Home
Class 12
BIOLOGY
Assertion .Gram negative bacteria do not...

Assertion .Gram negative bacteria do not retain the when washed with alcohol.
Reason . The outer face of outer membrane of Gram negative bacteria contain lipopolysaccharides a part of which is integrated with membrane lipids.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion

C

Assertion is true, but Reason is false

D

Assertion is false, but Reason is true

Text Solution

Verified by Experts

The correct Answer is:
B
Gram negative bacteria do not retain the stain when washed with alcohol as they possess a very thin layer of peptidoglycan between two membranes.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • MONERA

    ARIHANT NEET|Exercise Chapter exercises Medical entrances gallery (Collection of questions asked in NEET & various medical entrance exams)|47 Videos

  • MONERA

    ARIHANT NEET|Exercise Chapter exercises Medical entrances special format questions (Match the columns)|4 Videos

  • MINERAL NUTRITION

    ARIHANT NEET|Exercise Chapter Exercises (C) Medical Entrances gallery (Collection of questions asked in NEET & Various Medical Entrance Exams)|70 Videos

  • MORPHOLOGY OF FLOWERING PLANTS

    ARIHANT NEET|Exercise Chapter exercises C( Medical entrances gallery ( collection of questions Asked in NEET & Various Medical Entrance Exams ))|140 Videos

Similar Questions

Explore conceptually related problems

Which of the following statements is correctabout gram-negative bacteria?

The bacteria which do not retain the crystal violet of iodine stain when after washing with alcohol are included in

Knowledge Check

  • Which of the following statement is wrong about gram negative bacteria ?

    A
    Basal body of flagella contains P and S rings
    B
    Thickness of peptidoglycan layer is 8–12nm
    C
    Mesosomes are less developed than gram positive bacteria
    D
    Cell wall is usually smoot

  • Assertion Gram negative (-ve) bacteria release exotoxins and cause diseases in animals . Reason WBCs of animals get destroyed by exotoxins.

    A
    Both Assertion and Reason are true and Reason is the correct explanation of Assertion
    B
    Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion
    C
    Assertion is true, but Reason is false
    D
    Assertion is false, but Reason is true

  • Assertion:The resting membrane of the neuron exhibits polarity of charges Reason:The outer surface of the axonal membrane possesses a negative charge while its inner surface becomes positively charged.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    When outer surface of the axonal membrane possesses a positive charge while its surface is negatively charged is called

    Which sequence for generation of nerve impulse and its conduction along an axon is correct? i Outer surface of the membrane becomes negatively charged and the inner side 3 becomes positively charged ii Action potential is generated iii. The polarity of the membrane reversed and and hence depolarised iv. When a stimulus is applied on the polarised membrane, the membrane becomes freely permeable to Na^(+) v. Rapid influx of Na^(+) vi. Nerve impulse is generated vii. The sequence is repeated along the length of the axon and consequently the impulse is conducted.

    Assertion : Some bacteria have the caoacity to retain Gram stain after treatement with acid alcohol. Reason : They are known as Gram positive as they are attracted towards positive pole under influence of electric current.

    Assertion : Bacteria are prokaryotic. Reason : Bacteria do not posses true nucleus and membrane bound cell organelles.

    The statement given below describe some of the characteristic features of Gram negative bacteria. Read them carefully and mark them as True(T)/False(F). I. Peptidoglycans in the cell wall are only form 3-12% . II. They produce exotoxins. III. The examples of Gram negative bacteria are Steptomuces, Staphylococcus and Streptococcus. IV. The cell wall in these bacteria is single-layered containing techoic acid.

    Home
    Profile