You are correct. I rushed this and overlooked the mistake. Thank you. The muramic acid holds the peptide chain for cross bridge formation. I will be updating and replacing this with a new exam overview but have the more thorough peptidoglycan lecture here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fp0zN-mE-as.html
