intro
Question 1:
What is the accurate statement concerning Viroids?
Topic: Nature of Viroids
Correct Answer: A) They are single stranded RNA Particle
- Viroids are infectious agents that infect plants and consist of a short strand of circular, single-stranded RNA without a protein coat.
- They don't belong to the begomovirus family, and they don't reproduce outside of a cell.
- Therefore, the correct answer is A, "They are single stranded RNA Particle".
Question 2:
Identify how T-series bacteriophages are recognized.
Topic: Characterizing Bacteriophages
Correct Answer: C) Tadpole shape
- T-series bacteriophages, also known as T-phages, are recognized by their unique tadpole-like shape.
- Thus, the correct answer is C, "Tadpole shape".
Question 3:
Which body system is directly involved in the vaccination process?
Topic: Body Systems and Vaccination
Correct Answer: D) Immune
- Vaccination involves stimulating the immune system to provide protection against a specific disease.
- Therefore, the correct answer is D, "Immune system".
Question 4:
What does the term 'Virus' imply?
Topic: Origin of the Term Virus
Correct Answer: C) Venom
- The term 'Virus' originates from the Latin word 'Venom,' which means 'poison.'
- It is used to describe harmful entities that cause diseases in organisms.
- Therefore, the correct answer is C, "Venom".
Question 5:
Which enzyme is present within a bacteriophage?
Topic: Enzymes in Bacteriophages
Correct Answer: B) Lysozyme
- Bacteriophages are viruses that infect bacteria.
- The genes of bacteriophages encode the enzyme lysozyme, which plays a role in the lytic cycle.
- This enzyme assists in the release of virions by causing lysis of the host cells and digesting the cell wall of the host.
- Protease, urease, and dehydrogenase are not present in bacteriophages.
- Therefore, the correct answer is B, "Lysozyme".
Question 6:
What is the name of the infectious RNA particle without a protein coat?
Topic: Types of Infectious Agents
Correct Answer: A) Viroid
- Viroids are infectious agents that are smaller than any known viruses and infect plants.
- They consist of an extremely small circular RNA molecule and lack the protein coat commonly found in viruses.
- Therefore, the correct answer is A, "Viroid".
Question 7:
What makes a virus infectious?
Topic: Viral Infectivity
Correct Answer: B) Nucleic acid
- The true infectious component of a virus is its nucleic acid, which can be either DNA or RNA.
- In many viruses, the nucleic acid alone, even without its capsid, can infect cells. However, the efficiency of infection is significantly less than that of the intact virions.
- Therefore, the correct answer is B, "Nucleic acid".
MCQ 8:
What is the structural configuration of the Tobacco mosaic virus?
Topic: Structure of Tobacco Mosaic Virus
Correct Answer: C) Rod
- The Tobacco mosaic virus (TMV) is a plant-affecting virus.
- Its structure is characterized as being rod-shaped, with the virus particle being about 300 nm long.
- The rod shape is formed by 2130 identical protein subunits configured as a helix around an RNA molecule.
- Hence, the correct answer is C, "Rod".
MCQ 9:
Which disease is directly linked to the presence of Viroids?
Topic: Diseases Caused by Viroids
Correct Answer: D) Cadang-cadang disease
- Viroids are the smallest known particles capable of replicating and consist of short strands of RNA.
- Among diseases caused by Viroids, Cadang-cadang disease is notable.
- Cadang-cadang disease mainly affects coconut trees, causing leaf yellowing and tree death.
- Hence, the correct answer is D, "Cadang-cadang disease".
MCQ 10:
How can one describe the infectivity of a virus?
Topic: Viral Infectivity
Correct Answer: B) By its nucleic acid
- The infectivity of a virus is directly linked to its genetic material, which can be either DNA or RNA.
- It's the nucleic acid that, even in the absence of the protective protein coat or capsid, has the potential to infect cells.
- But the infectivity is more efficient when the nucleic acid is within the intact virions.
- Therefore, the correct answer is B, "Nucleic acid".