Bye not eating idk yo know
1. D
3. D
4.D
5.D
I don't know what you're trying to say about number 2. As for the rest the answers are somehow D. Looks sketchy, but to the extent of my knowledge those are the answers.
Answer:
Cell membrane.
Explanation:
Cytokines may be defined as the small molecules that plays an important role in the cell signalling as well as in the immune system as well. They are made of the peptides.
Pattern recognition receptor are important molecules that plays an important role in the innate immunity. These receptors are present on the surface of the cells like macrophages and monocytes. These receptors are made of the proteins and cannot pass the lipid bilayer. Hence, these receptors are located on the surface of the cell membrane.
Thus, the answer is cell membrane.