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.
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Read the Macromolecules notesFree MDCAT chapter notes with key terms299 questions · page 15 of 15
- A. Prosthetic Group
- B. Hydrogen Bonding
- C. Aldehyde Group
- D. Peptide Linkage
Explanation: Explanation:In conjugated protein molecules, the protein is attached or conjugated to some non-protein group which is called prosthetic…
Correct answer: Prosthetic Group- A. 25
- B. 27
- C. 21
- D. 23
Explanation: Explanation:In proteins, there are on the average 27 amino acid units for each turn in helix.
Correct answer: 27- A. Neutral
- B. Acidic
- C. Amphoteric
- D. Basic
Explanation: A is incorrect as lysine is not neutral.B is incorrect as lysine is not acidic.C is incorrect as lysine is not amphoteric.D is correct as…
Correct answer: Basic- A. Simple proteins
- B. Derived proteins
- C. Polyamides
- D. Polysaccharides
Explanation: A is correct as collagen and albumin are simple proteins,upon hydrolysis they produce amino acids only.B is incorrect as derived proteins…
Correct answer: Simple proteins- A. Glycine
- B. Serine
- C. Glutamine
- D. Lysine
Explanation: The amino acids having amino and carboxyl group attached to the same carbon, i.e, alpha-carbon atom is called alpha-amino acids.
Correct answer: Glycine286. α-amino acids are compounds having carboxylic acid as well as amino functional groups attached to:
- A. Any H-atom in the molecule
- B. Same carbon atom
- C. Alternate carbon atoms
- D. Neighboring carbon atoms
Explanation: α-Amino acids are simple molecules that are made of a central C-atom, that is bound to a primary amine group NH2 and to a carboxylic group…
Correct answer: Same carbon atom- A. A
- B. B
- C. C
- D. D
Explanation: An amino acid has both a basic amine group and an acidic carboxylic acid group.
Correct answer: B- A. Disulphide bridges
- B. Weak Van Der Waal's forces
- C. Presence of unpaired electron in the structure.
- D. Hydrogen bonding between NH group of one peptide and CO group of another peptide.
Explanation: Residue in the given structure of alpha helix is due to the hydrogen bonding between the NH group of one peptide and carbonyl (C=O) of…
Correct answer: Hydrogen bonding between NH group of one peptide and CO group of another peptide.- A. Zymase
- B. Invertase
- C. Cellulose
- D. Urease
Explanation: Explanation:Concentrated sugar solution undergoes hydrolysis into glucose and fructose by enzyme called Invertase.
Correct answer: Invertase- A. Zymase
- B. Invertase
- C. Urease
- D. Diastase
Explanation: Zymase is the enzyme that catalyses the fermentation of sugar into ethanol and carbon dioxide.
Correct answer: Zymase- A. -NH2
- B. -NH+3
- C. -COOH
- D. -COO-
Explanation: The correct answer is -COOH, which is the carboxylic acid functional group present in amino acids.
Correct answer: -COOH- A. ɑ-amino acids
- B. β-amino acids
- C. Both ɑ and β
- D. None of the above
Explanation: The correct answer is that all amino acids found in proteins are ɑ-amino acids.
Correct answer: ɑ-amino acids- A. Three polypeptide chains
- B. Four polypeptide chains
- C. Five polypeptide chains
- D. Six polypeptide chains
Explanation: Haemoglobin is a quaternary structure therefore its composed of four polypeptide chains, 2 alpha globins and 2 beta globins.
Correct answer: Four polypeptide chains- A. Protein
- B. Carbohydrate
- C. Lipid
- D. Vitamins
Explanation: Proteins are large biomolecules composed of amino acids linked together by peptide bonds.
Correct answer: Protein- A. Heat
- B. Change in pH
- C. Heavy metal salts
- D. All of the above
Explanation: Heavy metal salts interact with proteins causing a change in their tertiary structure which leads in the denaturation of protein
Correct answer: Heavy metal salts- A. Conjugated proteins
- B. Simple proteins
- C. Both (A) & (B)
- D. None of the above
Explanation: Albumin is an example of a conjugated protein. It is a type of protein that is combined (or conjugated) with a non-protein component…
Correct answer: Simple proteins- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation: Enzymes have a three-dimensional shape due to their tertiary structure.
Correct answer: Tertiary structure- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation: The protein present in hemoglobin has a tertiary structure. Hemoglobin is a globular protein composed of four polypeptide chains (two…
Correct answer: Quaternary structure- A. They have two functional groups
- B. They show both acidic and basic characteristics
- C. They are the basic units of proteins
- D. They do not exist in solid state
Explanation: Amino acids exist as zwitterions, which are molecules that have both positive and negative charges but are overall neutral.
Correct answer: They do not exist in solid state