Identify the correct statements about biomolecules. A. Lipids are generally water soluble. B. Proteins are polypeptides. C. Polysaccharides are long chains of sugars. D. Adenine and guanine are substituted pyrimidines. E. Almost all enzymes are proteins. Choose the correct answer from the options given below:

Related Formula

Protein Structures: Primary = Linear amino acid sequence Secondary = Alpha-helix and Beta-pleated sheet Tertiary = 3D folding Quaternary = Multi-polypeptide complex

Core Logic

The α$\alpha$-helix and β$\beta$-pleated sheet conformations represent the secondary level of protein structure, stabilized by hydrogen bonds along the polypeptide backbone.

Step 1: Selection

Alpha-helix is found in Secondary structure. Option (4) is correct.

Pattern Recognition

Alpha-helix / Beta-sheet = Secondary structure.

Chapter Mix

Class 11 Biology: Biomolecules

Related Formula

Amino Acid Classification: Substituted Methanes: Central alpha carbon with -H$-H$, -COOH$-COOH$, -NH₂$-NH_2$, -R$-R$ Acidic: Glutamic acid Basic: Lysine Neutral: Valine Aromatic: Tyrosine, Phenylalanine, Tryptophan Alcoholic: Serine

Core Logic

• Statement A: Amino acids are substituted methanes (True).
• Statement B: Serine is an alcoholic amino acid, not aromatic (False).
• Statement C: Valine is a neutral amino acid (True).
• Statement D: Lysine is a basic amino acid, not acidic (False).

Step 1: Conclusion

Statements A and C are correct. Option (3) is correct.

Pattern Recognition

Lysine = Basic (D false). Serine = Alcoholic, not aromatic (B false). Leaves A and C.

Chapter Mix

Class 11 Biology: Biomolecules

Related Formula

Trypsin = Enzyme Morphine = Alkaloid Concanavalin A = Lectin Collagen = Intercellular ground substance

Core Logic

• Trypsin: Proteolytic enzyme arrow$\rightarrow$ III
• Morphine: Alkaloid secondary metabolite arrow$\rightarrow$ IV
• Concanavalin A: Lectin arrow$\rightarrow$ II
• Collagen: Structural protein acting as intercellular ground substance arrow$\rightarrow$ I

Step 1: Match Verification

Sequence: A-III, B-IV, C-II, D-I. Correct option is (1).

Pattern Recognition

Collagen = Intercellular ground substance (D-I). Concanavalin A = Lectin (C-II). Matches option (1).

Chapter Mix

Class 11 Biology: Biomolecules

Related Formula

Core Logic

Lyases are enzymes that catalyze the removal of groups from substrates by mechanisms other than hydrolysis, leaving double bonds behind in the product.

Step 1: Evaluation of Other Classes

• Transferases: Catalyze transfer of a functional group between substrates.
• Isomerases: Catalyze inter-conversion of optical/geometric isomers.
• Ligases: Catalyze joining of two compounds using ATP energy.

Pattern Recognition

Sees: Chemical reaction showing removal of groups leaving C=C$C=C$ double bond. Shortcut: Lyases class of enzymes.

Chapter Mix

Class 11 Biology: Biomolecules