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 true nucleus or membrane-bound organelles. The presence of a nucleus in the organism indicates that it is a eukaryotic organism, thus supporting the student's claim that it is not a bacterium.