Select the statements that are true about ions and how they interact with membranes and their components. They interact well with polar molecules. They can easily cross the plasma membrane without the help of special transport proteins. They are repelled by the hydrophobic interior of the lipid bilayer.
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Which of the following statements describes the interaction of water molecules with phospholipids? The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). Phospholipids do not interact with water because water is polar and lipids are nonpolar. The polar heads interact with water; the nonpolar tails do not. Phospholipids dissolve in water. An organism with a cellulose cell wall would most likely be unable to take in materials through which of the following processes? osmosis phagocytosis facilitated diffusion active transport A cell with a high level of smooth endoplasmic reticulum is most likely specialized to carry out which of the following processes? storage of large quantities of water import and export large quantities of protein active secretion of large quantities of protein synthesis of large quantities of lipids Which of the following statements best describes a characteristic feature of integral membrane proteins? They are localized to the interior surface of the membrane. They are hydrophobic. They are hydrophilic. They are amphipathic, with at least one hydrophobic region.
Suman K.
Ions and charged molecules do not interact well with portions of the phospholipid bilayer of the cell membrane. Because of this: Ions very easily diffuse through a phospholipid membrane. Ions are not at all important for human life. Ions cannot diffuse through a phospholipid membrane. Ions are attracted to a phospholipid membrane.
Madhur L.
1. In an experiment involving lipid bilayers, a solution of table salt (sodium and chloride ions in water) is added on the left side of the membrane while pure water is added on the right side. After 30 minutes the researchers test for the presence of ions on each side of the membrane. The right side tests negative for ions. What can you conclude? A) The experiment failed. B) The water somehow blocked the movement of ions across the membrane. C) Ions cannot cross the lipid bilayer because they are hydrophobic. D) Ions cannot cross the lipid bilayer because they are electrically charge. 2. In an experiment involving lipid bilayers, a sugar solution is added on the left side of the membrane while pure water is added on the right side. After 30 minutes the researchers test for the presence of sugar on each side of the membrane. The right side tests negative for sugar. This is because: A) of the nonpolar nature of membranes. B) of the polar nature of membranes. C) sugars cannot cross the lipid bilayer because they are nonpolar D) sugars are hydrophobic. 3. With regard to fatty acids, which of the following is the best explanation for why animal fat is a solid at room temperature while vegetable oils are liquid? A) Vegetable oil has fewer double bonds than animal fats. B) Animal fat has fewer double bonds than vegetable oil. C) Animal fats have shorter fatty-acid tails. D) Vegetable oil has longer fatty-acid tails. 4. Which of the following means of transport would most likely be used for moving a medium-sized molecule (like a monosaccharide or an amino acid) from a low concentration on the outside of a cell to a high concentration on the inside of a cell? A) facilitated diffusion through an ion channel protein B) facilitated diffusion through a transporter protein C) active transport through a "pump" protein D) passive transport 5. Integral membrane proteins stay in membranes because of ______. A) osmotic pressure from proteins outside the cell B) diffusion of proteins from the cytoplasm to the membrane C) the locations of their polar and nonpolar amino acids D) their small size, which does not allow them to pass through the membrane 6. Which one of the following statements are true? A) Transverse movement of membrane proteins and lipids cannot occur across the lipid bilayer spontaneous (without using external energy).
Supreeta N.
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