Practise UHS Punjab MDCAT Biology practice MCQs in sets of about 20 questions with instant answers and explanations. This page focuses on mixed practice sets…
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Q1. A researcher extracts sap from an infected tobacco plant and passes it through a porcelain filter. Which organism would still be present in the filtrate?
Answer: Tobacco Mosaic Virus
Q2. During the assembly of an Adenovirus particle, how many individual protein subunits or capsomeres are required to form its icosahedral capsid?
Answer: 252 capsomeres
Q3. A clinician observes a virus that acquires its outer lipid bilayer from the host cell's nuclear membrane. This characteristic is diagnostic of which viral group?
Answer: Herpes virus
Q4. In a laboratory culture of E. coli, a viral genome integrates into the bacterial chromosome and replicates along with it. What is this integrated viral DNA termed?
Answer: Prophage
Q5. A patient is diagnosed with an RNA virus that uses an enzyme to synthesize a DNA template. Which enzyme is essential for this specific viral replication?
Answer: Reverse transcriptase
Q6. Microscopic examination of a specific virus reveals a complex, brick-shaped symmetry. To which viral group does this pathogen most likely belong?
Answer: Brick-shaped
Q7. During the attachment phase of a T4 bacteriophage to an E. coli cell, which specific structure facilitates the initial recognition of the receptor sites?
Answer: Tail fibers
Q8. A child presents with symptoms of infantile paralysis. The causative agent is an RNA virus characterized by which specific morphology?
Answer: Spherical RNA virus
Q9. A blood transfusion recipient develops jaundice. Laboratory tests confirm a DNA virus that is often referred to as serum hepatitis. Which virus is this?
Answer: Hepatitis B
Q10. A patient develops painful vascular lesions in the mouth and lips. Which specific virus is the most common cause of these oral lesions?
Answer: Herpes simplex type 1
Q11. Scientists discover an infectious agent that causes scrapie in sheep but lacks any detectable nucleic acids. What is the nature of this agent?
Answer: Protein only
Q12. A plant pathologist identifies a small, circular, naked RNA molecule causing stunted growth in potatoes. What is this pathogen classified as?
Answer: Viroid
Q13. An HIV particle approaches a human T-lymphocyte. Which specific surface glycoprotein on the virus binds to the CD4 receptor of the host cell?
Answer: gp120
Q14. In 1980, the World Health Organization declared the global eradication of a specific viral disease. Which virus was the target of this successful campaign?
Answer: Smallpox virus
Q15. An elderly man develops a respiratory infection characterized by frequent changes in viral surface antigens. Which virus is known for this high mutation rate?
Answer: Influenza virus
Q16. Under stressful conditions, a lysogenic bacterial population suddenly begins to lyse. Which process triggers the transition from the lysogenic to the lytic cycle?
Answer: Induction
Q17. When comparing the size of different pathogens, which range correctly describes the typical diameter of most known viruses?
Answer: 20nm to 250nm
Q18. During the penetration stage of a T4 bacteriophage infection, which enzyme is released to weaken the bacterial cell wall?
Answer: Lysozyme
Q19. The digestion of proteins begins in the
Answer: Stomach
Q20. A patient recovers from a viral infection but remains a chronic carrier of a virus previously known as 'non-A, non-B hepatitis.' Which virus is this?
Answer: Hepatitis C
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