Immune System

An infectious disease is spread between different organisms and is caused by a(n)

• genetic mutation

• exposure to toxic chemicals

• pathogen

COVID-19 (coronavirus) is caused by a pathogen. True or false?

• TRUE

• FALSE

Noninfectious diseases are spread by microorganisms. True or false?

• TRUE

• FALSE

One of your body's first defense against an incoming pathogen is/are

• white blood cells

• your skin

• red blood cells

• antibiotics

Leukocytes are also known as red blood cells. True or false?

• TRUE

• FALSE

Phagocytes

• produce antibodies.

• consume the pathogen.

• produce antigens.

• help detect the pathogen.

What makes a virus unique?

• They have a nucleus.

• They have a cell membrane.

• They do not have DNA.

• They have no cell parts except DNA.

Viruses need to invade a cell in order to reproduce and make more of the virus. True or false?

• TRUE

• FALSE

Bacteria harm cells by

• destroying the cell and using it to make more bacteria.

• producing toxins which interfere with how the cell normally works.

COVID-19 is caused by

• bacteria.

• virus.

• a genetic mutation.

• exposure to toxic substances.