Fact 1: Prokaryotes are single-celled organisms that lack a nucleus.

Fact 2: Prokaryotes are usually microscopic and bacteria is an example of a prokaryote.

Given the two facts above, answer the question "What do some bacteria lack?" with the following options: 
- Energy
 - nucleus
 - glucose
 - Energy.
 - properties
 - oxygen
 - alleles
 - warmth


 

  nucleus       