Viruses: Structure, Genetics and Diseases
Learn about virus structure, genetic material (DNA/RNA), reproduction mechanisms, interferons, retroviruses, and viral diseases including measles, influenza, HIV, and herpes.
Questions
AIDS virus consists of a protein sheath and genetic material. The genetic material is _________.
- single stranded RNA filament
- double stranded RNA filament
- double stranded DNA filament
- single stranded DNA filment
- sometimes DNA sometimes RNA
The influenza virus contains ________.
- DNA
- RNA
- both DNA and RNA
- either DNA or RNA
- proteins
TMV genes are _________.
- double stranded RNA
- single stranded DNA
- double stranded DNA
- proteinaceous
- polyribonucleotides
If interferon is being produced in the body of a person, the person is most likely to be suffering from _________.
- measles
- typhoid
- malaria
- tetanus
- whooping cough
Small proteins produced by vertebrate cells naturally and in response to viral infections inhibiting viral multiplication are called as _________.
- lipoproteins
- immunoglobulins
- antibodies
- interferons
- antitoxins
Retroviruses are implicated as a cause of cancer in man because they _____.
- carry genes for reverse transcriptase
- carry single stranded RNA in their genomes
- carry cellular protooncogenes in their genomes
- may carry viral oncogenes in their genomes
- carry double stranded DNA
Which of these viruses contains a single stranded RNA molecule?
- Herpes
- Bacteriophage
- HIV
- Smallpox
- TMV
Lytic enzyme found in the virus is _________.
- ribonuclease
- reverse transcriptase
- lysozyme
- neuraminidase
- acetylcholinesterase
The enzyme called lysozyme is synthesised by __________.
- host cell of a virus under the control of its genome
- host cell of a virus under the control of viral genome
- virus under the control of its own genome
- virus under the control of the host genome
- both virus and host
Virus can be considered living because it __________.
- exhibits growth
- reproduces in host cell
- causes disease
- possesess enzymes
- responds to touch
'Contagium virus fluidum' refers to __________.
- polluted drinking water
- a fluid containing virus
- an infected drug
- a virus
- a disease
Which of the following diseases is caused by a virus?
- Typhoid
- Diptheria
- Cholera
- Herpes
- Malaria
Which statement is not true for viruses?
- Viruses are made of proteins and nucleic acids.
- Virus can multiply only in living cells.
- Viruses cannot use oxygen.
- Virus can grow in dilute sugar syrups in warm weather.
- Viruses are inert in nature.
Which of the following statements is true for virus?
- They invariably contain DNA.
- They multiply only in the host cells.
- They occur only inside bacteria.
- They are bigger than bacteria.
- Their genetic material is RNA not DNA.
Which of the following statements is correct for viruses?
- These have their own metabolic machinery.
- These are not obligate parasites.
- These possess DNA or RNA.
- These are killed by antibiotics.
- These are not destroyed by naturally occurring immunoglobulins.