Prokaryotic and eukaryotic cells compared

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Bacterium (model drawing, not to scale). Ari studies a model drawing of a bacterium. Letter D points to the tangled loop of DNA in the middle of the cell. What is D called?

   • The nucleoid
   • A ribosome
   • The cell wall
   • The nucleus, as in a tiny animal cell
2. 2.

   model drawing, not to scale. Bo studies a second bacterium drawing. Letter B points to one of many small dots that build proteins. What are the dots called?

   • Nucleoids
   • Mitochondria
   • Ribosomes
   • Vacuoles

3. Read this first

   Use this

   Two cell cutaways side by side (model drawing, not to scale) above a Venn diagram. Left cutaway: a prokaryotic cell. Right cutaway: a eukaryotic (animal) cell. Venn diagram, left circle, prokaryotic cell only: DNA in a nucleoid; no membrane-bound organelles. Right circle, eukaryotic cell only: DNA inside a nucleus; membrane-bound organelles. Overlap, both cells: plasma membrane; cytoplasm; ribosomes; DNA.

4. 3.

   Jun reads a Venn diagram of two kinds of cell. In which part is the word ribosomes written?

   • Outside both circles, so neither kind of cell has them
   • In the left circle, so just prokaryotic cells have them
   • In the overlap, so both kinds of cell have them
   • In the right circle, so just eukaryotic cells have them
5. 4.

   Luz reads the Venn diagram. Which feature is listed in the right circle only, for eukaryotic cells?

   • DNA
   • Membrane-bound organelles
   • Ribosomes
   • A plasma membrane
6. 5.

   Word card (model). The word to define is prokaryote. Examples named on the card: bacteria and archaea. Not to scale. Milo learns the word prokaryote. Which meaning is right?

   • A cell that keeps its DNA safe inside a nucleus
   • A tiny animal cell that is too small to hold a nucleus
   • A cell with no nucleus and no membrane-bound organelles
   • A cell that has ribosomes and a membrane but no DNA

7. Use this

   Word card (model). The word to define is cell wall. Cells with a wall on the card: a bacterium, a plant cell, a fungal cell. Not to scale.

8. 6.

   Noah learns the word cell wall. Which meaning is right?

   • A rigid outer layer found in bacteria, plants and fungi
   • A jelly-like fluid that fills the inside of the cell
   • A thin outer layer that separates the cell from its surroundings
   • A rigid outer layer found in plant cells, but not in other cells

9. Use this

   Word card (model). The word to define is plasma membrane. It appears in both a prokaryotic cell and a eukaryotic cell. Not to scale.

10. 7.

    Pia learns the word plasma membrane. Which meaning is right?

    • The rigid layer that gives a plant cell its shape
    • The outer covering that separates the cell's inside from its surroundings
    • The jelly-like fluid that fills the inside of the cell
    • The region where a prokaryote keeps its DNA

11. Cell diameters (real data, from OpenStax Biology)

    kind of cell	diameter in µm
    prokaryotic cell	0.1 to 5.0
    eukaryotic cell	10 to 100

12. 8.

    Ren reads the table. About how wide is a prokaryotic cell?

    • 0.1 to 100 µm
    • 10 to 100 µm
    • 0.1 to 5.0 µm
    • 5.0 to 10 µm
13. 9.

    A bacterium in Tala's pond-water sample is about 2 µm wide. Using the table, which kind of cell does that size fit?

    • Eukaryotic, since a bacterium is a tiny animal cell
    • Eukaryotic, since 2 µm is inside 10 to 100 µm
    • Prokaryotic, since 2 µm is inside 0.1 to 5.0 µm
    • Neither, since no cell is as small as 2 µm
14. 10.

    Zee uses the table. Which kind of cell is about 10 to 100 µm across?

    • Prokaryotic cells
    • Eukaryotic cells
    • Both kinds of cell, since cells are alike in size
    • Bacteria, since a bacterium is an animal cell and animal cells are large