Answer:
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 -
- The cell that secretes them
- The nearby cells
- The distant cells
These molecules bind to the receptors present on the responsive target cell and evoke a particular biological activity.
Answer:
False
Explanation:
A theory can be proven just the same as a hypothesis can.
Hope this helps!
Answer:
Contractile vacuole is responsible for maintaining the homeostasis in paramecium.
Explanation:
The observation of this experiment is that contractile vacuole is responsible for maintaining the homeostasis in paramecium because the contractile vacuole regulates the quantity of water inside a cell. Contractile vacuole controls the water balance in the body by absorbing and removing the excess amount of water out of the cell. This function of contractile vacuole allows the cells to survive under hypotonic stress that is present in the pond water or any other stressful environment.
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