A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
To a considerable degree, the adaptabilityof bacteria and other prokaryotes depends on their ability to ?turn on? ?turn off? the expression of specific sets of genes in response to environmental changes. Regulatory mechanisms of this type are very important in microorganisms because of the frequent exposure of these organisms to sudden changes in environment. They provide microorganisms with a great deal of ?plasticity?, an ability to rapidly adjust their metabolic processes in order to achieve maximum growth and reproduction under highly variable environmental conditions.
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