EVERYDAY SCIENCE

Detailed explanation-1: -Ribosomes are the smallest cell organelles. They are not membrane bound and have important role in synthesis of proteins. They are found in both prokaryotic and eukaryotic cells.

Detailed explanation-2: -The smallest organelle is ribosome.

Detailed explanation-3: -Answer and Explanation: From largest to smallest: cell, organelle, bacteria, virus, protein, molecule, atom.

Detailed explanation-4: -Mycoplasma gallicepticum is the smallest cell. Mycoplasma’s size is 0.2–0.3 m. Mycoplasma are the smallest living organisms on the earth.