Question

1 Viroids were first discovered in 1978. They are merely infectious single stranded DNA viral particles that primarily cause disease in plants.

A) True

B) False

2. A confirmative diagnosis of a prion disorder is based mostly on this method:

A)	24-hour serum monitoring.

B)	examination of the brain postmortem.

C)	liver biopsy.

D)	PCR testing.

3. This is one of the most common and direct routes for transmitting pathogens that cause gastrointestinal illness.

A)

air

B)

virus

C)

insects

D) water

4. Viruses contain some cellular components such as ribosomes, nuclear membranes and lysosomes.

A) True

B) False

5. Viruses that infect bacteria are called:

A)	transducing viruses

B)	poxviruses

C)	bacteriophages

D)	microphages

Answer 1

Q.1.

Answer is B: False

Because viroids are infectious pathogens which is comprised of a short circular RNA (not DNA) lacking protein coat.

Q. 2.

Answer is B: Examination of the brain postmortem

Prion diseases are clinically confirmed by the histopathological study of postmortem brain tissue.

Q. 3.

Answer is D: Water

For respiratory infection, pathogens are most commonly airbrone, but for gastrointestinal infection, food and water are most common and direct source for transmission of pathogens.

Q.4

Answer is B: False

Viruses consists of only Nucliec acid (either RNA or DNA) and capsid or protein coat, and in some virus, there is an outer membrane that covers the coat.

Q.5

Answer is C: Bacteriophages

The bacteria which is infected with virus is called as bacteriophage