Cell: The Unit of Life

Ribosomes are granular structures composed of ribonucleic acid (rRNA) and proteins, and are not surrounded by any membrane.
Prokaryotic ribosomes are 70S and eukaryotic ones are 80S; ribosomes are found in both kinds of cells.

The nucleolus is a spherical, non-membrane-bound structure in the nucleus.
It is the site of active ribosomal RNA synthesis.
Larger and more numerous nucleoli are found in cells that are actively making proteins.

E. coli is a prokaryote and Chlamydomonas is a eukaryote.
They differ in ribosomes (70S vs 80S), chromosomal organisation (naked circular DNA vs chromosomes with histones) and cell wall (peptidoglycan vs cellulose).
The cell membrane is structurally similar in both: a lipid bilayer with proteins.

The fluid mosaic model of the cell membrane was proposed by Singer and Nicolson (1972).
$Na^+$ and $K^+$ are moved by active transport (the $Na^+/K^+$ pump); in the human RBC membrane proteins are about 52 per cent; and the polar heads of the lipids face outwards while the hydrophobic tails face inwards.