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Biochemistry

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Grades 9–12 · Biochemistry

Which bond class describes a peptide linkage?

  1. Metallic.
  2. Ether only.
  3. Amide.
Answer and explanation

Amide.

Peptide bonds connect amino-acid residues through amide groups.

Grades 9–12 · Biochemistry

Which building block belongs to nucleic acids?

  1. Only fatty acid.
  2. Only glucose.
  3. Nucleotide.
Answer and explanation

Nucleotide.

Nucleotides contain base, sugar and phosphate components.

Grades 9–12 · Biochemistry

Are all lipids long repeating-monomer polymers?

  1. Only if found in plants.
  2. Yes, without exceptions.
  3. No.
Answer and explanation

No.

Lipids form a diverse class rather than one polymer pattern.

Grades 9–12 · Biochemistry

An unbranched chain has 6 amino-acid residues. How many peptide links connect adjacent residues?

Answer and explanation

5

A simple linear chain of n residues has n − 1 links.

Grades 9–12 · Biochemistry

Why can two carbohydrates with similar formulas have different biological roles?

Answer and explanation

Their linkages and spatial arrangements can differ.

Structure can alter enzyme recognition and material properties.

Grades 9–12 · Biochemistry

Which feature is part of a nucleotide?

  1. An entire cell wall.
  2. A nitrogen-containing base.
  3. Only a sodium ion.
Answer and explanation

A nitrogen-containing base.

A nucleotide includes a base along with sugar and phosphate.

Study notes