Who discovered $ribosomes$ in animal cells?

$DNA$ is not found in which of the following?

Identify the relationship in the following analogy:
Eukaryotic ribosomes : $80S$ :: Prokaryotic ribosomes : ............ (in $S$)

Chloroplasts contain ......... type of ribosomes,and the surface of the endoplasmic reticulum contains ......... type of ribosomes.

Ribosomes,similar to those of bacteria,are found in

Which of the following can be seen only through an electron microscope?