Types of Pathogens

What is the name given to a biological agent that causes disease in the organism that it infects?

• vector

• pathogen

• host

• prokaryote

Viruses

• have a membrane surrounding the nucleic acid

• have DNA

• replicate asexually

• have a protein coat

Which of the following is a cellular pathogen?

• a protozoan

• a prion

• a virus

• a viroid

Which of the following pathogens has a single circular chromosome of DNA?

• fungi

• protozoa

• bacteria

• tapeworm

What is the cell wall of fungi composed of?

• murein

• cellulose

• chitin

• starch

What is the main component of the pathogenic agent known as a prion?

Viroids contain an outer protein coat

• True

• False

Which of the following pathogens is non-cellular?

• bacteria

• fungi

• prion

• mite

Which of the following is true of viruses?

• They have a cell wall made of murein

• They are unicellular

• They contain nucleic acids

• They have a coat made of carbohydrate

In June 2018, pre-cut melons were linked to food poisoning int he USA. Investigations carried out by the Centre for Disease Control and Prevention showed that several of the melons tested were positive for the prokaryote Salmonella. From this information it can be concluded that Salmonella is a:

• prion

• bacteria

• virus

• worm