24-What is the mordant in acid- fast staining? A. Basic fachsin B. Heat C. Methy

Question

24-What is the mordant in acid- fast staining? A. Basic fachsin B. Heat C. Methylene blue D. Acid-alcohol 25- Which stain is a differential stain? A. gram stain B. capsule stain C. acid fast stain D. both a and 26-Most bacteria belong to this metabolic group A. Chemoorganotrophs B. Chemolithotrophs C. Photoheterotrophs D. None of these 27-Agar, a complex polysaccharide is isolated from A Seaweeds B. Tree barks C. Tree stem D. None of these 28-What are two commonly used isolation procedures for obtaining pure cultures A. B. C. D. Streak and pour plate Streak and loop plate Quadrant and radiant streak All of the above 29-Molds are fungi that grow in the form of multicellular filaments called A. Septa B. Hyphae C. Blastospore D. Pseudohyphae 30-Helicobacter pylori is a microaerophile that prefer to grow in A. B. C. D. No oxygen 2-10 % ofoxygen 20 % of oxygen B and C 31-Fluid thioglycollate medium (FTM) is a rich medium that supports the growth of A. B. C. D. Aerobic organisms Anacrobic organisms Both A and B None of the above 32-What is a colony? A. A mass of cells that derived from a single cell B. Cells from different species C. A and EB D. None of these

Explanation / Answer

24) The correct option is B. Heat.

Phenol/heat is mordant for acid-fast stain.

25) The correct option is A. gram stain.

Gram stain is most commonly used differential stain in bacteriology in which a decolorization step occurs between the application of two basic stains.

26) The correct option is A. chemoorganotrophs.

Most bacteria are chemoorganotrophs. Chemoorganotrophs oxidize the chemical bonds in organic compounds as their energy source.

27) The correct option is A. Seaweeds.

Agar is complex polysaccharide isolated from red algae used to solidify the media. Seaweeds are macroscopic, multicellular, marine algae. They consist red, brown and green algae.

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