Bacterial Shape, Size & Structure QuizBy Medicallabstudies / June 30, 2025 Q81. Primary location of oxidative phosphorylation in bacteria is the: A) Nucleoid B) Cytoplasmic membrane C) Cell wall D) PeriplasmHint: Proton gradient is across the membrane. Q82. Which function is NOT performed by the bacterial cytoplasmic membrane? A) Active transport B) Protein synthesis C) Energy generation D) Secretion of toxinsHint: Protein synthesis occurs on ribosomes. Q83. The mesosome is best described as a(n): A) Capsular polysaccharide B) Membrane invagination involved in cell division C) Ribosomal subunit D) Peptidoglycan bridgeHint: Seen by EM as a folded membrane. Q84. Complete size of a bacterial ribosome is: A) 70S B) 80S C) 60S D) 90SHint: Distinct from eukaryotic 80S. Q85. Eukaryotic cytoplasmic ribosomes are: A) 60S B) 70S C) 80S D) 50S/30SHint: Larger 60S + 40S make 80S. Q86. Subunits of bacterial ribosomes are: A) 60S & 40S B) 50S & 30S C) 80S & 20S D) 70S & 10SHint: Target of macrolides (50S) and tetracyclines (30S). Q87. Tetracyclines inhibit protein synthesis by binding to the: A) 50S subunit B) RNA polymerase C) 30S subunit D) DNA gyraseHint: Blocks aminoacyl‑tRNA entry. Q88. Volutin (metachromatic) granules stain ____ with methylene blue. A) Blue B) Green C) Red D) BrownHint: Metachromasia produces red color. Q89. Volutin granules consist mainly of: A) Polyphosphates B) Lipids C) Glycogen D) CelluloseHint: High‑energy phosphate reserve. Q90. Identification of Corynebacterium diphtheriae relies on presence of: A) Spores B) Volutin granules C) Capsule D) Mycolic acidHint: Characteristic red inclusions. ✅ Answer Key Q81: B) Cytoplasmic membrane Q82: B) Protein synthesis Q83: B) Membrane invagination involved in cell division Q84: A) 70S Q85: C) 80S Q86: B) 50S & 30S Q87: C) 30S subunit Q88: C) Red Q89: A) Polyphosphates Q90: B) Volutin granules Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
