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7th grade Carbohydrates, lipids, proteins and nucleic acids worksheet

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Carbohydrates, lipids, proteins and nucleic acids

Grade 7 Science Worksheet

NameDate

Circle the best answer.

  1. Cellulose gives a plant cell wall its strength. Which kind of molecule is cellulose, Ari?

    • A lipid
    • A carbohydrate
    • A protein
    • A nucleic acid

  2. Every cell membrane is built on a double layer of one kind of molecule. Which kind, Bo?

    • Lipids
    • Carbohydrates
    • Nucleic acids
    • Starch grains

  3. Ribosomes are tiny cell parts that join amino acids together. Which molecule do ribosomes make, Esme?

    • Proteins
    • Starch
    • Nucleic acids
    • Lipids

  4. A potato plant stores extra sugar in its potatoes as starch. Which choice names starch and its job, Jun?

    • A nucleic acid that holds genes
    • A lipid that forms membranes
    • A protein stored for growth
    • A carbohydrate stored for energy

  5. Luz wants a plant food that is a good source of protein. Which one fits?

    • Potatoes
    • Olive oil
    • Soy
    • Apple juice

  6. Many amino acids are joined in one long chain, like beads on yarn. What does the chain make, Milo?

    • A carbohydrate
    • A protein
    • A nucleic acid
    • A lipid

  7. Which of these is not built as a long chain of repeating blocks, Noah?

    • A fat, made of glycerol and fatty acids
    • A protein, made of amino acids
    • DNA, made of nucleotides
    • Starch, made of glucose units

  8. Each nucleotide holds a sugar, a phosphate and a base. What does a long chain of nucleotides make, Pia?

    • DNA, a nucleic acid
    • A protein
    • A fat
    • Starch

  9. Partway through a long bike ride, Ren's body starts drawing energy from fat as well. Which family of molecules is fat?

    • Fiber
    • Nucleic acids
    • Proteins acting as enzymes
    • Lipids

  10. Seeds from a purple-flowered pea plant grow into plants with purple flowers. Which molecule carries the flower-color instructions, Zee?

    • Water in the seed
    • DNA
    • A protein from the petals
    • Starch in the seed
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7th grade Carbohydrates, lipids, proteins and nucleic acids worksheet – printable
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About this worksheet

Carbohydrates, lipids, proteins and nucleic acids. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can name the building block of each of the four molecule families.
  • I can match each family to its main job in living things.
  • I can say which plant foods are rich in carbohydrates, lipids or protein.

Standard: none in middle school (HS-LS1-6 level)

Words to know

carbohydrate: Sugars and starches, built from sugar units; quick energy

lipid: Fats and oils, built from glycerol and fatty acids; stored energy, membranes

protein: A chain of amino acids that builds and repairs cells and does cell jobs

nucleic acid: DNA or RNA, a chain of nucleotides that carries instructions

enzyme: A protein that speeds up a reaction, like breaking down starch

Common mistakes

Your child matched a molecule with another family's building block. Sugars build carbohydrates, glycerol and fatty acids build fats, amino acids build proteins, and nucleotides build nucleic acids.

Your child gave one molecule another molecule's job. Carbohydrates give quick energy, lipids store energy and form membranes, proteins build and repair cells, nucleic acids carry instructions.

Your child matched a food to the wrong molecule. Starchy foods are rich in carbohydrates, plant oils are lipids, and soy and beans supply protein.

Questions parents ask

What is the most common mistake with carbohydrates, lipids, proteins and nucleic acids?

Your child matched a molecule with another family's building block. Sugars build carbohydrates, glycerol and fatty acids build fats, amino acids build proteins, and nucleotides build nucleic acids.

Are these 7th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 7 science

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