Cell membranes effectively serve as barriers between cells and the surrounding spaces because they are made of _____ phospholipids.
a. amphipathic
b. hydrophilic
c. hydrophobic
d. lipogenic
Question 2
Which vitamin is involved in producing nonprotein substances such as the neurotransmitters serotonin and dopamine?
a. Vitamin B3
b. Vitamin B5
c. Vitamin B6
d. Vitamin B12