Cell structure and organization — A/L Biology

How do I practise Cell structure and organization?

1 question with a worked solution

1. Which of the following cellular structures is bounded by a single membrane and contains hydrolytic enzymes active at acidic pH?
   1. A) Lysosome
   2. B) Ribosome
   3. C) Mitochondrion
   4. D) Peroxisome
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   Correct answer: A) Lysosome

   Lysosomes are single-membrane-bound cytoplasmic organelles containing acid hydrolases (active at ~pH 4.5-5.0) responsible for intracellular digestion and autophagy.

   Show worked solution

   Step 1: Analyze organelle membrane structure: Mitochondrion (double membrane), Ribosome (non-membranous), Peroxisome (single membrane, contains catalase/oxidases), Lysosome (single membrane, acid hydrolases). Step 2: Identify enzymatic content: Hydrolytic enzymes at acidic pH = acid hydrolases in lysosomes. Answer: Lysosome.
   Modelled on: the A/L Biology examination pattern

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Where does Cell structure and organization fit in the syllabus?

Year 1 · Term 1