Answer the following question given this paragraph: 

Bacteria are surrounded by a cell wall consisting of peptidoglycan . This complex molecule consists of sugars and amino acids. The cell wall is important for protecting bacteria. The cell wall is so important that some antibiotics, such as penicillin, kill bacteria by preventing the cell wall from forming.


Q: What are surrounded by a cell wall consisting of peptidoglycan?

 Choices:

- viruses

- protozoa

- amoeba

- bacteria

A:
bacteria
