#1
Which of the following is true about the structure of viruses?
Viruses contain both DNA and RNA
Viruses are composed of a protein coat and genetic material
Viruses are larger than bacteria
Viruses can reproduce independently outside of a host cell
#2
What is the process by which a virus injects its genetic material into a host cell?
Transcription
Translation
Replication
Cellular penetration
#3
Which of the following viruses causes AIDS?
Influenza virus
Human papillomavirus
Hepatitis B virus
Human immunodeficiency virus (HIV)
#4
Which of the following is NOT a strategy for preventing viral infections?
Vaccination
Antibiotic treatment
Hand hygiene
Isolation of infected individuals
#5
Which of the following is NOT a common site of entry for respiratory viruses?
Nasal mucosa
Lungs
Gastrointestinal tract
Conjunctiva
#6
What is the function of the viral capsid?
To facilitate viral attachment to host cells
To contain and protect the viral genetic material
To release viral particles from infected cells
To regulate viral gene expression
#7
Which of the following is a zoonotic virus?
Hepatitis C virus
Ebola virus
Rotavirus
Herpes simplex virus
#8
Which of the following is NOT a type of viral genome?
Single-stranded DNA
Double-stranded RNA
Circular RNA
Positive-sense RNA
#9
What is the primary function of the viral polymerase enzyme?
To break down host cell DNA
To repair damaged viral genomes
To synthesize viral RNA or DNA
To trigger host cell apoptosis
#10
Which of the following is NOT a method of viral transmission?
Direct contact
Airborne droplets
Vector-borne transmission
Spontaneous generation
#11
Which enzyme is responsible for replicating RNA into DNA in retroviruses?
Reverse transcriptase
RNA polymerase
DNA ligase
Helicase
#12
Which of the following is a characteristic of DNA viruses?
They replicate in the cytoplasm of the host cell
They use RNA-dependent RNA polymerase for replication
They have a higher mutation rate compared to RNA viruses
Their genetic material is double-stranded
#13
What is the primary target of antiviral drugs that inhibit viral replication?
Viral envelope proteins
Host cell ribosomes
Viral polymerases or proteases
Host cell nucleus
#14
Which of the following is a feature of RNA viruses?
They are generally more stable in the environment compared to DNA viruses
They replicate their genome using host cell DNA polymerase
They have a higher fidelity during replication compared to DNA viruses
They often have segmented genomes
#15
What is the mechanism by which retroviruses integrate their genome into the host cell's DNA?
Transcription
Translation
Reverse transcription
Integration
#16
Which of the following is NOT a method of viral entry into host cells?
Endocytosis
Fusion with the host cell membrane
Phagocytosis
Exocytosis
#17
What is the primary determinant of host range for a virus?
Viral capsid structure
Viral replication machinery
Host cell surface receptors
Viral envelope composition
#18
What is the function of the viral envelope?
To protect the virus from environmental conditions
To aid in viral attachment and entry into host cells
To regulate viral gene expression
To synthesize viral proteins
#19
Which of the following is NOT a mode of viral transmission from arthropod vectors to humans?
Mosquito bites
Tick bites
Flea bites
Direct contact with infected bodily fluids
#20
What is a characteristic feature of enveloped viruses?
They lack a lipid bilayer
They are more resistant to disinfectants
They are released from the host cell through lysis
They have an outer lipid membrane derived from the host cell
#21
What is the role of neuraminidase in influenza virus infection?
Facilitates viral attachment to host cells
Promotes the fusion of viral and host cell membranes
Helps release virions from infected cells
Triggers host cell apoptosis
#22
What is a viroid?
A type of bacteriophage
A subviral particle
A naked infectious particle composed solely of RNA
A prion-like protein
#23
Which of the following is a strategy employed by viruses to evade the host immune response?
Upregulating host immune responses
Expressing host cell surface markers
Mutating surface antigens
Decreasing viral replication rates
#24
What is antigenic shift in the context of viral evolution?
Gradual accumulation of mutations over time
Exchange of genetic material between different virus strains
Transformation of a virus from RNA to DNA
The formation of viral antigenic complexes
#25
Which of the following is a mechanism by which viruses can cause cancer?
Inhibiting host cell proliferation
Promoting host cell differentiation
Inserting viral oncogenes into the host cell genome
Enhancing host immune responses