Which one of the following structures is an organelle within an organelle?
1.  Peroxisome
2.  ER
3.  Mesosome
4.  Ribosome

Subtopic:  Cell Organisation |
 68%
Level 2: 60%+
AIPMT - 2012
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The main arena of various types of activities of a cell is:

1. Plasma membrane 2. Mitochondria
3. Cytoplasm 4. Nucleus
Subtopic:  Cell Organisation |
 91%
Level 1: 80%+
AIPMT - 2010
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