19:58
Branches on the tree of life: the biology of protists
The term "protist" covers a wide range of microscopic organisms formerly clumped into "Kingdom Protista." New molecular analyses show that the protistan lines of evolution go so far back in time they can be considered as different kingdoms of life....
17:47
Branches on the tree of life: the biology of viruses
This program examines the discovery of viruses and their structure, how viruses are studied, how they infect their hosts and how they replicate. Details are provided on the T-4 bacteriophage and retroviruses such as HIV.