The correct option is A. The use of antibacterial drugs can cause modifications in the genetic material of the concerned bacteria. If the genetic material of the bacteria are modify, that means they have undergone mutation. Because the base sequence of the normal and that of the mutated gene is different, antibiotic will not be able to recognize the bacteria again and thus will not be able to attack it.
The correct answer is- mutation to the DNA sequence
Explanation:
A change in the DNA sequence by base-pair addition, deletion or substitution or by any other way bring mutation in the DNA. In bacteria, random mutation occurs in their DNA sequence which can change the codon sequence and results in coding for some enzymes or protein that deplete the effect of antibiotics on them which provide antibiotic resistance to the them.
So by doing mutation in their DNA sequence bacteria can gain antibiotic resistance or the bacteria which already have the appropriate mutation in their DNA will be selected by natural selection and other bacteria will die due to antibiotic effect.
Therefore genetic modification is caused by mutation in the genetic sequence.
<em>Chromosomes compress, thicken, shorten, and become more apparent during prophase. At the centromere, chromosomes appear as two sister chromatids fused together. Chromosomes line up on the equator during metaphase.</em>
It is strong, yet flexible, allowing kelp to sway in the currents of the ocean. ... This ability to float raises the kelp to the sea surface forming a dense canopy.
