B. An ecosystem in which plant roots are submerged during parts of the years
I think its when there is an over growth of cells.
Answer:
X is negative heterotropic modulator
Explanation:
In allosteric regulations, modulators are molecules that causes a change in the conformation of an enzyme, hence, resulting a change in enzyme activity. It can lead to a decrease or an increase of the enzyme. When a molecule decreases the enzyme activity it called a negative modulator, when it increases or activates the enzyme activity, it is called a positive modulator.
A positive or negative modulator can either be homotrophic (substrate acts as modulator) or heterotropic (another ligand acts as modulator).
In the example above, X is negative heterotropic modulator, because the modulator is different from the substrate and it also decreases the enzyme activity.
Answer:
help to form a plug to stop bleeding during hemostasis
Explanation:
Platelets are one of the three types of blood cells. Platelets are involved in the formation of blood clots. Platelet vesicles have clotting factors and other substances required for the formation of a platelet plug during homeostasis. A break or damage in the lining of blood vessels exposes the underlying collagen fibers and the connective tissues. Platelets adhere to these fibers to initiate the formation of a platelet plug. These adhered platelets release substances to trigger the other platelets to join and form aggregate. This aggregate of platelets is called a platelet plug.
