#1
Which of the following is NOT a characteristic of viruses?
Ability to reproduce outside a host cell
ExplanationViruses require a host cell to replicate.
#2
Which of the following is a common method of viral transmission?
Inhalation of respiratory droplets
ExplanationRespiratory droplets are a common mode of virus transmission, especially for respiratory viruses like COVID-19.
#3
Which of the following is NOT a type of viral replication cycle?
Binary fission
ExplanationBinary fission is a method of bacterial replication, not viral replication.
#4
What is a prophage in the context of viral replication?
A viral genome integrated into the host cell's genome
ExplanationA prophage is a dormant viral genome integrated into the host DNA.
#5
Which of the following is NOT a feature of a bacteriophage?
Contains RNA as its genetic material
ExplanationBacteriophages typically contain DNA, not RNA, as their genetic material.
#6
What is the function of viral spikes?
Facilitate attachment to host cells
ExplanationViral spikes help viruses attach to specific receptors on host cells.
#7
Which of the following is NOT a method by which viruses can enter host cells?
Binary fission
ExplanationBinary fission is a method of cell division, not viral entry.
#8
What is the primary function of viral capsids?
Protect viral genetic material
ExplanationCapsids provide protection to the genetic material of viruses.
#9
Which enzyme is essential for HIV replication?
Reverse transcriptase
ExplanationReverse transcriptase converts HIV RNA into DNA for integration into the host genome.
#10
Which of the following viruses is responsible for causing chickenpox?
Varicella-zoster virus
ExplanationVaricella-zoster virus causes chickenpox and shingles.
#11
What is a retrovirus?
A virus that can integrate its genetic material into the host genome
ExplanationRetroviruses, like HIV, use reverse transcription to integrate their RNA into host DNA.
#12
Which of the following viruses causes the common cold?
Rhinovirus
ExplanationRhinoviruses are a common cause of the common cold.
#13
What is the function of a viral envelope?
Facilitates attachment to host cells
ExplanationViral envelopes contain proteins that aid in host cell attachment and entry.
#14
Which of the following is characteristic of RNA viruses?
They can undergo rapid mutation
ExplanationRNA viruses have high mutation rates, contributing to their adaptability.
#15
What is a viroid?
An infectious agent composed solely of RNA
ExplanationViroids are small, infectious RNA molecules lacking a protein coat.
#16
Which of the following is a strategy used by viruses to evade the host immune response?
Antigenic variation
ExplanationAntigenic variation involves changing surface proteins to evade immune detection.
#17
What is the name of the protein coat surrounding a virus's genetic material?
Capsid
ExplanationCapsids enclose the genetic material of viruses.
#18
Which of the following is an example of a retrovirus?
HIV
ExplanationHIV is a well-known retrovirus.
#19
Which of the following viruses is responsible for causing Ebola virus disease?
Ebola virus
ExplanationEbola virus causes severe hemorrhagic fever in humans and other primates.