What is the conclusion in observing human cheek cells?

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Describe how alleles and genes are related

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