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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 - Challenge Me

NameDate

Circle the best answer.

  2. A molecule is built from glucose units and gives plant cell walls their strength. Which molecule is it, Ari?

    • Starch, a stored carbohydrate
    • Keratin, a protein
    • Olive oil, a lipid
    • Cellulose, a carbohydrate

  3. A molecule is built from nucleotides and kept in the nucleus. Which molecule is it, Bo?

    Use the picture in question 1.

    • An enzyme protein
    • A cell membrane lipid
    • Starch
    • DNA

  4. A molecule is built from glycerol and fatty acids and is liquid at room temperature. Which molecule is it, Esme?

    Use the picture in question 1.

    • A plant oil, a lipid
    • A solid fat, a lipid
    • A protein
    • Starch

  5. Which list holds only starchy plant foods, rich in carbohydrates, Jun?

    • Brown rice, oats, potatoes
    • Olive oil, oats, potatoes
    • Olive oil, canola oil, sunflower oil
    • Canola oil, sunflower oil, oats

  6. Which list holds only lipids, Kira?

    • Olive oil, canola oil, sunflower oil
    • Potatoes, oats, brown rice
    • Brown rice, canola oil, potatoes
    • Olive oil, oats, sunflower oil

  7. Ribosomes join amino acids in a set order to make a protein. Which molecule holds the instructions for that order, Milo?

    • Another protein, an enzyme
    • DNA, a nucleic acid
    • A lipid
    • Starch

  8. MedlinePlus says two of these give the body energy. Which two, Pia?

    • Fiber and nucleic acids
    • Carbohydrates and fats
    • Water and DNA
    • Fiber and water

  9. Ren says protein comes from animal foods alone. Agree or disagree?

    • Disagree: protein comes from plant oils instead
    • Agree: plants have no protein
    • Disagree: soy and beans supply protein
    • Agree: beans are just starch

  10. Tala says DNA is a kind of protein. Agree or disagree?

    • Disagree: DNA is a lipid
    • Agree: DNA and enzymes are one thing
    • Agree: DNA is built from amino acids
    • Disagree: DNA is a nucleic acid

  11. Zee says fats and oils are built from amino acids. Agree or disagree?

    • Disagree: they are built from nucleotides
    • Disagree: they come from glycerol and fatty acids
    • Agree: amino acids build fats too
    • Agree: oils are proteins
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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.

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