26 Which of the following is true of the solubility of prote

26. Which of the following is true of the solubility of proteins in water? a Both fibrous and glcbular proteins are generally insoluble in water b. Bot fibrous and globular proteins are generally soluble in water Fibrous proins agenerally inscluble in water d. Globular proteins are generally insoluble in water 27. Which statement about the properties of a protein-protein interaction is not true? a. Reflects the conposition of protein surfaces, rather than the proteir core b. Enriched in hydrophobic rcsiducs, particularly in aromatic residucs c. Protein-proein interaction interfaces are dynamic and frequertly planar d. Exhibit both shape e. all of thern are truc and electrostatie complementarity 28. Ilow many chiral carbons are present in the open-chain form of an aldopentose? a. 2 b.3 29 When glucose adopts a pyranose structure which carbon is the anomeric carbon? 30 The cyclic structuics of monosaccharides are which of the following? a, acetals b. hemiacetals c. ethers d. esters 31. Which of the following side chains are hydrophilic? a, acidic b. basic c, polar but neutrad. all ofthese 32. Which of the following amino acids will exist as a -2 ion at very high pH? a. arginine c, isoleuc ine b. glatamic acid d. none of these 33. Which of the ollowing is serylalanine NH-CH-CNH CH NH, CHC-NH-CH CH, CH OH NH-CH-C-NH-ÇH-CONH-CH-C-NH-CH-CO CH, CH,OH CH,

Solution

(26)

On the basis of the shape of protein structure, they are classified into three groups.They are globular protein, Fibrous protein, and membrane protein.globular protein has a spherical shape and forms colloidal with water.so, it is soluble in water. Fibrous proteins are strand(elongated) like structure.they are insoluble in water, weak acid, and a weak base.

Answer C is correct

(27)

protein-protein interaction interfaces are dynamic and frequently non-planar.

(28)

the number of chiral carbon in aldopentose is 3.

(29)

C-1

(30)

hemiacetal

(31)

all of these

(32)

Amino acid forms the zwitterion at high pH. it is neutral.

option (d) is correct.

(33)

Structure (d) is correct structure of seryl-alanine