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Quiz: Biological Macromolecules

Test your understanding of Chapter 3. \n---

1. Which element is central to organic macromolecules due to its tetravalence?

  1. Nitrogen
  2. Carbon
  3. Oxygen
  4. Sulfur
Show Answer

The correct answer is B. Carbon has four valence electrons, enabling four covalent bonds and diverse structures (Carbon skeleton overview).

Concept Tested: Carbon tetravalence

2. Which polymer is formed when glucose units are linked by α-1,4 glycosidic bonds for energy storage?

  1. Cellulose
  2. Starch
  3. Chitin
  4. DNA
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The correct answer is B. Starch stores glucose in plants via α-1,4 linkages (Carbohydrate section).

Concept Tested: Polysaccharide structure

3. What distinguishes cellulose from starch?

  1. Cellulose uses β-linkages and forms structural fibers
  2. Cellulose contains nitrogen bases
  3. Starch has peptide bonds
  4. Starch contains calcium ions
Show Answer

The correct answer is A. Cellulose uses β-1,4 linkages, producing straight structural fibers (Cellulose subsection).

Concept Tested: Structural vs. storage polysaccharides

4. Which functional group gives amino acids their acidic character?

  1. Amino (–NH₂)
  2. Methyl (–CH₃)
  3. Carboxyl (–COOH)
  4. Phosphate (–PO₄³⁻)
Show Answer

The correct answer is C. Carboxyl groups can donate H⁺, making amino acids acidic (Amino acid structure section).

Concept Tested: Amino acid functional groups

5. Which level of protein structure involves hydrogen bonds between backbone atoms forming α-helices or β-sheets?

  1. Primary
  2. Secondary
  3. Tertiary
  4. Quaternary
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The correct answer is B. Secondary structure describes local hydrogen-bonded patterns like α-helices and β-sheets (Protein structure section).

Concept Tested: Protein structural hierarchy

6. What stabilizes the tertiary structure of proteins?

  1. Peptide bonds between amino acids
  2. Hydrogen bonds, ionic interactions, hydrophobic clustering, and disulfide bridges
  3. Glycosidic linkages
  4. Phosphodiester bonds
Show Answer

The correct answer is B. Tertiary structure relies on side-chain interactions, including hydrophobic and covalent bonds (Tertiary structure discussion).

Concept Tested: Tertiary structure stabilization

7. Which statement describes the role of chaperonins?

  1. They hydrolyze misfolded proteins
  2. They assist proteins in achieving proper folding
  3. They act as enzymes in glycolysis
  4. They store genetic information
Show Answer

The correct answer is B. Chaperonins provide an isolated environment to help proteins fold correctly (Protein folding section).

Concept Tested: Chaperonin function

8. What is the primary structural difference between saturated and unsaturated fatty acids?

  1. Saturated fatty acids contain double bonds
  2. Unsaturated fatty acids have double bonds causing kinks
  3. Saturated fatty acids lack hydrogen atoms
  4. Unsaturated fatty acids are solid at room temperature
Show Answer

The correct answer is B. Unsaturated fatty acids contain cis double bonds that introduce bends (Lipids section).

Concept Tested: Fatty acid saturation

  1. Peptide bond
  2. Phosphodiester bond
  3. Glycosidic bond
  4. Hydrogen bond
Show Answer

The correct answer is B. Phosphodiester bonds connect the sugar-phosphate backbone in nucleic acids (Nucleic acid section).

Concept Tested: Nucleotide linkage

10. Why does denaturation disrupt protein function?

  1. It breaks peptide bonds, destroying primary structure
  2. It alters secondary and tertiary structures critical for activity
  3. It doubles the protein’s size
  4. It removes amino acids from the sequence
Show Answer

The correct answer is B. Denaturation unfolds higher-order structures without necessarily breaking peptide bonds, losing functional shape (Protein denaturation discussion).

Concept Tested: Denaturation effects