Biology 1-8 cumulative

Last update by dangkathy04 on 05/03/2014
497330 People have viewed this Quiz
  • Share

Some regions of the plasma membrane, called lipid rafts, have a higher concentration of cholesterol molecules. As a result, these lipid rafts

A) are able to flip from inside to outside.
B) are more fluid than the surrounding membrane.

C) have higher rates of lateral diffusion of lipids and proteins into and out of the lipid rafts.

D) are more rigid than the surrounding membrane.

E) detach from the plasma membrane and clog arteries.

Answer:
D) are more rigid than the surrounding membrane.

View Biology 1-8 cumulative as Flashcard Deck

Related Quiz Content
  • smiraclelynch

    Which of the following types of molecules are the major structural components of the cell membrane?

    A) proteins and cellulose
    B) phospholipids and cellulose

    C) glycoproteins and cholesterol

    D) nucleic acids and proteins

    E) phospholipids and proteins

    E) phospholipids and proteins

  • smiraclelynch

    According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

    A) They are free to depart from the membrane and dissolve in the surrounding solution.

    B) They frequently flip-flop from one side of the membrane to the other.

    C) They have hydrophilic tails in the interior of the membrane.

    D) They can move laterally along the plane of the membrane.

    E) They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.

    D) They can move laterally along the plane of the membrane.
  • smiraclelynch

    The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is

    A) to maintain the integrity of a fluid mosaic membrane.

    B) to mediate cell-to-cell recognition.

    C) to actively transport molecules against their concentration gradients.

    D) to facilitate diffusion of molecules down their concentration gradients.

    E) to maintain membrane fluidity at low temperatures.

    B) to mediate cell-to-cell recognition.

  • smiraclelynch

    Which of the following processes includes all others?

    A) diffusion of a solute across a membrane

    B) passive transport
    C) transport of an ion down its electrochemical gradient

    D) osmosis

    E) facilitated diffusion

    B) passive transport
  • smiraclelynch

    Five dialysis bags, constructed from a semipermeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed.

    Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution 28) at the beginning of the experiment? A) A B) B C) C D) D E) E

    C) C
  • smiraclelynch

    The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same. Refer to the figure to answer the following questions.

    At the beginning of the experiment,

    A) side A is hypertonic to side B.

    B) side A is hypotonic to side B.
    C) side A is hypertonic to side B with respect to glucose.
    D) side A is hypotonic to side B with respect to sodium chloride.

    E) side A is isotonic to side B.

    B) side A is hypotonic to side B.
  • smiraclelynch

    Which of the following plant and animal cells? statements correctly describes the normal tonicity conditions for typical plant and animal cells?


    A) Theanimal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.

    B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.

    C) The animal cell is in a hypertonic solution, and the plant cell is inan isotonic solution.

    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

    E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.


    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

  • smiraclelynch

    Which of the following plant and animal cells? statements correctly describes the normal tonicity conditions for typical plant and animal cells?


    A) Theanimal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.

    B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.

    C) The animal cell is in a hypertonic solution, and the plant cell is inan isotonic solution.

    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

    E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.


    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

  • smiraclelynch

    Which of the following plant and animal cells? statements correctly describes the normal tonicity conditions for typical plant and animal cells?


    A) Theanimal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.

    B) The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.

    C) The animal cell is in a hypertonic solution, and the plant cell is inan isotonic solution.

    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

    E) The animal cell is in a hypertonic solution, and the plant cell is in a hypotonic solution.


    D) The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.

  • smiraclelynch

    Why are lipids and proteins free to move laterally in membranes?

    A) Lipids and proteins repulse each other in the membrane.

    B) The interior of the membrane is filled with liquid water.
    C) Hydrophilic portions of the lipids are in the interior of the membrane.
    D) There are only weak hydrophobic interactions in the interior of the membrane.

    E) Molecules such as cellulose can pull them in various directions.

    D) There are only weak hydrophobic interactions in the interior of the membrane.
  • smiraclelynch

    Which of the following is a characteristic feature of a carrier protein in a plasma membrane?

    A) It exhibits a specificity for a particular type of molecule.

    B) It is a peripheral membrane protein.
    C) It has few, if any, hydrophobic amino acids.

    D) It works against diffusion.

    E) It requires the expenditure of cellular energy to function.

    A) It exhibits a specificity for a particular type of molecule.