Biochemistry Lecture No.1: Introduction To Cells
Thursday September 6 , 2012
Types Of Organisms & Differences:
-There are two main orders of life on Earth: Prokarya (meaning “before nucleus”) and Eukarya (meaning
-Prokaryotes are organisms that fall under the Prokarya classification and a notable example of such life
forms are bacteria.
-Eukaryotes are organisms that fall under the Eukarya classification and notable examples of such life
forms are plants, animals and fungi.
-It is important to understand that genome complexity does not necessarily correlate with the
complexity of the organism. E.g. Onion plants have a greater genome size for expression than do human
beings. However, there is a wide variation of the base pair sequences examined from organism to
-The major difference between eukaryotes and prokaryotes is the fact that eukaryotes possess a
nucleosome whereas prokaryotes do not. Prokaryotes have thick, rigid, cell walls, while eukaryotes can
either have cell walls (in the case of plants and fungi) or not (in the case of mammalian species).
-Other notable differences include eukaryotic possession of intracellular orga