Carbohydrates, lipids, proteins and nucleic acids
Grade 7 Science Worksheet
Circle the best answer.
Cellulose gives a plant cell wall its strength. Which kind of molecule is cellulose, Ari?
- A nucleic acid
- A carbohydrate
- A protein
- A lipid
Ribosomes are tiny cell parts that join amino acids together. Which molecule do ribosomes make, Esme?
- Nucleic acids
- Proteins
- Starch
- Lipids
A potato plant stores extra sugar in its potatoes as starch. Which choice names starch and its job, Jun?
- A lipid that forms membranes
- A nucleic acid that holds genes
- A protein stored for growth
- A carbohydrate stored for energy
Sunflower oil is liquid at room temperature. Which building blocks make up its molecules, Kira?
- Glucose units
- Nucleotides
- Glycerol and fatty acids
- Amino acids
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
Which of these is not built as a long chain of repeating blocks, Noah?
- DNA, made of nucleotides
- A protein, made of amino acids
- A fat, made of glycerol and fatty acids
- Starch, made of glucose units
Each nucleotide holds a sugar, a phosphate and a base. What does a long chain of nucleotides make, Pia?
- A protein
- DNA, a nucleic acid
- A fat
- Starch
Partway through a long bike ride, Ren's body starts drawing energy from fat as well. Which family of molecules is fat?
- Lipids
- Proteins acting as enzymes
- Nucleic acids
- Fiber
MedlinePlus says one part of food helps the body repair cells and make new ones as children grow. Which one, Tala?
- Table sugar
- Fiber
- Plant oils
- Protein
Seeds from a purple-flowered pea plant grow into plants with purple flowers. Which molecule carries the flower-color instructions, Zee?
- A protein from the petals
- DNA
- Water in the seed
- Starch in the seed