Chapter 1 Pre-Lecture Quiz Question 10 11 of 11 Part A Drug-resistant tuberculos

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Chapter 1 Pre-Lecture Quiz Question 10 11 of 11 Part A Drug-resistant tuberculosis is a major health issue in many countries. Treatment for these resistant forms of bacteria is longer and requires more expensive antibiotics. Scientists attribute this to natural selection. Under these circumstances, what does natural selection mean? The tuberculosis genes mutated to avoid being killed by the antiblotic Tuberculosis bacteria discovered a way to avoid these particular antibilotics. An environment was created in which the tuberculosis bacterium carrying the antibiotic-resistant genes could reproduce. The antibiotic changed the DNA of the tuberculosis bacterium. Submit Request Answer Return to Assignment Provide Feedback

Explanation / Answer

The theory of natural selection states that more individuals are produced each generation that have a survival chance. Now let us look at the options:

The first option is partially correct as it suggests that the generation which got exposed to the antibiotic tried not to die through mutation.

The second option is incorrect as some of the organism did die when exposed to the antibiotic.

The last option is incorrect as the antibiotic does not have the property to change the DNA of tuberculosis bacterium but possesses a denaturing effect.

Consider the facts given. The resistant in TB bacterium was over a period of time. Now the correct option is 3 as an environement was created in such a way that TB resistant bacterium reproduced.This is in line with natural selection.

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