aspect describes the behavior of the membrane as the temperature is lowered B) Only phospholipids are capable of moving in the membrane C) The fluid aspect of the membrane is due to the behavior of phospholipids, and the mosaic aspect is due to the presence of carbohydrates D) The fluid aspect of the membrane is due to the lateral and rotational movement of phospholipids, and embedded proteins account for the mosaic aspect E) The mosaic aspect of the membrane is due to the glycosylation of phospholipids on the cytoplasmic side of the membrane Which of the following molecules is most likely to passively diffuse across phospholipid bilayer the plasma membrane? A)oxygen B)glucose C) sodium ion D) DNA E) Hemoglobin Which of the following would be LEAST likely to diffuse through a plasma membrane without the help of a transport protein? A) dissolved gases such as oxygen or carbon dioxide B) a small, nonpolar molecule C) a large, nonpolar molecule D) a large, polar molecule E) Any of the listed molecules would easily diffuse through the membrane Which of the following statements about diffusion is true? A) It involves only the movement of water molecules B) It requires expenditure of energy by the cell C) It is a passive process D) It occurs when molecules move from a region of lower concentration to a region of higher concentration E) It always requires integral proteins of the cell membrane When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur? A) The cell will burst B) The cell membrane will lyse C) Plasmolysis will shrink the interior D)The cell will become flaccid E)The cell will become turgid Which of the following is a correct difference between active transport and facilitated diffusion? A) Active transport involves transport proteins, and facilitated diffusion does not B) Facilitated diffusion requires carrier proteins, but active transport requires channel proteins C) Facilitated diffusion can move solutes against a concentration gradient, and active transport cannot D) Active transport requires energy from ATP, and facilitated diffusion does not E) Facilitated diffusion involves transport proteins, and active transport does not Which of the following factors would tend to increase membrane fluidity? A) a greater proportion of saturated phospholipids B)a lower temperature C) a greater proportion of unsaturated phospholipids D)a relatively high protein content in the membrane E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
aspect describes the behavior of the membrane as the temperature is lowered B) Only phospholipids are capable of moving in the membrane C) The fluid aspect of the membrane is due to the behavior of phospholipids, and the mosaic aspect is due to the presence of carbohydrates D) The fluid aspect of the membrane is due to the lateral and rotational movement of phospholipids, and embedded proteins account for the mosaic aspect E) The mosaic aspect of the membrane is due to the glycosylation of phospholipids on the cytoplasmic side of the membrane Which of the following molecules is most likely to passively diffuse across phospholipid bilayer the plasma membrane? A)oxygen B)glucose C) sodium ion D) DNA E) Hemoglobin Which of the following would be LEAST likely to diffuse through a plasma membrane without the help of a transport protein? A) dissolved gases such as oxygen or carbon dioxide B) a small, nonpolar molecule C) a large, nonpolar molecule D) a large, polar molecule E) Any of the listed molecules would easily diffuse through the membrane Which of the following statements about diffusion is true? A) It involves only the movement of water molecules B) It requires expenditure of energy by the cell C) It is a passive process D) It occurs when molecules move from a region of lower concentration to a region of higher concentration E) It always requires integral proteins of the cell membrane When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur? A) The cell will burst B) The cell membrane will lyse C) Plasmolysis will shrink the interior D)The cell will become flaccid E)The cell will become turgid Which of the following is a correct difference between active transport and facilitated diffusion? A) Active transport involves transport proteins, and facilitated diffusion does not B) Facilitated diffusion requires carrier proteins, but active transport requires channel proteins C) Facilitated diffusion can move solutes against a concentration gradient, and active transport cannot D) Active transport requires energy from ATP, and facilitated diffusion does not E) Facilitated diffusion involves transport proteins, and active transport does not Which of the following factors would tend to increase membrane fluidity? A) a greater proportion of saturated phospholipids B)a lower temperature C) a greater proportion of unsaturated phospholipids D)a relatively high protein content in the membrane E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
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