Which of the following statements is/are correct?1. Viruses lack enzymes necessary for the generation of energy2. Viruses can be cultured in any synthetic medium.3. Viruses are transmitted from one organism to another by biological vectors only.Select the correct answer using the codes given below.
✓ Correct answer: a) 1 only
ExplanationViruses are microscopic infectious agents that require a host cell to reproduce.They consist of genetic material (DNA or RNA) surrounded by a protein coat (capsid).They can cause a wide range of diseases in humans, animals, and plants.Statement 1 is correct: Viruses are obligate intracellular parasites and lack the metabolic machinery, including enzymes, to generate energy.They depend entirely on their host cells for energy and replication.Statement 2 is incorrect: Viruses cannot replicate or survive in synthetic media alone.They require living host cells for replication.Common methods of culturing viruses include using cell cultures, embryonated eggs, or live animals.Statement 3 is incorrect: While some viruses are transmitted through biological vectors (e.g., mosquitoes for dengue), many are transmitted by other means such as: Respiratory droplets (e.g., influenza virus), Direct contact (e.g., herpes simplex virus), Fomites (e.g., contaminated surfaces).61
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →