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

Question

24-What is the mordant in acid- fast staining? A. Basic fuchsin 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 c 26-Most bacteria belong to this metabolic group B. Chemolithotrophs C. 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. Streak and pour plate B. Streak and loop plate C. Quadrant and radiant strealk D. All of the above 9-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 microacrophile that prefer to grow in A. No oxygen B. 2-10 % ofoxygen C. 20% of oxygen D. B and C 31-Fluid thioglycollate medium (FTM) is a rich medium that supports the growth of A. Aerobic organisms C. D. 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 B D. None of these

Explanation / Answer

24) The correct option is B. Heat.

Steam or heat act as a mordant in acid fast staining. It is required to drive the stain into the cell.

25) The correct option is D. both a and c.

Gram stain and Acid-fast Stains are differential stains.

26) The correct option is C. Photoheterotrophs.

The four metabolic groups are classified as Photoautotrophs, photoheterotrophs, chemoautotrophs and chemoheterotrophs.

27) The correct option is A. Seaweeds.

Agar, a complex polysaccharide, which is isolated from algae. It is used to solidify the media.Seaweeds are a group of algae.

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