FSc Pre-Engineering Chemistry Macromolecules — Set 2

Macromolecules MCQs set 2 for FSc Pre-Engineering Chemistry — 20 solved questions.

FSc Pre-Engineering Chemistry Macromolecules — Set 2

  1. Question 1

    Q1. Which type of bond is responsible for the formation of a disaccharide?

    • A) Peptide bond
    • B) Glycosidic bond
    • C) Hydrogen bond
    • D) Ionic bond

    Answer: Glycosidic bond

    Explanation: Glycosidic bonds link monosaccharides to form disaccharides, involving the loss of a water molecule in a condensation reaction.

  2. Question 2

    Q2. Which macromolecule is composed of nucleotide monomers?

    • A) Protein
    • B) Carbohydrate
    • C) Nucleic acid
    • D) Lipid

    Answer: Nucleic acid

    Explanation: Nucleic acids, such as DNA and RNA, are polymers of nucleotides, which are composed of a sugar, phosphate, and nitrogenous base.

  3. Question 3

    Q3. What type of lipid is cholesterol?

    • A) Steroid
    • B) Triglyceride
    • C) Phospholipid
    • D) Glycolipid

    Answer: Steroid

    Explanation: Cholesterol is a steroid lipid, characterized by its four-ring structure, and plays a crucial role in cell membrane structure and hormone synthesis.

  4. Question 4

    Q4. Which carbohydrate is stored in animal livers and muscles?

    • A) Cellulose
    • B) Glycogen
    • C) Starch
    • D) Chitin

    Answer: Glycogen

    Explanation: Glycogen is a complex carbohydrate stored in animal livers and muscles, serving as a readily mobilizable energy reserve.

  5. Question 5

    Q5. What is the term for the process of combining monomers to form a polymer?

    • A) Hydrolysis
    • B) Polymerization
    • C) Depolymerization
    • D) Fermentation

    Answer: Polymerization

    Explanation: Polymerization is the process of forming a polymer from monomers, often involving condensation or addition reactions.

  6. Question 6

    Q6. Which nucleic acid is typically single-stranded?

    • A) DNA
    • B) RNA
    • C) Both DNA and RNA
    • D) Neither DNA nor RNA

    Answer: RNA

    Explanation: RNA (ribonucleic acid) is typically single-stranded, whereas DNA (deoxyribonucleic acid) is usually double-stranded.

  7. Question 7

    Q7. What is the main function of the polysaccharide cellulose?

    • A) Energy storage
    • B) Cell signaling
    • C) Structural support
    • D) Cell adhesion

    Answer: Structural support

    Explanation: Cellulose provides structural support in plant cell walls, forming a rigid framework that maintains cell shape.

  8. Question 8

    Q8. Which lipid is a major component of cell membranes?

    • A) Cholesterol
    • B) Triglyceride
    • C) Phospholipid
    • D) Glycolipid

    Answer: Phospholipid

    Explanation: Phospholipids are major components of cell membranes, forming a bilayer that surrounds the cell and regulates the movement of materials.

  9. Question 9

    Q9. Which type of bond is responsible for the linkage between amino acids in a protein?

    • A) Peptide bond
    • B) Glycosidic bond
    • C) Hydrogen bond
    • D) Ionic bond

    Answer: Peptide bond

    Explanation: Peptide bonds link amino acids together to form a polypeptide chain, involving the loss of a water molecule in a condensation reaction.

  10. Question 10

    Q10. What is the function of enzymes in biochemical reactions?

    • A) To provide energy
    • B) To synthesize proteins
    • C) To catalyze reactions
    • D) To store genetic information

    Answer: To catalyze reactions

    Explanation: Enzymes act as biological catalysts, speeding up biochemical reactions by lowering the activation energy required.

  11. Question 11

    Q11. Which macromolecule is responsible for storing genetic information?

    • A) Protein
    • B) Carbohydrate
    • C) Nucleic acid
    • D) Lipid

    Answer: Nucleic acid

    Explanation: Nucleic acids, such as DNA and RNA, store and transmit genetic information necessary for the development and function of living organisms.

  12. Question 12

    Q12. What type of reaction involves the breakdown of a polymer into monomers?

    • A) Polymerization
    • B) Hydrolysis
    • C) Depolymerization
    • D) Fermentation

    Answer: Hydrolysis

    Explanation: Hydrolysis is a reaction that involves the breakdown of a polymer into monomers using water, often catalyzed by enzymes.

  13. Question 13

    Q13. What is the term for the three-dimensional structure of a protein?

    • A) Primary structure
    • B) Secondary structure
    • C) Tertiary structure
    • D) Quaternary structure

    Answer: Tertiary structure

    Explanation: Tertiary structure refers to the overall 3D shape of a protein, determined by the interactions between amino acids and the secondary structures.

  14. Question 14

    Q14. Which polysaccharide is found in the cell walls of bacteria?

    • A) Peptidoglycan
    • B) Cellulose
    • C) Chitin
    • D) Glycogen

    Answer: Peptidoglycan

    Explanation: Peptidoglycan is a polysaccharide found in bacterial cell walls, providing structural support and maintaining the cell's shape.

  15. Question 15

    Q15. Which type of bond is responsible for the formation of a disulfide bridge?

    • A) Ionic bond
    • B) Hydrogen bond
    • C) Covalent bond
    • D) Van der Waals force

    Answer: Covalent bond

    Explanation: Disulfide bridges are formed by covalent bonds between cysteine residues, resulting in a strong linkage between protein chains.

  16. Question 16

    Q16. What is the term for the process by which a protein loses its native structure?

    • A) Denaturation
    • B) Renaturation
    • C) Hydrolysis
    • D) Oxidation

    Answer: Denaturation

    Explanation: Denaturation involves the disruption of a protein's native structure, often due to changes in temperature, pH, or chemical environment.

  17. Question 17

    Q17. Which of the following statements is true about enzymes?

    • A) They are consumed during a reaction
    • B) They increase the activation energy
    • C) They are highly specific to substrates
    • D) They are not affected by temperature

    Answer: They are highly specific to substrates

    Explanation: Enzymes are biological catalysts that exhibit high specificity for their substrates, facilitating chemical reactions without being consumed.

  18. Question 18

    Q18. What is the name of the process by which a carbohydrate is attached to a protein?

    • A) Glycosylation
    • B) Phosphorylation
    • C) Lipidation
    • D) Ubiquitination

    Answer: Glycosylation

    Explanation: Glycosylation involves the attachment of a carbohydrate molecule to a protein, often influencing protein function and stability.

  19. Question 19

    Q19. Which type of nucleic acid is involved in protein synthesis?

    • A) DNA
    • B) mRNA
    • C) tRNA
    • D) Both B and C

    Answer: Both B and C

    Explanation: Both mRNA and tRNA play crucial roles in protein synthesis, with mRNA carrying genetic information and tRNA bringing amino acids to the ribosome.

  20. Question 20

    Q20. What is the term for the study of the structure and function of nucleic acids?

    • A) Genomics
    • B) Transcriptomics
    • C) Molecular biology
    • D) Nucleic acid chemistry

    Answer: Molecular biology

    Explanation: Molecular biology encompasses the study of nucleic acids, including their structure, function, and interactions with other biomolecules.