Final answer:
The strain used to identify bacteria with a large amount of peptidoglycan in their cell walls is the Gram-positive strain.
Step-by-step explanation:
The strain used to identify bacteria with a large amount of peptidoglycan in their cell walls is the Gram-positive strain.
Gram-positive bacteria have a thick cell wall consisting of many layers of peptidoglycan, which differentiates them from Gram-negative bacteria.
The peptidoglycan layers in Gram-positive bacteria are also commonly embedded with teichoic acids (TAs), which stabilize the peptidoglycan and play a role in bacterial infection.