<span> All the millions of different proteins in living things are formed by the bonding of only </span>20 amino acids<span> to make up long polymer chains.</span>
Answer:
Innate immunity is a non-specific immune system which provides defence against any pathogenic microorganism in early stages. It includes physical barrier such as skin, chemical barriers such as saliva, tears, et cetera, phagocytic cells such as macrophages, et cetera.
Acquired immune system is the one which develops after exposure to pathogen or antigen. It is highly specific in nature. It includes B-lymphocytes and T-lymphocytes. It includes the production of antibodies.
Vaccines are used to develop acquired immunity in people. The process is termed as vaccination or immunisation. Heat-killed or weakened pathogen or antigen is inserted into a person after which a person develops antibodies and memory cells against that pathogen or disease. So, the immune system acts more vigorously against that pathogen in secondary infection.
Thus, a person becomes immunised.
Catalyst. A catalyst is a substance that increases the rate of a reaction without being consumed the rate of a reaction without being consumed in process, or being chemically altered. There are many enzymes present in cells, proteases, lipases, that speed up metabolism, and catalysts .
hOpe this has helped you any . >)
B is correct, Organisms in the same group have similar characteristics
