1. Various types of bacteria
According to the text: “Prokaryotes…have relatively simple structures”.
Not really. That older view is changing rapidly as more and more complex structures are unveiled inside prokaryotes.
Figure 1-7

2. An example of a simple organelle in many bacteria
The carboxysome:
An example of a simple organelle in many bacteria
A single cyanobacterial cell (about to divide). Several carboxysomes are visible

3. Function of the carboxysome: CO2 fixation is enhanced by encapsulating together two enzymes that act in sequence, CA (carbonic anhydrase), which produces CO2, and RuBisCO, which uses it as a substrate

4. Atomic Structure, Assembly, and Transport in Bacterial Microcompartments
BMC shell protein assembly
Transport through pores