Answer:
A. Ions are unable to move through the phospholipid bilayer because the nonpolar tail regions of the phospholipids are hydrophobic.
Explanation:
Answers B, C, and D are wrong.
Answer:
3
Explanation:
Allowing the thermometer bulb to touch the beaker will result in inaccurate readings because the thermometer will conduct heat from the beaker. This will be worse especially if the beaker is not at temperature equilibrium with the liquid inside. Also, don't handle the thermometer until the temperature levels off.
