Answer: 1: positive, 2: negative, 3: layer of peptidoglycan, 4: thin layer of peptidoglycan and slime body
Explanation: gram-positive cells are more receptive and susceptible to penicillin and/or cell wall targeted antibiotics despite their thick layer of peptidoglycan. However, gram-negative cells which has a thin layer of the peptidoglycan but it possesses slime body which helps them to wade off antibiotics attacks. This helps them to become resistance to antibiotics and makes them stronger.