Carbohydrates, lipids, proteins and nucleic acids

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   In row A of the chart, which building block goes in the box marked ?, Bo?

   • Nucleotides
   • Amino acids
   • Sugars such as glucose
   • Cell membranes
2. 2.

   In row D of the chart, which building block goes in the box marked ?, Esme?

   • Glycerol and fatty acids
   • Nucleotides
   • Amino acids
   • Starch grains
3. 3.

   In row A of the chart, which job goes in the box marked ?, Jun?

   • Builds and repairs cells
   • Carries genetic instructions
   • Quick energy for cells
   • Turns sunlight into water
4. 4.

   In row C of the chart, which job goes in the box marked ?, Kira?

   • Stores energy; forms cell membranes
   • Holds water in the soil
   • Quick energy for cells
   • Builds and repairs cells
5. 5.

   In row D of the chart, which job goes in the box marked ?, Luz?

   • Carries genetic instructions
   • Stores energy for a long time
   • Forms plant cell walls
   • Speeds up reactions, as enzymes do
6. 6.

   Brown rice, oats and potatoes are rich in starch. Which kind of molecule is starch, Milo?

   • A protein
   • A nucleic acid
   • A lipid
   • A carbohydrate
7. 7.

   Soy, beans and nut butters are plant sources of amino acids. Which molecule do amino acids build, Pia?

   • DNA
   • Proteins
   • Starches
   • Fats
8. 8.

   A molecule is built from glycerol and fatty acids. Which kind of molecule is it, Ren?

   • A protein
   • A starch
   • A fat or oil (lipid)
   • A strand of DNA
9. 9.

   DNA and RNA carry a cell's instructions. Which family of molecules do they belong to, Tala?

   • Carbohydrates
   • Proteins
   • Lipids
   • Nucleic acids
10. 10.

    Saliva holds an enzyme that starts breaking down the starch in bread. Which kind of molecule is that enzyme, Zee?

    • A sugar crystal
    • A protein
    • A fat
    • A starch