Antibiotics act by which of the following mechanisms?
1. Preventing protein synthesis
2. Preventing cell wall synthesis
3. Preventing folic acid synthesis
4. All of the above
Which of the following is NOT true regarding the structure of cellular membranes?
1. They are made of only a single layer of lipids
2. They are transversed by proteins
3. They contain phospholipids
4. They are asymmetrical, with regard to the proteins facing each side