True or false answer the questions below 20. Bacterial cultures that are older t

Question

True or false answer the questions below
20. Bacterial cultures that are older than 48 hours are more suitable for gram staining.

21. Bacteria which appear to have many shapes, rather than just one are pleomorphic.

22. The cell wall of gram positive bacteria has Teichoic acid while gram negative cell wall contains lipoteichoic acid.

23. Gram positive bacteria do not produce or have endotoxins

24. Archaea cell walls have proteins and polysaccharides while eubacterial cell walls contain disaccharides and proteins.

25. Lysozyme is not effective against gram negative bacteria

26. Toxemia is the clinical term for the capacity of pathogenic bacteria to produce poisons

Explanation / Answer

20.False: Cultures that are more than 24 hrs stain incorrectly in gram staining as they fail to hold on crystal violet dye.Gram +ve bacteria thus appear gram - ve bacteria.

21.True

22.False : Both teichoic acid and lipoteichoic acid are present in cell wall of gram positive bacteria and not gram negative bacteria.

23.True

24.True

25.True

26.False: Toxemia refers to the toxins present in blood.

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