Which cell organelle is described by the following statements?
$(A)$ Granular structure.
$(B)$ First observed under an electron microscope as dense particles by $George\, Palade$.
$(C)$ Composed of $RNA$ and proteins.
$(D)$ Not surrounded by any membrane.

Which of the following is a membrane-less organelle found in both eukaryotic and prokaryotic cells?

Which one of the following elements is an important binding agent in ribosomes during protein synthesis?

From the statements given below,choose the correct option:
$A.$ The eukaryotic ribosomes are $80S$ and prokaryotic ribosomes are $70S$.
$B.$ Each ribosome has two sub-units.
$C.$ The two sub-units of $80S$ ribosome are $60S$ and $40S$,while those of $70S$ are $50S$ and $30S$.
$D.$ The two sub-units of $80S$ ribosome are $60S$ and $20S$,and those of $70S$ are $50S$ and $20S$.
$E.$ The two sub-units of $80S$ ribosome are $60S$ and $30S$,and those of $70S$ are $50S$ and $30S$.

Which of the following structures carries out a similar function in both plant and animal cells?

What are the two subunits of $70S$ ribosomes?