Answer:
Permeability of plasma membrane is the rate of passive diffusion molecules across the biomembrane.
<u>Answer</u>: B) centrosome - food storage
<u>Explanation</u>: The organelles known as centrosomes have the purpose of organizing microtubules and thus provide the structure of the cell. They also play a vital part during cell division by pulling the chromatids apart.
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.
Mechanical energy turns into kinetic
