Find the INCORRECT statement about Gram staining of bacteria.
Gram positive bacteria have a thick peptidoglycan layer so they are unable to retain crystal violet
Gram-positive bacteria have a thick peptidoglycan cell wall that holds the crystal violet–iodine complex, so they stay purple. Saying they are unable to retain crystal violet is incorrect.
Gram-negative bacteria have a thin peptidoglycan layer, lose the stain during decolourisation and take up the red/pink counterstain safranin, and Gram's iodine acts as the mordant that forms the complex.
Hence, Gram positive bacteria have a thick peptidoglycan layer so they are unable to retain crystal violet.
Which of the following does NOT figure among the Five Kingdom Classification proposed by RH Whittaker (1969)?
Which of the following organisms does not reproduce through spore formation?
Select the hierarchy (descending) of the taxonomic ranks using the codes given below:
A. Order
B. Genus
C. Class
D. Species
E. Family
Codes :
Mycoplasmas are different from the other prokaryotes by:
Taxonomic studies based on DNA are part of:
Nutritionally Albugo is
Litmus paper is obtained from which Lichen?