BIO 181 QUIZ 2 COMPREHENSIVE STUDY GUIDE
2026
◉ The liver is involved in detoxification of many poisons and drugs.
Which of the following structures is primarily involved in this
process and therefore abundant in liver cells?
Answer: Smooth ER
◉ Mammalian blood contains the equivalent of 0.15 M NaCl.
Seawater contains the equivalent of 0.45 M NaCl. What will happen if
red blood cells are transferred to seawater?
Answer: Water will leave the cells, causing them to shrivel and
collapse.
◉ What results from an unequal sharing of electrons between
atoms?
Answer: A polar covalent bond.
◉ According to the fluid mosaic model of cell membranes, which of
the following is a true statement about membrane phospholipids?
A. They can move laterally along the plane of the membrane.
, B. They frequently flip-flop from one side of the membrane to the
other.
C. They occur in an uninterrupted bilayer, with membrane proteins
restricted to the surface of the membrane.
D. They are free to depart from the membrane and dissolve in the
surrounding solution.
E. They have hydrophilic tails in the interior of the membrane.
Answer: A. They can move laterally along the plane of the
membrane.
◉ A bacterium engulfed by a white blood cell through phagocytosis
will be digested by enzymes contained in:
Answer: Lysosomes
◉ Which of the following is a reasonable explanation for why
unsaturated fatty acids help keep any membrane more fluid at lower
temperatures?
Answer: The double bonds form kinks in the fatty acid tails,
preventing adjacent lipids from packing tightly.
2026
◉ The liver is involved in detoxification of many poisons and drugs.
Which of the following structures is primarily involved in this
process and therefore abundant in liver cells?
Answer: Smooth ER
◉ Mammalian blood contains the equivalent of 0.15 M NaCl.
Seawater contains the equivalent of 0.45 M NaCl. What will happen if
red blood cells are transferred to seawater?
Answer: Water will leave the cells, causing them to shrivel and
collapse.
◉ What results from an unequal sharing of electrons between
atoms?
Answer: A polar covalent bond.
◉ According to the fluid mosaic model of cell membranes, which of
the following is a true statement about membrane phospholipids?
A. They can move laterally along the plane of the membrane.
, B. They frequently flip-flop from one side of the membrane to the
other.
C. They occur in an uninterrupted bilayer, with membrane proteins
restricted to the surface of the membrane.
D. They are free to depart from the membrane and dissolve in the
surrounding solution.
E. They have hydrophilic tails in the interior of the membrane.
Answer: A. They can move laterally along the plane of the
membrane.
◉ A bacterium engulfed by a white blood cell through phagocytosis
will be digested by enzymes contained in:
Answer: Lysosomes
◉ Which of the following is a reasonable explanation for why
unsaturated fatty acids help keep any membrane more fluid at lower
temperatures?
Answer: The double bonds form kinks in the fatty acid tails,
preventing adjacent lipids from packing tightly.
