In a chloroplast, the stacks of membranous sacs are called?
Grana is part of the thykaloid. Each stack of thykaloid (the individual disks) are called grana.
Cristae are those twisted, curving-shaped inner membranes in mitochondria where cellular respiration occur.
Vacuoles stores food, waste, etc.
Stroma is the fluid-like part in the chloroplast. Thykaloid is contained in the stroma.
So, are the membranous sacs called thykaloid?
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