Understanding Pathogens and Archaea

What is a pathogen?

• A type of beneficial microorganism

• An agent that can cause disease

• A harmless microorganism

• A type of plant

Why is pathogenesis considered a bad idea for the organism?

• It destroys the host, which is the organism's habitat

• It has no effect on the organism

• It makes the organism stronger

• It helps the organism thrive

What significant discovery about life domains was made in the 1970s?

• All life is made up of bacteria

• Viruses are the most complex life forms

• Archaea were identified as a separate domain of life

• Fungi are not part of any life domain

Which of the following is NOT a known domain of life?

• Eukaryotes

• Archaea

• Viruses

• Bacteria

What condition has Methanobrevibacter smithii been linked to in germ-free mice?

• Cancer

• Heart disease

• Obesity

• Diabetes