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Chemistry · Grades 9–12

Biomolecules and chemical structure

Connect monomers and linkages without saying all biological molecules are polymers.

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Learn the idea

Carbohydrates

Sugars can join through glycosidic links; structure matters for function.

Proteins

Amino-acid residues form chains with peptide, or amide, linkages.

Nucleic acids

Nucleotides form nucleic-acid chains containing a sugar-phosphate backbone and bases.

Lipids

Lipids are a diverse group and are not all repeating-monomer polymers.

Worked examples

Which bond class describes a peptide linkage?

Peptide bonds connect amino-acid residues through amide groups.

Amide.

Which building block belongs to nucleic acids?

Nucleotides contain base, sugar and phosphate components.

Nucleotide.

Check your understanding

  1. Are all lipids long repeating-monomer polymers?

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

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

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

Answers and marking notes

Answers and marking notes
  1. No.

    Lipids form a diverse class rather than one polymer pattern.

  2. 5

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

  3. Their linkages and spatial arrangements can differ.

    Structure can alter enzyme recognition and material properties.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.