Which of the following are examples of direct contact that could lead to the spread of communicable diseases? Check all that apply. .sneezing

.coughing

.kissing

.engaging in sexual activity

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer