One method for separating polypeptides makes use of their different solubilities. The solubility of large polypeptides in water depends on the relative polarity of their R groups, particularly on the number of ionized groups: the more ionized groups there are, the more soluble the polypeptide. Which of each pair of polypeptides that follow is more soluble at the indicated pH? (a) (Gly)20 or (Glu)20 at pH 7.0
(b) (Lys–Ala)3 or (Phe–Met)3 at pH 7.0
(c) (Ala–Ser–Gly)5 or (Asn–Ser–His)5 at pH 6.0
(d) (Ala–Asp–Gly)5 or (Asn–Ser–His)5 at pH 3.0

Answer

The answers are below:

1.

(Gly)20 or (Glu)20 at ph 7.0

The answer is (Glu)20 because at a pH of 7 it has high negative charges so (Gly)20 is less soluble since it would remain unchanged

2.

Lys–Ala)3 or (Phe–Met)3 at pH 7.0

The answer is (Lys-Ala)3 because it has high positive charges at this pH while (phe-met)3 is lower this it is less soluble.

3.

Ala–Ser–Gly)5 or (Asn–Ser–His)5 at pH 6.0:

(Asn–Ser–His)5 is more soluble because though both of these polymers have the side chain Ser, (Asn–Ser–His)5 also have polar Asn side chain also it's His side chain is partially proponated.

4.

(Ala–Asp–Gly)5 or (Asn–Ser–His)5 at pH 3.0:

(Asn–Ser–His)5 is more soluble at ph of 3. this is because Asp residues are not fully proponated and they are also neutral, while (Asn–Ser–His)5 has its His residues fully proponated and also positively charged.

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the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.