Microbiology

The health department is trying to identify the source of an outbreak of an intestinal virus. Which is the most likely source of the virus?

• lack of exercise

• contaminated water

• polluted air

• poor nutritional habits

Which best describes fungi?

• They are nonliving, so fungal diseases are difficult to treat.

• They cause many viral diseases such as flu, AIDS and smallpox.

• They are to distinguish because they are all the same shape and size.

• They include varieties of toadstools, mushrooms, molds and yeast.

Why do some antibiotics become ineffective over time?

• because they only work for a few hours a day

• because they are overused for treatments

• because they mutate before being used

• because they only kill certain viruses

Which characteristic of bacteria allows them to evolve quickly so antibiotics become less effective?

• low mutation rate

• asexual reproduction

• single-celled

• short time between generation

Which best explains how a non-living 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

• 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.

What reason best explains why more people gets colds in colder temperatures?

• Cold temperatures cause people to stay inside, close together

• viruses need colder temperatures to survive

• viruses need colder temperatures to infect people

• colder temperatures lower a person's body temperature

The bacteria that causes bubonic plague is transmitted to humans by fleas. Which term best describes the role of the fleas in transmitting bubonic plague?

• vector

• parasite

• pathogen

• decomposer

Humans occasionally become infected with common colds and flu after flying on crowded planes. Which microscopic biological hazard is most likely responsible?

• environmental mutagens

• vector-borne parasites

• airborne contagions

• food-borne bacteria

A patient visits the doctor and is diagnosed with strep throat, which is caused by a bacteria known as streptococcus. How will the doctor treat the patient in order to stop the infectious disease?

• recommend plenty of sleep

• give a shot with a vaccine

• provide an antibiotic

The discovery on penicillin helped in the

• search for diseases

• discovery of viruses

• treatment of bacterial infections

• healing of bones