Question

a single - celled organism can be classified as a prokaryote based on absence of
cell membrane
chromosome
nucleus
ribosome
possible points: 4

Explanation:

Prokaryotes are single - celled organisms that lack a true nucleus. They have a cell membrane, chromosomes (in the form of a circular DNA molecule), and ribosomes. The key distinguishing feature is the absence of a nucleus.

Answer:

C. Nucleus