3. PI of a protein is dependent on the number of acidic and basic amino acid residues in the protein.

The study of proteins is important because all the genes in cellular DNA house the program or code for a unique protein structure.

Explanation:

Within the science parlance, pl is the short way to write Isoelectric Point. It is the pH  (that is the acidity or basicity) of a solution at which the net charge of a protein becomes nil.

The surface, in most cases, is likely going to be negatively charged when the pH of that same solution is above the pl. When this occurs, molecules that have similar negative charges will tend to move away or be repelled.

It is useful to note that the structure of proteins comprises of 20 amino acids all of which are connected by peptide bonds.

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i think its y= -4x-14

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.