Question

a. the euglena is prokaryotic because it has a cytoplasm.
b. the euglena is eukaryotic because it has a flagellum.
c. the euglena is prokaryotic because it has mitochondria.
d. the euglena is eukaryotic because it has a nucleus
which of the following characteristics defines a cell as a eukaryote? *
being able to move
being able to reproduce
having a nucleus
having ribosomes

Explanation:

• For the first question:
• Prokaryotic cells lack a nucleus. Eukaryotic cells have a nucleus.
• Option a: Both prokaryotic and eukaryotic cells have cytoplasm.
• Option b: Flagella can be present in some prokaryotes (e.g., bacteria) and eukaryotes (e.g., euglena).
• Option c: Prokaryotic cells do not have mitochondria.
• Option d: Since euglena has a nucleus (as per the cell structure in the diagram), it is eukaryotic.
• For the second question:
• The key defining feature of a eukaryote is having a nucleus.
• Being able to move (e.g., some bacteria can move) and being able to reproduce (both prokaryotes and eukaryotes can reproduce) are not exclusive to eukaryotes.
• Both prokaryotes and eukaryotes have ribosomes.

Answer:

First question: d. The euglena is eukaryotic because it has a nucleus
Second question: Having a nucleus