exam 2 material

Question 1

phospholipids are large organic molecules with a __,polar phosphate head connected to ___,non polar fatty acid tails. How do these molecules arrange themselves to form a mostly impermeable barrier between a liposome and its environment

Answer 1

hydrophilic; hydrophobic; they line up hydrophobic tails facing each other at the center line of the membrane with the hydrophilic heads facing outward, away from the center line of the membrane

Question 2

during the process of ___, water diffuses across a semipermeable membrane from a hypotonic solution to a hypertonic solution

Answer 2

osmosis

Question 3

adenine, thymine, guanine, and cytosine are the ___ building blocks for DNA; they are organized in different combos to code for all of the proteins needed to accomplish everything the cell does

Answer 3

nucleotide