#1
Which of the following is true about viruses?
They require a host to reproduce
ExplanationViruses cannot replicate on their own and need a host organism.
#2
What is the genetic material of a virus?
Either DNA or RNA
ExplanationViruses can have either DNA or RNA as their genetic material.
#3
What is a bacteriophage?
A virus that infects bacteria
ExplanationBacteriophages are viruses that infect and replicate within bacteria.
#4
Which of the following is a viral disease in humans?
Hepatitis B
ExplanationHepatitis B is a viral infection affecting the liver.
#5
What is the shape of a typical virus particle?
Spherical
ExplanationMany viruses have a spherical shape, although they can vary.
#6
Which of the following is NOT a characteristic of viruses?
They can infect all types of organisms
ExplanationViruses have specific hosts and cannot infect all organisms.
#7
What is the typical size range of viruses?
100-1000 nanometers
ExplanationViruses are extremely small, typically ranging from 100 to 1000 nanometers.
#8
Which of the following is the correct definition of a virion?
A virus particle outside of a host cell
ExplanationA virion is a complete virus particle capable of infecting a host.
#9
Which of the following is NOT a method of viral transmission?
Photosynthesis
ExplanationViruses cannot transmit through photosynthesis as they are not capable of it.
#10
Which of the following is the primary function of a viral envelope?
To aid in the attachment of the virus to host cells
ExplanationThe viral envelope helps viruses attach to and enter host cells.
#11
Which viral structure is responsible for attaching to host cells?
Spike proteins
ExplanationSpike proteins on the virus's surface facilitate attachment to host cells.
#12
What is meant by the term 'viral latency'?
The ability of a virus to remain dormant in a host cell without causing symptoms
ExplanationViral latency refers to the period during which a virus remains dormant in a host without causing symptoms.
#13
What is a prion?
An infectious protein
ExplanationPrions are misfolded proteins that can cause other proteins to misfold, leading to disease.
#14
What is meant by the term 'viral tropism'?
The specific cells or tissues that a virus infects
ExplanationViral tropism refers to the preference of a virus for certain cells or tissues in an organism.
#15
Which of the following is a characteristic feature of a viroid?
It lacks a protein coat
ExplanationViroids are small, single-stranded RNA molecules that lack a protein coat.