🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Which of the following methods is most likely to be quantitative?Answer: Dilution and plating Which of the following hint(s) suggest/s that a given specimen is likely to contain anaerobic bacteria?Answer: All of these Viable plate count can be obtained usingAnswer: both (a) and (b) In the pour plate method, the mixed culture is diluted directly in tubes ofAnswer: liquid agar medium Treponema species from human oral cavity can be selected by usingAnswer: cell size and motility When a substance is added to a solid medium which inhibits the growth of unwanted bacteria but permits the growth of wanted bacteria, it is known asAnswer: selective medium Peptone water and nutrient broth areAnswer: basal media Stuart's transport medium is used for transport of specimen containingAnswer: Neisseria gonorrhoeae Plate counts are often reported asAnswer: cfu/ml The medium which allows the growth of more than one microorganisms of interest but with morphologically distinguishable colonies is known asAnswer: differential medium Selective media facilitate growth of only one kind of organism. Saboraud medium is used to selectively isolateAnswer: yeasts Which of the following is not the characteristic of a growth curve?Answer: Each growth curve consists of four distinct phases Generation time of Escherichia coli isAnswer: 20 minutes The organism which obtain their energy from chemicals are designated asAnswer: chemotrophs Nutrient content and biological structures are considered asAnswer: intrinsic factor for microbial growth The organism which grows best above 45°C are calledAnswer: thermophilic Implicit factorsAnswer: both (a) and (b) Lag phase is also known asAnswer: period of initial adjustment Which of the following is used to grow bacterial cultures continuously?Answer: Chemostat A microbe, which grows at temperatures above 95° C is most likely to beAnswer: an archaean Some organisms can use reduced inorganic compounds as electron donors and are termed asAnswer: lithotrophs The total biomass of an organism will be determined by the nutrient present in the lowest concentration relative to the organism's requirements is a statement ofAnswer: Liebig's law of the minimum The growth is normally expressed as __________ in turbidimetric measurementAnswer: optical density Which of the following organisms typically get their carbon for biosynthesis from carbon dioxide?Answer: Aerobic, glucose-respiring bacteria (aerobic respiration) An organism that expends energy to grow in a habitat with a low water activity in order to maintain internal solute concentrations to retain water isAnswer: osmotolerant The straightforward method of binary fission explains how bacteriaAnswer: reproduce The equation used to obtain bacterial population by binary fission isAnswer: Both Bacteria and fungi multiply bestAnswer: between 16-38°C An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism isAnswer: acidophile Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?Answer: Trubidostat