• Classification of Polysaccharides:
• Structural Polysaccharides:
• Chitin: Homopolysaccharide of $N$-acetyl-$\beta$-D-glucosamine with $\beta(1\to 4)$ linkages; provides rigidity to arthropod exoskeletons and fungal cell walls.
• Peptidoglycan: Structural polymer of alternating NAG and NAM cross-linked by peptide bridges, forming the rigid outer envelope of bacterial cells.
• Storage Polysaccharides:
• Starch and (B) Glycogen: Energy storage polymers composed of D-glucose linked by $\alpha(1\to 4)$ and $\alpha(1\to 6)$ glycosidic bonds.
• Conclusion: Therefore, (C) and (D) only are structural polysaccharides.

Correct option: (4) (C) and (D) only.

• Glycosaminoglycans (Mucopolysaccharides):
• Heteropolysaccharides consisting of repeating disaccharide units composed of an amino sugar ($N$-acetylglucosamine or $N$-acetylgalactosamine) and an uronic acid:
• Hyaluronic acid: Unsulfated GAG of D-glucuronic acid and GlcNAc; provides lubrication and viscoelasticity in synovial fluid.
• Chondroitin sulfate: Sulfated GAG of D-glucuronic acid and GalNAc-sulfate; provides compressive resistance in cartilage and connective tissues.
• Non-GAG Polysaccharides:
• Cellulose: Plant cell wall structural glucan ($eta(1\to 4)$-linked glucose).
• Chitin: Exoskeleton structural polymer ($N$-acetylglucosamine homopolymer).
• Conclusion: Therefore, (A) and (B) only are glycosaminoglycans.

Correct option: (2) (A), (B) only.

• Properties of Polypeptides:
• Correct: Peptide bonds are covalent amide linkages formed between the $\alpha$-carboxyl group of one amino acid and the $\alpha$-amino group of another via condensation/dehydration.
• Correct: Due to resonance delocalization of the lone pair of electrons on nitrogen with the carbonyl $\pi$-system, the peptide bond exhibits approximately $40\%$ double-bond character, rendering it rigid, planar, and non-rotatable.
• Correct: Peptides can contain non-standard/unusual amino acids, such as D-amino acids in peptide antibiotics (gramicidin, polymyxin) and post-translationally modified residues (hydroxyproline, $\gamma$-carboxyglutamate).
• Incorrect: Polypeptides are not always synthesized by ribosomes; non-ribosomal peptide synthetases (NRPS) assemble various microbial peptides independently of mRNA and ribosomes.
• Conclusion: Statements (A), (B) and (C) only are correct.

Correct option: (1) (A), (B) and (C) only.

• Hormonal Regulation of Blood Glucose:
• Glucagon: Secreted by pancreatic $\alpha$-cells; elevates blood glucose by stimulating hepatic glycogenolysis and gluconeogenesis.
• Cortisol: Glucocorticoid secreted by the adrenal cortex; elevates blood glucose by stimulating hepatic gluconeogenesis and decreasing peripheral glucose utilization in muscle and adipose tissue.
• LH (Luteinizing Hormone) and (D) FSH (Follicle Stimulating Hormone): Pituitary gonadotropins that regulate steroidogenesis and gametogenesis in the gonads; they do not have direct glycemic regulatory roles.
• Conclusion: Therefore, hormones (B) and (C) only directly affect blood glucose levels.

Correct option: (4) (B), (C) only.