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
Option B is correct because statements I, II, and III are true: I describes the process of conjugation accurately, II correctly identifies Tatum and Lederberg's work on transduction in Salmonella, and III states that Xanthomonas citri is indeed the causative agent of citrus canker disease. Statement IV is misleading; while Hans Christian Gram's staining method does relate to cell wall composition, it does not provide a complete explanation of the method's principles, which involve the differential retention of crystal violet and safranin dyes based on the presence of peptidoglycan layers. Thus, options A and C are incorrect as they omit valid statements.
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