NEET · Biology —

Biomolecules appeared 5 times across 1 year — 5.6% of Biology. This question is from Amino Acid Properties.

Year 2024 Total
Questions 5 5
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Which of the following statements are correct regarding amino acids? A. They are substituted methanes. B. Serine is an aromatic amino acid. C. Valine is a neutral amino acid. D. Lysine is an acidic amino acid. Choose the correct answer from the options given below:

Solution & Explanation

Related Formula

Amino Acid Classification: Substituted Methanes: Central alpha carbon with -H, -COOH, -NH₂, -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

Reference Study Guides

Biomolecules

More Biomolecules Previous-Year Questions

Q96 neet_2024_05_may_morning Structure of Biomolecules
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:
  • A. C, D and E only
  • B. B, C and E only
  • C. B, D and E only
  • D. A, B and C only

Solution

Related Formula

Purines: Adenine & Guanine Pyrimidines: Cytosine, Thymine, Uracil Lipids: Insoluble in water

Core Logic
  • A: Lipids are insoluble in water (False).
  • B: Proteins are polypeptides composed of amino acid chains (True).
  • C: Polysaccharides are polymers of monosaccharide sugar units (True).
  • D: Adenine and guanine are purines, not pyrimidines (False).
  • E: Almost all enzymes are proteins (True, except ribozymes).
Step 1: Conclusion

Correct statements are B, C, and E only. This matches Option (2).

Pattern Recognition

Adenine and Guanine = Purines (D is False). Lipids = Water insoluble (A is False). Correct statements are B, C, E.

Chapter Mix

Class 11 Biology: Biomolecules

Q105 neet_2024_05_may_morning Protein Structural Levels
Alpha-helix is found in which level of protein structure?
  • A. Quaternary structure
  • B. Tertiary structure
  • C. Primary structure
  • D. Secondary structure

Solution

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-helix and β-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

Q130 neet_2024_05_may_morning Secondary Metabolites and Biomolecules
Match List I with List II :
List IList II
A.TrypsinI.Intercellular ground substance
B.MorphineII.Lectin
C.Concanavalin AIII.Enzyme
D.CollagenIV.Alkaloid
Choose the correct answer from the options given below :
  • A. A-III, B-IV, C-II, D-I
  • B. A-I, B-II, C-III, D-IV
  • C. A-III, B-II, C-IV, D-I
  • D. A-IV, B-III, C-II, D-I

Solution

Related Formula

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

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

Q176 neet_2024_05_may_morning Enzyme Classification - Lyases
The following reaction depicts the activity of a particular class of enzymes:
Enzymatic reaction cleavage leaving double bond for Q176 - NEET 2024 Code 12
Chemical reaction diagram showing group removal from substrate without hydrolysis leaving a double bond.
Identify the enzymes class 'E' from the following options:
  • A. Ligases
  • B. Lyases
  • C. Isomerases
  • D. Transferases

Solution

Related Formula
matrix X & Y | & | C & - & C matrix E X - Y + C = C
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 double bond. Shortcut: Lyases class of enzymes.

Chapter Mix

Class 11 Biology: Biomolecules

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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)