Cell Structures & Organelles — Drills · Grade 7 Science
Chapter: Cells, Transport & Cellular EnergyWhat these drills covers
By the end of Cell Structures & Organelles you should be able to:
- I can explain cell structures & organelles.
- I can use evidence, a model, and stated assumptions to support a biological explanation.
4 questions, multiple choice and written answer, each with a worked explanation.
Vocabulary used: organelle, cytoplasm, nucleus, ribosome, mitochondrion.
Problem 1
Which structure builds proteins?
- Cell wall
- Ribosome
- Scale bar
- Whole organ system
Answer and explanation
Ribosome
Ribosomes assemble proteins using cellular instructions.
Problem 2
Why do plant cells need usable energy even though they photosynthesize?
Answer and explanation
Building, transporting, repairing, and maintaining cellular conditions require energy transfers. Photosynthesis stores energy in food; respiration releases energy into usable forms.
Problem 3
Why would a completely sealed boundary be a poor cell model?
Answer and explanation
It would prevent needed exchanges such as uptake of materials and removal of wastes.
Problem 4
Why is “mitochondria create energy” misleading?
Answer and explanation
They help transfer energy from food into usable forms; energy is not created.