Cytokines are protein-based chemical messengers that allow for communication between cells of the immune system. True or False

True

Explanation:

Cytokines are proteinaceous substances that are secreted by specific immune system cells. These belong to a category of signaling molecules that are helpful in communication between the cells of immune system and thus help to mediate and regulate immunity, inflammation and hematopoiesis. Cytokines have ability to act on three types of cells -

These molecules bind to the receptors present on the responsive target cell and evoke a particular biological activity.

Explanation:

1.  Cytokines are small proteins or protein-based chemical messengers secreted by some cells of immune system and they play various functions in the immune response.

2. They are secreted by some cells  and its value is changed according to the requirement  in the cell.

3. They works in a specific manner.

4. They mediate and regulate immunity in both innate and adaptive, inflammation and hematopoiesis.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

the missing space is phylum