Chapter 31

Diseases such as cancer and heart disease are not considered to be infectious diseases because they are

• too serious to be caused by germs.

• caused by viruses rather than bacteria.

• not passed from one person to another.

• unlikely to run in families.

Which scientist proposed that diseases were caused by small "animals" and not by spirits or supernatural things?

• Koch

• Pasteur

• Lister

• Salk

Which of the following best describes Koch's postulates?

• procedures that describe how to isolate a pathogen

• hypotheses that suggest germs are communicable

• conditions that prove that a pathogen causes a disease

• techniques that prevent transmission of pathogens

Which of the following could transfer a pathogen that spreads by direct contact only?

• kissing an infected person

• getting bitten by an infected mosquito

• touching an infected door knob

• breathing in an airborne pathogen

Mosquitoes infected with the protozoa that cause malaria can infect people with the protozoa through a mosquito bite. These mosquitoes are examples of

• viruses.

• pathogens

• parasites.

• vector.

Which of the following prevents pathogens from ever entering the body?

• sneezing

• immunity

• antibodies

• skin

The white blood cells that engulf pathogens that are inside of the body are

• lymphocytes.

• interferons.

• phagocytes.

• T cells.

Which cells work to destroy body cells infected by a pathogen?

• T cells

• B cells

• basophils

• phagocytes

Antibodies can make it easier for phagocytes to destroy pathogens by causing the pathogens to

• clump together.

• produce enzymes.

• burst open.

• shrivel up.

The type of immunity that is produced in response to a specific pathogen infecting your body is called

• genetic immunity.

• inherited immunity.

• active immunity.

• passive immunity.