How does the behavior of an electron change when it forms a covalent bond

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Development has provided electrically for less money but what may be considered a cause of nuclear power

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?