Practice question
Question
Four structures are described below:
P: a single-membrane vesicle containing hydrolytic enzymes
Q: a membrane-bound space containing sap and excretory products
R: a double-membrane organelle with cristae
S: a double-membrane organelle with thylakoids
Which identification is correct?
Explanation
Lysosomes contain hydrolytic enzymes, while vacuoles contain water, sap, excretory products and other materials. Mitochondria possess inner-membrane cristae, whereas chloroplasts contain thylakoids arranged into grana.
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