Biological Classification And System Of Classification Question 296
Question: Assertion : Some bacteria have the capacity to retain Gram stain after treatment with acid alcohol. Reason : They are known as Gram positive as they are attracted towards positive pole under influence of electric current.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: C
Solution:
The cell wall of Gram-negative bacteria contains alcohol-soluble lipid, while the cell wall of Gram-positive bacteria lacks the lipids and therefore resist decolourisation and retain the primary stain, appearing violet.
Gram-negative bacteria are decolorized by organic solvents and therefore, take the counterstain, appearing red.
Gram +ve bacteria does not attracted towards positive pole under influence of electric current.
BETA
