Multiple Choice
Which organelle is the primary site of photosynthesis in plant and algal cells?
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12. Photosynthesis
Chloroplast
Multiple Choice
In chloroplasts, what is the name of the interior fluid-filled space surrounding the thylakoid membranes?
A
Thylakoid lumen
B
Intermembrane space
C
Stroma
D
Matrix
Verified step by step guidance1
Recall the structure of a chloroplast, which includes the outer membrane, inner membrane, stroma, and thylakoid membranes.
Identify that the thylakoid membranes are stacked into grana and surrounded by a fluid-filled space.
Understand that the fluid surrounding the thylakoid membranes inside the chloroplast is called the stroma.
Differentiate the stroma from other spaces such as the thylakoid lumen (inside the thylakoid), intermembrane space (between outer and inner membranes), and matrix (a term used for mitochondria, not chloroplasts).
Conclude that the correct name for the interior fluid-filled space surrounding the thylakoid membranes is the stroma.
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