CK-12 Foundation
Ck 12: Life Science: Domains of Life
[Free Registration/Login may be required to access all resource tools.] Humans are in the same domain as trees and algae. What could they possibly have in common? It is the location of their DNA inside their cells. Their cells all have a...
BiologyWise
Biology Wise: Gram Negative vs. Gram Positive Bacteria
Explains the characteristics of gram-negative and gram-positive bacteria and provides a table comparing them based on different criteria.