Which of the following plays a role in preventing the entry of microorganisms into the body?

Antibiotics inhibit the growth of or destroy:

Select the correct option to fill up the blanks.
$(i)$ Diseases which are easily transmitted from one person to another,are called $.....$ diseases.
$(ii)$ In human body,parasite of malaria initially multiplies within the $........$ and then attack the $......$
$(iii) ......$ is the yellowish fluid secreted by mother during the initial days of lactation.
$(iv) ......$ and $.......$ are the primary lymphoid organs.

Triazenes are derived from:

The polypeptide chains in the structure of an antibody are held together by .........

$A$ state of malfunctioning of the body or parts of the body with specific signs and symptoms is known as.........