▶️ Answer/Explanation
Testosterone is a male sex hormone that promotes the development of male secondary sexual characteristics.
- V (breast tissue development) is driven by estrogen, not testosterone.
- W (stronger muscles) is correct; testosterone promotes muscle growth.
- X (voice deepens) is correct; testosterone thickens vocal cords at puberty.
- Y (produced by pancreas) is incorrect; testosterone is produced mainly in the testes (and ovaries/adrenals), not the pancreas.
Thus, only W and X are correct for testosterone.
✅ Answer: (C)
▶️ Answer/Explanation
Antibiotics are a class of drugs specifically designed to target bacterial infections. They work by interfering with processes essential for bacterial growth and survival, such as cell wall synthesis, protein production, or DNA replication. Antibiotics are not effective against viruses because viruses have a completely different structure and life cycle. Viruses rely on host cells to reproduce, so they lack the specific bacterial targets that antibiotics act upon. Using antibiotics for viral infections (like the common cold or flu) is ineffective and contributes to antibiotic resistance. Therefore, the correct description is that antibiotics kill bacteria only.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
Antibiotics are chemicals designed to inhibit the growth of or destroy bacteria by targeting specific prokaryotic structures, such as cell walls or bacterial ribosomes. They are ineffective against viruses because viruses lack these targets and replicate inside host cells. While the body produces antibodies via white blood cells (lymphocytes) to fight infection, antibiotics are typically derived from fungi or bacteria or are synthesized artificially. Platelets are involved in blood clotting, not the production of antimicrobial substances. Therefore, the only accurate statement is that they kill bacteria.
✅ Answer: (A)
✅ Answer: (A)