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Topics in Depth

Diversity & Classification

Prokaryotic Family TreeWe want you to know that prokaryotes are diverse and we’ve got the data to back it up. A great way to demonstrate diversity is by graphing a phylogenetic tree. A phylogenet...

Germ Theory

Enter the Sci-lebritiesThere are a few people we need to celebrate for the fact that we know about prokaryotes at all. Nowadays we know that many things in the world—both good and bad—are depen...

The Postulate and the Petri Dish

In 1890, Koch developed and published a set of rules, called Koch’s Postulates, that serve as a guideline for investigating the origins of infectious disease.There are four postulates in all. We...

Adaptations to Different Environments

Prokaryotes have small genomes. The most studied prokaryote, Escherichia coli has a genome about 600 or 700 times smaller than a human genome.It makes sense, though, when we think about how many di...

Bacteria Do Things, Too

Remember symbiosis? We talk about it in another guide. It comes in three forms as follows: Mutualism. Everyone benefits. "I scratch your back, you scratch mine."   Parasitism. One species...

Diseases

In this section we’re going to take you on a miraculous journey from the sewers of London to suburban Connecticut as we explore how pathogenic bacteria spread and how they do what they do. It’s...

Sterilization

Some strains of bacteria are just born to be pathogens. An infectious dose of Salmonella, one cause of food poisoning, is less than 20 cells of bacteria. However, our skin, teeth, and guts are cove...

Cloning

In this section, we’re going to give a refresher on cloning and point out just how much of it depends upon bacteria. We’re going to make a little cloning list to point out all the ways this is...

Test Your Knowledge!

Diversity & Classification Exercises1. How many domains of life are there? What are they?2. How do archaea differ from bacteria?3. Match the outermost layer with the organism:Organism:Gram-posi...

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