures.
Recall that thylakoid membranes are the sites where the light-dependent reactions of photosynthesis take place, involving the photosynthetic machinery like photosystems and electron transport chains.
Recognize that grana are formed by stacks of these thylakoid membranes, increasing the surface area for light absorption and the efficiency of the light reactions.
Differentiate grana from other chloroplast components: the stroma (fluid-filled interior where the Calvin cycle occurs), the chloroplast genome (circular DNA), and the double-membrane envelope (outer boundary).
Conclude that grana specifically refer to the stacks of thylakoid membranes containing the photosynthetic machinery for the light reactions.
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