Free Macromolecules MCQs with Answers
299 Macromolecules MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
Last updated
Read the Macromolecules notesFree MDCAT chapter notes with key terms299 questions · page 3 of 15
- A. Peptide
- B. Enzymes
- C. Primary protein
- D. Secondary proteins
Explanation: Globular proteins fold into compact, roughly spherical structures, and enzymes are the main biological examples because their folded…
Correct answer: Enzymes- A. glumatic acid
- B. lactic acid
- C. aspartic acids
- D. glycine
Explanation: Amino acids contain both an amino group and a carboxyl group, while lactic acid contains a hydroxyl group and a carboxyl group but no…
Correct answer: lactic acid- A. Sweet taste
- B. Bitter taste
- C. Shining appearance
- D. Green colour
Explanation: The name glycine comes from the Greek word glykys, meaning sweet, because glycine has a sweet taste.
Correct answer: Sweet taste- A. Lysine
- B. Histidine
- C. Proline
- D. Glutamic acid
Explanation: Proline is considered neither acidic nor basic because its side chain does not provide an extra strongly acidic or basic group; it has one…
Correct answer: Proline- A. Acidic character of amino acids
- B. Basic character of amino acids
- C. Dipolar character of amino acids
- D. Non-polar structure of amino acids
Explanation: An amino acid can exist as an internal salt or zwitterion, with a positively charged amino group, NH3+, and a negatively charged…
Correct answer: Dipolar character of amino acids- A. 2 amino groups and 1 carboxylic group
- B. 1 amino and 1 carboxylic groups
- C. 2 carboxylic groups and 1 amino group
- D. 2 amino and 2 carboxylic groups
Explanation: An acidic amino acid has one amino group and two carboxylic acid groups, so it has an extra carboxyl group capable of donating protons.
Correct answer: 2 carboxylic groups and 1 amino group- A. 5
- B. 10
- C. 15
- D. 20
Explanation: In the traditional school-level classification, humans require 10 essential amino acids from the diet because the body cannot synthesise…
Correct answer: 10- A. Ninhydrin test
- B. Molisch test
- C. Biuretic test
- D. Benedict test
Explanation: Ninhydrin reacts with the free amino group of most amino acids to produce a characteristic deep blue or purple colour, so it is used for…
Correct answer: Ninhydrin test- A. Carboxyl to amino group
- B. Amino to carboxyl group
- C. Amino group only
- D. Carboxyl group only
Explanation: A zwitterion forms when the acidic carboxyl group transfers its proton to the basic amino group, producing -COO- and -NH3+ in the same…
Correct answer: Carboxyl to amino group- A. Quantum structure
- B. Secondary structure
- C. Tertiary structure
- D. Primary structure
Explanation: The regular alpha-helical coiling and beta-pleated zigzag arrangement of a polypeptide are produced mainly by hydrogen bonds between…
Correct answer: Secondary structure- A. Nitrogen
- B. Amino acids
- C. Carbon and hydrogen
- D. Sulphur
Explanation: Complete hydrolysis breaks peptide bonds by reaction with water and converts a protein into its constituent amino acids.
Correct answer: Amino acids- A. Derived protein
- B. Sample protein
- C. Proteoses
- D. Conjugated protein
Explanation: A conjugated protein contains a protein part combined with a non-protein component called a prosthetic group, such as a metal…
Correct answer: Conjugated protein- A. Zygology
- B. Zymology
- C. Zymurgy
- D. Zootaxy
Explanation: Zymology is the scientific study of fermentation, including the biochemical action of microorganisms and enzymes that convert sugars into…
Correct answer: Zymology- A. Zygology
- B. Zymology
- C. Zymurgy
- D. Zootaxy
Explanation: Zymurgy is the practical branch concerned with brewing, distilling and the industrial use of fermentation.
Correct answer: Zymurgy- A. yl
- B. ase
- C. one
- D. al
Explanation: Most enzyme names end in the suffix -ase, such as amylase, urease, and oxidase, often indicating the substance or reaction on which the…
Correct answer: ase- A. Non proteineous
- B. Proteineous
- C. sugars
- D. lipids
Explanation: Coenzymes are small, non-protein organic molecules that assist enzyme action, often by carrying electrons or chemical groups during a…
Correct answer: Non proteineous- A. Substrate
- B. Structure
- C. Temperature
- D. Pressure
Explanation: Enzyme specificity arises from the particular three-dimensional structure of its active site, whose shape and chemical groups fit certain…
Correct answer: Structure- A. Enzymes
- B. Substrate
- C. Lipids
- D. any of above
Explanation: Enzymes are biological catalysts, and most enzymes are proteins that speed up biochemical reactions without being consumed.
Correct answer: Enzymes- A. Homogeneous catalysis
- B. Heterogeneous catalysis
- C. Catalysis
- D. Ea
Explanation: When the catalyst and reactants are present in different physical phases, the process is heterogeneous catalysis.
Correct answer: Heterogeneous catalysis- A. Isomerases
- B. Lyases
- C. Transferases
- D. Ligases
Explanation: Isomerases catalyse intramolecular rearrangements, transferring a group from one position to another within the same molecule.
Correct answer: Isomerases