Question

Describe the differences between plant and animal cells. Be specific. How does a prokaryotic cell differ from a eukaryotic cell? Which evolved first?

Answer 1

Plant cells	Animal cells
Plant cell have fixed and rectangular shape.	The animal cell is irregular and round in shape.
A cell wall is present	A cell wall is absent
centrosome Are absent	centrosome Are present
Plastids are present  with chloroplast in them	Plastids are absent
Usually large few central vacuoles	Usually small and numerous central vacuoles

Prokaryote cells	Eukaryote cells
Nucleus absent	Nucleus present
Usually unicellular	Usually multicellular
membrane bound organelles are absent	membrane bound organelles are present

The oldest known fossilized prokaryotes were laid down approximately 3.5 billion years ago, only about 1 billion years after the formation of the Earth's crust. Eukaryotes only appear in the fossil record later, and may have formed from endosymbiosis of multiple prokaryote ancestors.