Question

1. a scientist is reviewing the following features about a cell under a microscope.

cell features
1 has ribosomes
2 has dna enclosed in a nucleus
3 has a cell wall
is this cell a eukaryote or a prokaryote?
options:
this is a prokaryote because it has ribosomes that synthesize proteins.
this is a eukaryote because it has a nucleus.
this is a prokaryote because it has a cell wall.
this is a eukaryote because only eukaryotes have cell walls.

Explanation:

To determine if the cell is eukaryotic or prokaryotic, we analyze the cell features:

1. Ribosomes: Both prokaryotes and eukaryotes have ribosomes, so this feature alone doesn't distinguish them.
2. DNA enclosed in a nucleus: A key difference between eukaryotes and prokaryotes is that eukaryotes have a nucleus (where DNA is enclosed), while prokaryotes have DNA in the nucleoid region without a nuclear membrane. This feature indicates a eukaryote.
3. Cell wall: Both prokaryotes (e.g., bacteria) and some eukaryotes (e.g., plants, fungi) can have cell walls, so this alone doesn't determine the type.

Now let's analyze the options:

• "This is a prokaryote because it has ribosomes that synthesize proteins." → Incorrect, as ribosomes are present in both.
• "This is a eukaryote because it has a nucleus." → Correct, as the cell has DNA enclosed in a nucleus, a defining feature of eukaryotes.
• "This is a prokaryote because it has a cell wall." → Incorrect, as cell walls are not exclusive to prokaryotes.
• "This is a eukaryote because only eukaryotes have cell walls." → Incorrect, as prokaryotes (like bacteria) also have cell walls.

Answer:

The correct option is the one with "This is a eukaryote because it has a nucleus." (the option with the blue dot in the image).