A) Chloroplast
B) Ribosome
C) Leucoplast
D) Nucleus
Correct Answer: B
Solution :
Ribosomes were first observed by Claude (1941) who named them 'microsomes'. Palade (1955) described them in animal cells under the electron microscope as dense particles or granules and Robert (1958) coined the term 'ribosome' They are one of the smallest organelles of the cell. During protein synthesis, many ribosomes become attached to the mRNA molecule, forming a polyribosome or polysome, which is the site for polypeptide synthesis.
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