🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

In eukaryotic cells, ribosomes areAnswer: 80S Porins are located inAnswer: the outer membrane of gram-negative bacteria Which of the following is exposed on the outer surface of a gram-negative bacterium?Answer: O-antigen of lipopolysaccharide (LPS) Which of the following does not contain protein?Answer: Lipoteichoic acid Swimming towards a chemical of bacteria is termed asAnswer: positive chemotaxis Chemically the capsule may beAnswer: either (a) or (b) Peptidoglycan is found only in the bacterialAnswer: cell wall The cell walls of Gram positive bacteria contain two modified sugar, viz. N- acetylgucosamine (NAG) and N- acetylmuramic acid (NAM). They are covalently linked byAnswer: β- 1,4-glycosidic bond Which of the following organism has sterols in their cytoplasmic membrane?Answer: Mycoplasma Name the component of flagellum.Answer: All of these The location where the bacterial chromosome concentrates is calledAnswer: nucleoid Which of the following is analogous to mesosomes of bacteria?Answer: Mitochondria of eukaryotes Which of the following has Chinese letter arrangement?Answer: Corynebacterium diphtheriae The other name for peptidoglycan isAnswer: both (a) & (b) Cyanobacteria haveAnswer: a gram-negative cell wall In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cellwall?Answer: Gram-negative bacteria Which of the following structure(s) is /are external to cell wall?Answer: All of these Which of the following may be most likely to be missing from a gram-positive bacterium?Answer: Lipopolysaccharide Which of the following is the necessary step for cultivating the microorganisms?Answer: All of the above For most bacteria, the optimum pH for growth lies betweenAnswer: 6.5-7.5 Which of the following is an abiotic elicitors?Answer: All of these Suspension cultures consist of cells and cell aggregates, growing dispersed inAnswer: liquid medium Thiobacillus thiooxidans has an optimum pH ofAnswer: 2.0-3.5 Balanced growth is defined asAnswer: cultures undergoing balanced growth while maintaining a constant chemical composition Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation ofAnswer: Microaerophillic bacteria The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength ofAnswer: 600-700nm Which of the following is not an indirect method for the measurement of cell mass?Answer: Cell dry weight Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on anAnswer: aseptic solid nutrient medium The protoplast can be used toAnswer: all of these The size of a single plant cell is usually within the range ofAnswer: 20-40μm in diameter and 100-200μm long