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Protein synthesis in an animal cell occurs

1. only on the ribosomes present in cytosol
2. only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
3. on ribosomes present in the nucleolus as well as in cytoplasm
4. on ribosomes present in cytoplasm as well as in mitochondria

Correct answer: on ribosomes present in cytoplasm as well as in mitochondria

Solution

Protein synthesis occurs on ribosomes in the cytoplasm and also on ribosomes inside mitochondria, which have their own genetic material and translation machinery. The nucleolus makes rRNA and assembles ribosomal subunits, but it is not a site of protein synthesis.

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