b. insertion
<span>
</span><span>The Klinefelter syndrome is caused by an insertion mutation. It occurs
when there is an existence of an excess or extra X chromosome in each cell that
may cause an abnormality in the development of males. It usually affects the
physical and cognitive development of male with symptoms varying from one
person to another. Kids with these type
of disorder may experience learning
disabilities and even speech and language
problems. These kids tend to be
quiet and very sensitive. They can also be very passive.
</span>
Answer:
The correct answer is: Attachment.
Explanation:
- Pilus are thread like structures which are present on the surface of the bacterial cell.
- They are mainly responsible for attaching the bacterial cells to a substrate, for obtaining food or to an eukaryotic cell for the purpose of infection.
- Pilus also mediate the process of conjugation in some bacterial cells.
- Conjugation is a process by which genetic material or plasmids are transferred from one bacteria to another through a channel formed in between the two bacteria by the help of the pilus.
- Pilus also helps the bacteria by preventing them from getting recognised by the immune cells in the host.
- A defective pilus will affect all the above processes, resulting in death of the bacteria.
Answer:
Beriberi is a disease caused by lack of vitamin B-1 called thiamine disease in the body.