Which of these membranes is the richest in protein?
Correct answer: B. Inner mitochondrial membrane
- A. Nuclear membrane
- B. Inner mitochondrial membrane
- C. Endoplasmic reticulum
- D. Plasma membrane
Explanation
Option B is correct since membranes are involved in ATP production (such as the internal membranes of mitochondria and chloroplasts), approximately 75% is protein. Option A is incorrect since 'The nuclear envelope is composed of the nuclear lamina, nuclear pore complexes, and nuclear membranes. Option C is incorrect since the structure of the 'endoplasmic reticulum' is a network of membranes called cisternae and the phospholipid membrane encloses the cisternal space. Option D is incorrect since a typical 'plasma membrane' is somewhere in between, with protein accounting for about 50% of its mass.
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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