What is the process by which water molecules cross a membrane and move from an a
ID: 150651 • Letter: W
Question
What is the process by which water molecules cross a membrane and move from an area of low solute concentration to an area of high solute concentration? 1. a. Diffusion b. Osmosis c. Tonicity d. Plasmolysis 2. Which of the following molecules is most abundant in the plasma membrane? a. Phospholipids c. Carbohydrates d. Proteins b. Cholesterol solution will absorb water from its environment. b. Hypotonic 3. A cell in a(n) a. Hypertonic c. Isotonic d. Turgid 4. Which of the following macromolecules is NOT incorporated into the plasma membrane? a. Lipid b. Carbohydrate c. Polypeptide d. Nucleic acid Channel proteins are an example of which type of protein? a. Enzyme 5. b. Peripheral c. Carrier d. Transmembrane What is the name of the model that describes our current understanding of cell membrane structure and function? 6. a. Fluid dynamics model b. Osmosis mosaic model c. Fluid mosaic model d. Phospholipid mosaic model Which of the following are ways in which a cell can modify its plasma membrane in response to very hot temperatures? Circle all that apply. 7. a. Cells cannot modify their plasma membrane to cope with hot conditions b. Cells can add cholesterol to the membrane. c. Cells can modify phospholipids to give them unsaturated fatty acid tails. d. Cells can modify phospholipids to give them saturated fatty acid tails. 8. Which of the following would happen to a cell in a hypertonic solution? a. The cell would lose water faster than it gained it, causing the cell to shrivel. b. The cell would gain water faster than it lost it, causing the cell to burst. c. The cell would lose water faster than it gained it, causing plasmolysis. d. A or C could occur, depending on whether the cell was a plant or animal cell. e. None of these would occur.Explanation / Answer
ANSWER 1 - Osmosis is correct answer.
Osmosis is the movement of solvent molecules from the region of low solute concentration to the region of high solute concentration through a selectively permeable membrane.
ANSWER 2 - Phospholipids is correct answer.
Plasma membrane is generally made up of phospholipid bilayer in which proteins are embedded randomly. These two are major components of plasma membrane. Phospholipids are compared to the sea and proteins are compared to the icebergs floating in the sea. Phospholipid forms the major component of plasma membrane.
ANSWER 3 - Hypotonic is correct answer.
A cell placed in hypotonic solution ( less concentrated solution than cell cytoplasm ) will absorb water from it by the process of osmosis.
ANSWER 4 - Nucleic acid is right answer.
Plasma membrane mainly consists of phospholipids and proteins. Nucleic acid is mainly localised in nucleus. It is completely absent in plasma membrane.
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