Question

the picture shows a student using a microscope to study a prepared slide of a single - celled organism.

1. a single - celled organism can be classified as a prokaryote based on the absence of -

clear all
a nucleus
chromosomes
ribosomes
a cell membrane

Explanation:

Prokaryotes are single - celled organisms that lack a nucleus. Chromosomes are present in prokaryotes (though not in a membrane - bound nucleus), ribosomes are also present in prokaryotes (as they are needed for protein synthesis), and prokaryotes have a cell membrane.

Answer:

a nucleus