All Free Biology MCQs with Answers

• A. Spring shape
• B. Rod shape
• C. Comma shape
• D. Spherical shape

Explanation: This is factual recall from the chapter of acellular life which states that TMV is a helical virus that appears rod shaped so option B is…

• A. Entry
• B. Assembly
• C. Uncoating
• D. Adsorption or Attachment

Explanation: Viral infections follow similar steps in the virus replication cycle: attachment or adsorption, penetration, uncoating, replication…

• A. Viruses have their own ribosomes for protein formation.
• B. New viral ribosomes are formed after viral DNA enters the cell.
• C. Viruses do not need ribosomes for protein formation.
• D. Viruses use the host ribosomes for their own requirements.

Explanation: Viruses are nonliving outside the host cell. When they enter the host cell they use the machinery of the host cell for their replication.

• A. Bacteria
• B. Fungi
• C. Virus
• D. Malaria

Explanation: Option A: Bacteria are single-celled organisms that can cause disease. They are not derived from the Latin word venemus.

• A. Bacterial disease
• B. Viral disease
• C. Protozoan disease
• D. Viroid disease

Explanation: a. Bacterial disease: Bacterial diseases were among the first for which effective prevention methods were developed.

• A. Hepatitis B
• B. Hepatitis A
• C. Hepatitis D
• D. Hepatitis C

Explanation: The combination of alpha interferon and ribavirin has been used in the treatment of hepatitis, particularly in the context of hepatitis C.

• A. Envelope
• B. DNA
• C. Capsid
• D. Protein Coat

Explanation: A virus' protein coat contains receptors. The virus recognizes and binds to a host cell via a receptor.

• A. Spikes
• B. Envelope
• C. Capsid
• D. DNA

Explanation: The viral envelope is often covered with glycoprotein spikes that help them to recognize the host cell.

• A. Can be crystallized
• B. No cellular respiration
• C. Mutate their genetic malerial
• D. Lack biosynthetic machinery

Explanation: Living characteristics of viruses include the ability to reproduce - but only in living host cells - and the ability to mutate.

• A. Venome
• B. Genome
• C. Virion
• D. Capsid

Explanation: The complete, mature, and infectious virus particle is known as a virion

• A. They survive for a short time
• B. Their envelope is not sensitive to sunlight
• C. They are tolerant to antibodies
• D. Envelope is derived from host

Explanation: Enveloped virus is a virus that has an outer wrapping or envelope. This envelope comes from the infected cell, or host, in a process…

• A. Venome
• B. Genome
• C. Virion
• D. Capsid

Explanation: a. Venome:"Venome" is not a recognized term in the context of virology or viruses.

• A. lysosomes
• B. lysozymes
• C. ligase
• D. both a and b

Explanation: Option A: Lysosomes are organelles found in animal cells that contain various enzymes capable of breaking down cellular waste and foreign…

• A. 162
• B. 200
• C. 234
• D. 155

Explanation: Option A: This option states that the number of capsomeres found in the herpes virus capsid is 162.

• A. Lysogenic cycle
• B. Lytic cycle
• C. Both
• D. None

Explanation: The lysogenic cycle is a type of viral replication cycle that occurs in certain types of viruses, including bacteriophages, which infect…

• A. Virulent phage
• B. Lytic phage
• C. Temperate phage
• D. Both a and b

Explanation: A and B. The phage that causes the lytic cycle is called a lytic phage or virulent phage.

• A. RNA
• B. Enzyme
• C. Protective protein coat
• D. All of these

Explanation: Viroids are small, circular, single-stranded RNA molecules that are infectious agents of plants.

• A. Protein
• B. Lipids
• C. DNA
• D. RNA

Explanation: All viruses contain genetic material (either DNA or RNA) and a protein coat, not all viruses contain lipids.

• A. Lysogenic cycle
• B. Lytic cycle
• C. Both
• D. None of the above

Explanation: The bacteriophage incorporates in the host genome in the lysogenic cycle.

• A. 150 nm
• B. 100 nm
• C. 200 nm
• D. 250 nm

Explanation: The virions are 80-100 nm in diameter, and their outer lipid envelope incorporates and displays the viral glycoproteins (Fig. 1).