The type of molecules that make up the majority of the cell membrane are a. carbohydrates b. transmembrane proteins c. cholesterol d. steroids e. phospholipids

E) phospholipids

Explanation:

Cell membranes are basicaly phospholipids with some other molecules occasionally.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.