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 13 of 15
- A. C=O and N-H groups
- B. O-H groups
- C. N-H and C-H groups
- D. F-H groups
Explanation: In protein secondary structures, hydrogen bonds form between the carbonyl oxygen (C=O) of one amino acid and the amide hydrogen (N-H) of…
Correct answer: C=O and N-H groups- A. Folding
- B. Sequence of amino acids
- C. Coiling
- D. Hydrogen bonding pattern
Explanation: The primary structure is the most fundamental level of protein organization.
Correct answer: Sequence of amino acids- A. Peptide bond is a covalent bond
- B. It is a polyamide
- C. It contains different sequences of amino acids in different proteins
- D. Primary structure is due to hydrogen bonding
Explanation: This statement is false. The primary structure of a protein is determined solely by the sequence of amino acids linked by strong, covalent…
Correct answer: Primary structure is due to hydrogen bonding- A. α-helix
- B. Both A and C
- C. β-sheets
- D. 3-dimensional folding
Explanation: The secondary structure refers to the local, regular folding patterns of the polypeptide chain.
Correct answer: Both A and C- A. Hydrogen bonding
- B. Covalent bonding
- C. Debye forces
- D. Dipole-Dipole forces
Explanation: The primary structure, which is the sequence of amino acids. is held together by strong peptide bonds.
Correct answer: Covalent bonding- A. H-Bonds
- B. Disulphide linkages
- C. Covalent bonds
- D. Amino acids
Explanation: Disulfide linkages (or bridges) are covalent bonds formed between the side chains of two cysteine residues.
Correct answer: Disulphide linkages- A. Animals
- B. Plants
- C. Human beings
- D. Both A and C
Explanation: Globulin proteins are primarily found in animals, including humans, where they perform critical roles in the blood plasma.
Correct answer: Both A and C- A. Calopresti has made only three films so far, yet who is already a major force in Italian cinema.
- B. Calopresti has made only three films so far, yet him is already a major force in Italian cinema.
- C. Calopresti has made only three films so far, yet whom is already a major force in Italian cinema.
- D. Calopresti has made only three films so far, yet he is already a major force in Italian cinema.
Explanation: This option is correct. "He" is the subject pronoun that correctly refers to Calopresti, who is already established as a major force in…
Correct answer: Calopresti has made only three films so far, yet he is already a major force in Italian cinema.249. Antibodies are?
- A. Primary proteins
- B. Secondary proteins
- C. Tertiary proteins
- D. Quaternary proteins
Explanation: Antibodies are proteins the immune system produces to identify and neutralize foreign objects like bacteria and viruses.
Correct answer: Quaternary proteins- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The primary structure of a protein is defined as the sequence of amino acids linked together to form a polypeptide chain Secondary…
Correct answer: Option D- A. Adjacent to each other
- B. In successive spiral turns
- C. Between two different polypeptide chains
- D. None of the given options
Explanation: The most common types of secondary structures are the α helix and the β pleated sheet.
Correct answer: In successive spiral turns- A. Primary structure
- B. Secondary structure
- C. Tertiary structure
- D. Quaternary structure
Explanation: Hemoglobin has a quaternary structure. It consists of two pairs of different proteins, designated the α and β chains.
Correct answer: Quaternary structure- A. Non-crystalline
- B. More amino acids
- C. Peptide bonds
- D. Soluble in aqueous medium
Explanation: The following question deals with the differences between Globular and fibrous proteins and the student must be able to identify the…
Correct answer: Soluble in aqueous medium- A. Primary Proteins
- B. Secondary Proteins
- C. Tertiary Proteins
- D. Both Primary and Tertiary Proteins
Explanation: •Primary structure of protein is the simplest level of protein structure.It comprises the number and sequence of amino acids in a protein…
Correct answer: Primary Proteins- A. Intermediate
- B. Simple
- C. Globular
- D. Fibrous
Explanation: Fibrous: This option is the correct answer. Fibrous proteins are characterized by their elongated, thread-like structure.
Correct answer: Fibrous- A. Alpha helix
- B. Beta helix
- C. Spiral
- D. Concentrate
Explanation: In protein secondary structure, the beta helix refers to a left-handed helical conformation formed by the polypeptide chain.
Correct answer: Beta helix- A. S
- B. C
- C. N
- D. O
Explanation: Nitrogen is in all amino acids and nucleotides, and therefore in all proteins.
Correct answer: N- A. Alpha helix
- B. Beta helix
- C. Spiral
- D. Concentrate
Explanation: Option B is correct since B-pleated sheets found in globular protein X-ray structures are twisted.
Correct answer: Beta helix- A. Elastic
- B. Non-crystalline
- C. Disorgnanized
- D. Both A and B
Explanation: The distinguishing features of fibrous proteins are: Elastic: Fibrous proteins can stretch and return to their original shape.
Correct answer: Both A and B- A. Lipids
- B. Amino acids
- C. Proteins
- D. DNA
Explanation: Correct option:CWithin a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain.
Correct answer: Proteins