Pathogens and the immune system

Which best compares bacterias and viruses?

• Bacterias are smaller than viruses

• Bacterias have genetic material, but viruses do not

• Bacterias cause illness, but viruses do not

• Bacterias are living organisms, but viruses are not

What is the MAIN difference between protozoa and bacteria?

• Protozoa can be unicellular and multicellular organisms and bacteria do not

• Bacteria can be found everywhere, protozoa do not

• Bacteria are prokaryotic organisms and protozoa are eukaryotes

• Bacteria cause infectious diseases, protozoa rarely does

Which most accurately describes what makes a mosquito a vector?

• A mosquito can be sick with malaria but not spread the illness

• A mosquito can carry malaria but not spread the illness

• A mosquito can spread malaria but not be sick with the illness

Which best explains how a nonliving virus is able to reproduce?

• A virus becomes living when in contact with a host organism.

• A virus infects a host organism by pulling the DNA from the cells of the host organism into itself.

• A virus infects a host organism by injecting its DNA into the cells of the host organism.

• A virus becomes living when a sufficient number of viruses invade a host organism and cause an infection.

A protein produced by B lymphocytes of the immune system that destroys pathogens is known as:

• Antigen

• Bacteria

• Antibody

• T – lymphocyte

What is the function of the immune system?

• To transport materials such as oxygen, nutrients and waste into an open wound

• To protect body against illnesses using lymphocytes only.

• To reject their own body cells

• To protect body against illnesses with the help of leukocytes.

Part of the body´s defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically at the pathogen is called:

• Protective barrier

• Inflammatory response

• Immune response

• Skin

What is the largest outer defense of the body?

• White blood cells

• Lymphocytes

• Phagocytes

• Skin

What is phagocytosis?

• When a cell eats other cells

• When a cell collapses

• When a cell releases nutrients

• When a cell sends information to another cell

Whis is NOT considered the FIRST line of defense?

• Hair

• Skin

• Mucous membrane

• T – Lymphocytes