Multiple Choice
Which organelle is found only in plant cells (and algae) and is responsible for photosynthesis?
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12. Photosynthesis
Chloroplast
Multiple Choice
In plant cells, how many membranes surround a chloroplast (i.e., its outer envelope)?
A
Four membranes
B
One membrane
C
Three membranes
D
Two membranes (an outer membrane and an inner membrane)
Verified step by step guidance1
Understand that a chloroplast is a type of organelle found in plant cells responsible for photosynthesis.
Recall that chloroplasts are enclosed by a double membrane system, which consists of two distinct membranes: an outer membrane and an inner membrane.
Recognize that these two membranes together form the chloroplast envelope, which separates the internal components of the chloroplast from the cytoplasm of the cell.
Note that although there are internal membrane structures inside the chloroplast (like thylakoid membranes), the question specifically asks about the membranes surrounding the chloroplast itself.
Conclude that the chloroplast is surrounded by exactly two membranes: the outer membrane and the inner membrane.
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