Ans.
Tuberculosis (TB) is a bacterial infection that affects mainly respiratory tract and can be transmitted from one to another person through contaminated air. The causative agent of tuberculosis, <em>Mycobacterium tuberculosis</em> has developed resistance against many antibiotics, such as rifampin and isoniazid, which is known as tuberculosis drug resistance.
If a person infected with TB shows drug resistance against some TB drugs, 'doctors should give other TB drugs to that person, even if these drugs show less effect than common drugs'. This is because these drugs can prevent or kill the bacterium more effectively than the common drugs for which, bacterium is resistance.
The correct answer is D. Mutation causing uncontrolled cell division.
Mutation is termed as the alteration of sequence of nucleotides which is permanent to organisms or extrachromosomal DNA or virus.
During DNA replication mutation may result from different errors. For example, during meiosis we can say that the result of mutation can be harmful if mutation can change proteins which are being produced by a gene.
Answer:
Explanation: red squirrels, who actively defend territories
Ant nests in an abandoned field
Buffalo grazing on a prairie
Bluegills swimming in a northern lake
