. Protein synthesis in an animal cell occurs
A: Only on the ribosomes present in cytosol
B: On ribosomes present in cytoplasm as well as in mitochondria
C: Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
D: On ribosomes present in the nucleolus as well as in cytoplasm
Ribosomes are the sites in the cell for protein synthesis
Ribosomes are present in different cell organelles like cytoplasm, endoplasmic reticulum, mitochondria, and nucleus
Chloroplast and mitochondria have their own DNA, RNA, and ribosomes so they are self able to synthesize protein.
Hence, option (B) is correct.