AIIMS 2017 Botany Bacterial Genetics Multiple Correct Question
Read the following statement regarding bacteria.
I. Bacteria exchange their genetic matter through conjugation which involve cell to cell contact.
II. Transduction in 'Salmonella is reported by Tatum and Lederberg in 1952.
III. Citrus canker disease is caused by bacteria Xanthomonascitri.
IV. Hans Christian gram's staining method is based on cell wall composition of bacteria.
Choose the correct option with true statements
I and II
I, II and III
I, III and IV
I, II, III and IV
Correct Answer
Detailed Explanation
ā Answer: I, III and IV are true
š¦ Explanation
š¢ I. True Bacteria exchange genetic material through conjugation, which requires direct cell-to-cell contact.
š“ II. False Transduction in Salmonella was reported by Zinder and Lederberg (1952), not Tatum and Lederberg. ā Tatum & Lederberg ā Conjugation ā Zinder & Lederberg ā Transduction
š¢ III. True Citrus canker is caused by the bacterium Xanthomonas citri.
š¢ IV. True Gram staining is based on differences in the cell wall composition of bacteria, particularly the thickness of the peptidoglycan layer.
š§ Quick Revision
Conjugation ā Tatum & Lederberg Transduction ā Zinder & Lederberg Citrus canker ā Xanthomonas Gram staining ā Cell wall composition
ā”ļø Correct: I, III & IV
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