UET Lahore ECAT Chemistry: Macromolecules MCQs

Practice Macromolecules MCQs for UET Lahore ECAT Chemistry — topic-wise sets with solved answers.

UET Lahore ECAT Chemistry: Macromolecules MCQs — sample questions

  1. Question 1

    Q1. What is the primary structure of a protein?

    • A) Sequence of amino acids
    • B) Alpha helix
    • C) Beta sheet
    • D) Tertiary structure

    Answer: Sequence of amino acids

    Explanation: Primary structure is the sequence of amino acids in a protein, determined by peptide bonds between amino acids.

  2. Question 2

    Q2. Which type of bond is responsible for the formation of a peptide bond?

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

    Answer: Covalent bond

    Explanation: Peptide bond is a covalent bond formed between the carboxyl group of one amino acid and the amino group of another.

  3. Question 3

    Q3. What is the molecular formula for glucose?

    • A) C5H10O5
    • B) C6H12O6
    • C) C6H10O5
    • D) C5H12O6

    Answer: C6H12O6

    Explanation: Glucose is a simple sugar with the molecular formula C6H12O6, indicating 6 carbon, 12 hydrogen, and 6 oxygen atoms.

  4. Question 4

    Q4. Which polysaccharide is composed of glucose units joined by α-1,4-glycosidic bonds?

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

    Answer: Starch

    Explanation: Starch is a polysaccharide composed of glucose units joined by α-1,4-glycosidic bonds, serving as energy storage in plants.

  5. Question 5

    Q5. What type of nucleic acid is responsible for carrying genetic information from DNA to the ribosome?

    • A) mRNA
    • B) tRNA
    • C) rRNA
    • D) snRNA

    Answer: mRNA

    Explanation: mRNA (messenger RNA) carries genetic information from DNA to the ribosome for protein synthesis.

  6. Question 6

    Q6. Which of the following is a characteristic of a protein's tertiary structure?

    • A) Sequence of amino acids
    • B) Alpha helix
    • C) Folding of polypeptide chain
    • D) Beta sheet

    Answer: Folding of polypeptide chain

    Explanation: Tertiary structure refers to the overall 3D folding of a polypeptide chain, stabilized by various interactions.

  7. Question 7

    Q7. What is the name of the process by which a protein loses its native structure?

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

    Answer: Denaturation

    Explanation: Denaturation is the process by which a protein loses its native structure due to external factors like temperature or pH.

  8. Question 8

    Q8. Which type of lipid is composed of a glycerol backbone and three fatty acid chains?

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

    Answer: Triglyceride

    Explanation: Triglyceride is a type of lipid composed of a glycerol backbone and three fatty acid chains, serving as energy storage.

  9. Question 9

    Q9. What is the function of the enzyme helicase in DNA replication?

    • A) Unwinding double helix
    • B) Synthesizing new DNA strands
    • C) Repairing damaged DNA
    • D) Binding to DNA

    Answer: Unwinding double helix

    Explanation: Helicase is an enzyme that unwinds the double helix structure of DNA during replication.

  10. Question 10

    Q10. Which of the following is an example of a fibrous protein?

    • A) Collagen
    • B) Hemoglobin
    • C) Myoglobin
    • D) Enzyme

    Answer: Collagen

    Explanation: Collagen is a fibrous protein that provides structural support in connective tissue.

  11. Question 11

    Q11. What is the term for the process of combining multiple polypeptide chains to form a protein?

    • A) Dimerization
    • B) Polymerization
    • C) Aggregation
    • D) Quaternary structure formation

    Answer: Quaternary structure formation

    Explanation: Quaternary structure formation refers to the assembly of multiple polypeptide chains to form a functional protein.

  12. Question 12

    Q12. Which nucleic acid is responsible for transferring amino acids to the ribosome during protein synthesis?

    • A) mRNA
    • B) tRNA
    • C) rRNA
    • D) snRNA

    Answer: tRNA

    Explanation: tRNA (transfer RNA) carries amino acids to the ribosome and matches them to the corresponding codons on mRNA.

  13. Question 13

    Q13. What is the name of the bond that links two monosaccharides together?

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

    Answer: Glycosidic bond

    Explanation: Glycosidic bond is a covalent bond that links two monosaccharides together, forming a disaccharide.

  14. Question 14

    Q14. Which type of protein structure is stabilized by hydrogen bonds between amino acids?

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

    Answer: Secondary structure

    Explanation: Secondary structure is stabilized by hydrogen bonds between amino acids, resulting in alpha helices and beta sheets.

  15. Question 15

    Q15. What is the term for the study of the three-dimensional structure of molecules?

    • A) Stereochemistry
    • B) Structural biology
    • C) Molecular biology
    • D) Biochemistry

    Answer: Structural biology

    Explanation: Structural biology is the study of the three-dimensional structure of molecules, including proteins and nucleic acids.

  16. Question 16

    Q16. Which of the following is a characteristic of a globular protein?

    • A) Fibrous structure
    • B) Soluble in water
    • C) Insoluble in water
    • D) Structural support

    Answer: Soluble in water

    Explanation: Globular proteins are generally soluble in water and have a compact, spherical shape.

  17. Question 17

    Q17. What is the name of the process by which a cell becomes specialized to perform a specific function?

    • A) Differentiation
    • B) Proliferation
    • C) Apoptosis
    • D) Mutation

    Answer: Differentiation

    Explanation: Differentiation is the process by which a cell becomes specialized to perform a specific function.

  18. Question 18

    Q18. Which type of RNA is a component of the ribosome?

    • A) mRNA
    • B) tRNA
    • C) rRNA
    • D) snRNA

    Answer: rRNA

    Explanation: rRNA (ribosomal RNA) is a component of the ribosome, which is responsible for protein synthesis.

  19. Question 19

    Q19. What is the term for the process of unwinding double-stranded DNA?

    • A) Replication
    • B) Transcription
    • C) Translation
    • D) Unwinding

    Answer: Unwinding

    Explanation: Unwinding is the process of separating double-stranded DNA into single strands, often during replication or transcription.

  20. Question 20

    Q20. Which of the following is an example of a reducing sugar?

    • A) Sucrose
    • B) Glucose
    • C) Fructose
    • D) Starch

    Answer: Glucose

    Explanation: Glucose is a reducing sugar because it has a free aldehyde group that can reduce other molecules.

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