All Free Biology MCQs with Answers

• A. Entomology
• B. Virology
• C. Epidemiology
• D. Bacteriology

Explanation: Virology is the scientific discipline concerned with the study of the biology of viruses and viral diseases, including the distribution…

• A. Capsid
• B. Matrix protein
• C. Envelope
• D. Nuclear capsid

Explanation: Some viruses have a protein lattice underneath their envelope called matrix.

• A. 20 to 2000 times
• B. 10 to 1000 times
• C. 500 times
• D. 3000 times

Explanation: A virus ranges in size from 20-250 nanometers making them about a hundred times smaller than most bacteria.

• A. 1935
• B. 1930
• C. 1932
• D. 1920

Explanation: Tobacco mosaic virus was the first virus to be crystallized. It was achieved by Wendell Meredith Stanley in 1935 who also showed that TMV…

• A. Lytic phage
• B. Lysogenic phage
• C. The viral capsid
• D. An infectious and fully forward viral particle

Explanation: A complete mature,infectious particle having inner nucleic acid and capsid around it is called a virion.

• A. Adenovirus
• B. Pox virus
• C. Influenza virus
• D. Paramyxoviruses

Explanation: Mumps, like measles, is a disease caused by an RNA virus classified in the "Paramyxoviridae" family.

• A. DNA enveloped virus
• B. RNA enveloped virus
• C. DNA virus
• D. RNA naked virus

Explanation: HBV (Hepadna virus) virus is a DNA-enveloped virus it is the cause of hepatitis B. So, option A is accurate.

• A. They are too small
• B. They have no cell wall
• C. They lack metabolic machinery
• D. All of the options are correct

Explanation: Viruses lack metabolic machinery thus they can not replicate themselves. So, option C is accurate.

• A. DNA and RNA
• B. DNA
• C. RNA
• D. DNA or RNA

Explanation: Option D is correct. Viruses can have either DNA or RNA as their genetic material.

• A. Lytic phages
• B. Virulent phages
• C. Temprate phages
• D. None of these options is correct

Explanation: Option A; virulent bacteriophages, which immediately produce progeny and lyse the host cell.Option B: lytic phage is virulent phageOption…

• A. DNA enveloped virus
• B. RNA enveloped virus
• C. DNA virus
• D. Naked virus

Explanation: Option B is orrect. Option B is correct. a family of single-stranded RNA viruses.

• A. Influenza
• B. Smallpox
• C. Mumps and measles
• D. AIDS

Explanation: Paramyxoviruses are a group of viruses that cause diseases such as mumps and measles. All the other options are incorrect.

• A. Herpes virus
• B. Reovirus
• C. Polio virus
• D. Papillomavirus

Explanation: Among all of the above options, only herpes is an enveloped virus. All the rest are non-enveloped.

• A. genome and capsid
• B. capsid and spikes
• C. envelope and capsid
• D. capsomeres and genome

Explanation: FACTUAL RECALLThe virions are composed of a central core of nucleic acid, either DNA or RNA, which is also known as the genome and is…

• A. Icosahedral virus
• B. Naked virus
• C. Enveloped virus
• D. Bilayer virus

Explanation: a. Icosahedral virus: Icosahedral viruses have a symmetrical structure that resembles a 20-sided polyhedron.

• A. It is an individual unit of the capsid
• B. It is a viral protein for replication
• C. It is a unit of nucleic acid in viruses
• D. All of the above

Explanation: Capsomeres are tiny subunits that make up the protein coat, referred to as the capsid.

• A. 1990
• B. 1980
• C. 2001
• D. 1995

Explanation: Almost two centuries after Jenner hoped that vaccination could annihilate smallpox, the 33rd World Health Assembly declared the world free…

• A. Bacteriophages
• B. Animal viruses
• C. Plant viruses
• D. Fungal viruses

Explanation: Bacteriophages are viruses that infect bacteria. They produce the enzyme lysozyme, which causes the host bacterial cell to burst and die…

• A. 100mm to 150mm
• B. 20nm to 250nm
• C. 300nm to 3000nm
• D. 3nm to 30nm

Explanation: Viruses are pathogens, which cause diseases in animals and plants.The size of a virus ranges between 20nm-250nm in length.Hence, B is the…

• A. Hexagonal capsomeres
• B. Pentagonal capsomeres
• C. Triangular Capsomeres
• D. Both options A and B are correct

Explanation: Capsid: The coat is the outer covering of a viral particle which consists of a capsid and envelope.