A cell can be identified based on the structures present in the cell. The illustration below shows three different types of cells.

Question

From left to right, shown are a small prokaryotic cell, and then a large animal cell and large plant cell, which are labeled eukaryotic. The eukaryotic cells have many internal structures.

Which type of cell structure is included in all three cells?

a
mitochondria that contain DNA
b
a nucleus that contains DNA
c
a cell wall made of cellulose
d
a cell membrane made of a lipid bilayer

Answer 1

The type of cell structure included in all three cells (the small prokaryotic cell, the large animal cell, and the large plant cell) is:

d. a cell membrane made of a lipid bilayer.

Prokaryotic cells have a cell membrane, and both animal and plant eukaryotic cells also have cell membranes. The other options are specific to certain types of cells: mitochondria and nuclei are found in eukaryotic cells, and a cell wall made of cellulose is specific to plant cells.