PBS 3.1

Vaccinations are an example of:

• Innate immunity

• Acquired immunity

These components of our innate, or nonspecific, immune system are found in our nose, trachea, and lungs and work with mucus to trap foreign invaders:

• Digestive Enzymes

• Secretions

• Cilia

• Phagocytes

These components of our innate, or nonspecific, immune system are found in digestive tract and on our skin to prevent foreign invaders from attaching.

• Normal flora

• Secretions

• Cilia

• Phagocytes

The purple bacteria in this image are

• cocci.

• bacilli.

• spirilla.

The bacteria in this image are

• Gram positive.

• Gram negative.

A sudden increase in the occurrence of a disease in an area is

• an outbreak.

• endemic.

• a pandemic.

• nosocomial.

Organisms that cause infectious disease are called

• pathogens.

• hosts.

• antibodies.

• nosocomial.

What is the primary function of PBS (Phosphate Buffered Saline) in biological experiments?

• To provide nutrients to cells

• To maintain pH balance

• To act as a disinfectant

• To serve as a staining agent

Which of the following components is NOT typically found in PBS?

• Sodium chloride

• Potassium chloride

• Calcium chloride

• Sodium phosphate

PBS is often used in cell culture. What is its main role in this context?

• To promote cell growth

• To wash cells

• To provide energy to cells

• To act as a fixative