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Which of the following statement is correct ?
- a)Gram negative bacteria are colored purple after Gram staining
- b)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteria
- c)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membrane
- d)Cell wall of Gram negative bacteria does not contain an outer membrane
Correct answer is option 'B'. Can you explain this answer?
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Which of the following statement is correct ?a)Gram negative bacteria ...
Understanding Gram Negative Bacteria
Gram negative bacteria are known for their distinct structural characteristics and their implications for antibiotic resistance.
Key Characteristics of Gram Negative Bacteria:
- Cell Wall Structure:
- Gram negative bacteria have a thin layer of peptidoglycan located between the inner cytoplasmic membrane and an outer membrane. This differs from Gram positive bacteria, which possess a thick layer of peptidoglycan and no outer membrane.
- Staining Properties:
- During the Gram staining process, Gram negative bacteria do not retain the crystal violet stain and instead take up the counterstain (safranin), resulting in a pink appearance. This is contrary to the statement that they stain purple.
Antibiotic Resistance
- Outer Membrane Barrier:
- The presence of an outer membrane in Gram negative bacteria acts as a protective barrier, making it more challenging for many antibiotics to penetrate. This outer membrane contains lipopolysaccharides and proteins that can also act as efflux pumps, expelling antibiotics.
- Intrinsic Resistance:
- Many Gram negative bacteria possess intrinsic resistance mechanisms that contribute to their overall resistance to various antibiotics. They often have fewer target sites for antibiotics compared to Gram positive bacteria.
Conclusion
The correct statement, option 'B', indicates that Gram negative bacteria are generally more resistant to antibiotics than Gram positive bacteria. This is primarily due to their unique cell wall structure, which provides an additional layer of defense against antimicrobial agents.
Gram negative bacteria are known for their distinct structural characteristics and their implications for antibiotic resistance.
Key Characteristics of Gram Negative Bacteria:
- Cell Wall Structure:
- Gram negative bacteria have a thin layer of peptidoglycan located between the inner cytoplasmic membrane and an outer membrane. This differs from Gram positive bacteria, which possess a thick layer of peptidoglycan and no outer membrane.
- Staining Properties:
- During the Gram staining process, Gram negative bacteria do not retain the crystal violet stain and instead take up the counterstain (safranin), resulting in a pink appearance. This is contrary to the statement that they stain purple.
Antibiotic Resistance
- Outer Membrane Barrier:
- The presence of an outer membrane in Gram negative bacteria acts as a protective barrier, making it more challenging for many antibiotics to penetrate. This outer membrane contains lipopolysaccharides and proteins that can also act as efflux pumps, expelling antibiotics.
- Intrinsic Resistance:
- Many Gram negative bacteria possess intrinsic resistance mechanisms that contribute to their overall resistance to various antibiotics. They often have fewer target sites for antibiotics compared to Gram positive bacteria.
Conclusion
The correct statement, option 'B', indicates that Gram negative bacteria are generally more resistant to antibiotics than Gram positive bacteria. This is primarily due to their unique cell wall structure, which provides an additional layer of defense against antimicrobial agents.
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Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer?
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Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer?.
Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer?.
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Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Which of the following statement is correct ?a)Gram negative bacteria are colored purple after Gram stainingb)Gram negative bacteria are commonly more resistance to antibiotics than Gram positive bacteriac)Gram negative bacteria cell wall consists of a thick layer of peptidoglycan outside the plasma membraned)Cell wall of Gram negative bacteria does not contain an outer membraneCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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