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?

   • Mitochondria
   • Ribosomes
   • Nucleoids
   • Vacuoles
3. 3.

   Bacterium (model drawing, not to scale). Esme says only plant cells have a rigid outer layer. Letter A points to that layer on this bacterium. Which statement is right?

   • A is a plasma membrane, so this cell has no wall
   • A is a cell wall, so this must be a plant cell drawing
   • A is a cell wall, which a bacterium lacks, so the drawing is wrong
   • A is a cell wall, and bacteria have one too

4. 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.

5. 4.

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

   • In the right circle, so just eukaryotic cells have them
   • In the left circle, so just prokaryotic cells have them
   • Outside both circles, so neither kind of cell has them
   • In the overlap, so both kinds of cell have them
6. 5.

   Kira uses the Venn diagram to check a statement about DNA. Which sentence agrees with the diagram?

   • Just eukaryotic cells have DNA, because DNA needs a nucleus
   • Just prokaryotic cells have DNA, and it is kept in a nucleoid
   • Both kinds of cell keep their DNA inside a nucleus
   • Both kinds of cell have DNA, and a prokaryote keeps it in a nucleoid
7. 6.

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

   • Membrane-bound organelles
   • DNA
   • Ribosomes
   • A plasma membrane
8. 7.

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

9. 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

10. 8.

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

    • 0.1 to 5.0 µm
    • 0.1 to 100 µm
    • 10 to 100 µm
    • 5.0 to 10 µm
11. 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
    • Neither, since no cell is as small as 2 µm
    • Prokaryotic, since 2 µm is inside 0.1 to 5.0 µm
12. 10.

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

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