Differences between Gram Positive and Gram Negative Bacteria
Trending Questions
Q. Given below is an assertion and reason.
Assertion: Gram negative bacteria do not retain the stain when washed with alcohol.
Reason: The cell wall of gram negative bacteria contains lipopolysaccharides, a part of which is integrated into membrane lipids.
Select the correct option:
A. Both assertion and reason are true with reason being the correct explanation
B. Both assertion and reason are true but reason is not correct explanation
C. Assertion is true, but reason is wrong
D. Both assertion and reason are wrong
Assertion: Gram negative bacteria do not retain the stain when washed with alcohol.
Reason: The cell wall of gram negative bacteria contains lipopolysaccharides, a part of which is integrated into membrane lipids.
Select the correct option:
A. Both assertion and reason are true with reason being the correct explanation
B. Both assertion and reason are true but reason is not correct explanation
C. Assertion is true, but reason is wrong
D. Both assertion and reason are wrong
- B
- D
- A
- C
Q.
Gram-positive bacteria stain purple because
It is sensitive to the stain
Peptidoglycan is very high
Release a purple colored product
Due to turgor pressure
Q. Highly resistance nature of endospore is due to the presence of
dipicolinic acid in exosporium
peptidoglycan in exosporium
dipicolinic acid and Ca in the cortex
dipicolinic acid and Ca in cell membrane
Q.
The most appropriate unit for measuring the size of bacteria is
Micron
Angstrom
Millimetre
Centimetre
Q. Lipopolysaccharide is an important cell wall component of the
- Gram-negative
- Acid fast bacteria
- Mycoplasmas
- Gram-positive
Q. During the Gram stain, ________ cells decolourise when alcohol is applied
- Both positive and negative
- Neither positive or negative
- Positive
- Negative
Q. Given below is an assertion and reason.
Assertion: Gram negative bacteria do not retain the stain when washed with alcohol.
Reason: The cell wall of gram negative bacteria contains lipopolysaccharides.
Select the correct alternative among the following.
Assertion: Gram negative bacteria do not retain the stain when washed with alcohol.
Reason: The cell wall of gram negative bacteria contains lipopolysaccharides.
Select the correct alternative among the following.
- Both assertion and reason are true with the reason being the correct explanation of the assertion
- Both assertion and reason are true but reason is not the correct explanation of the assertion
- Assertion is true, but reason is false
- Both assertion and reason are false
Q. Which is the most resistant structure in bacteria?
- Endospore
- Cyst
- Conidia
- Gonidia
Q. Endospore resistance is due to
- Impervious coat
- Dehydrated protoplasm
- Dipicolinic acid
- All of the above
Q. Read the assertion and reason carefully to mark the correct option in question
Assertion: Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason: The outer face of the outer membrane of gram-negative bacteria contains lipopolysaccharides, a part of which is integrated into the membrane lipids.
Assertion: Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason: The outer face of the outer membrane of gram-negative bacteria contains lipopolysaccharides, a part of which is integrated into the membrane lipids.
- If both assertion and reason are true but the reason is not the correct explanation of the assertion.
- If both assertion and reason are false.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If assertion is true but reason is false.
Q. Bacilus thuringiensis forms protein crystals which contain insecticidal protein. This protein.
- binds with epithelial cells of midgut of the insect pest ultimately killing it
- is coded by several genes including the gene cry
- is activated by acid pH of the foregut of the insect pest
- does not kill the carrier bacterium which is itself resistant to his toxin
Q. One of the following dyes cannot be used for staining chromatin material.
- Acetocarmine
- Crystal violet
- Haematoxylin
- Schiffs reagent (Feulgen stain)
Q. ............. is a partially hydrolyzed collagen with water holding capacity.
- Cellulose
- Starch
- Pectin
- Gelatin
Q. Identify the correct pair of events when temperate phages infect bacteria.
- Bacterial cell undergoes immediate lysis
- Prophages are formed
- No prophages are formed
- Bacterial cell undergoes many divisions
Q.
Gram-positive bacteria stain purple because
- The cell wall of Gram-positive bacteria is high in lipopolysaccharide
The cell wall of Gram-positive bacteria is high in peptidoglycan
There are 2 rings in the flagellar structure of the Gram-positive bacteria
All of the above
Q. Assertion :Gram-negative bacteria do not retain the stain, when washed with alcohol. Reason: The outer face of the outer membrane of Gram - negative bacteria contains lipoplysaccharides, a part of which is integrated into the membrance lipids.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
Q. Which of the following is used to remove the excess labelled fluorochromes during immunofluorescence technique?
- Dialysis
- Precipitation
- All of the above
- Adsorption to active charcoal
Q. Name the plant part which provides resistance to microbes to withstand hypotonic external media without bursting.
Q.
which stain will show ameoba and paramdecium in a drop of water on a slide