A student uses a microscope to observe a single-celled organism that can move. The organism contains a nucleus and many chloroplasts. Based on the observations, the student claims the organism is not a bacterium. Which observation best supports the student's claim?

Question

M. The organism is unicellular.
P. The organism is able to move.
R. The organism has a nucleus.
s. The organism performs photosynthesis.

Answer 1

The observation that best supports the student's claim that the organism is not a bacterium is R. The organism has a nucleus.

Bacteria are prokaryotic organisms, which means they do not have a nucleus. In contrast, the presence of a nucleus indicates that the organism is eukaryotic. Therefore, the observation of a nucleus directly supports the claim that the organism is not a bacterium.