Regions \( X, Y \) and \( Z \) affect the properties of cell surface membranes in different ways. Which row shows the effect of each region on the properties of a cell surface membrane? \begin{tabular}{|c|c|c|c|} \hline & \begin{tabular}{c} increases \\ permeability of \\ hydrophobic \\ region \end{tabular} & \begin{tabular}{c} repels polar \\ molecules \end{tabular} & \begin{tabular}{c} attracts water \\ molecules \end{tabular} \\ \hline A & \( X \) & \( X \) & \( Y \) and \( Z \) \\ B & \( Y \) & \( Y \) and \( Z \) & \( X \) \\ C & \( Y \) and \( Z \) & \( X \) & \( Y \) and \( Z \) \\ D & \( Z \) & \( Y \) and \( Z \) & \( X \) \\ \hline \end{tabular} 3. Which statements about the fluid mosaic model of a membrane are correct? 1. The movement of phospholipids in the membrane is reduced if the fatty acid tails are saturated. 2. Glycoproteins in the outer layer of the membrane can move. 3. Channel proteins are lixed in position. A. 1, 2 and 3 B. 1 and 2 only C. 1 and 3 only D. 2 and 3 only 4. Some diseases are linked to a failure in the endoplasmic reticulum (ER). Cells of people with these diseases contain proteins that are folded incorrectly. Some of these proteins are enzymes. Protein synthesis in eukaryotic cells occurs in: A. 708 ribosomes in the nucleus B. 70 S ribosomes on the endoplasmic reticulum C. 80 S ribosomes in the nucleus D. 80 S ribosomes on the endoplasmic reticulum 5. Diffusion is the movement of particles from... A. a higher concentration to a lower concentration. B. a lower concentration to a higher concentration. C. a higher water potential to a lower water potential through a partially permeable membrane. D. a lower concentration to a higher concentration using ATP.
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- **Increases permeability of hydrophobic region**: Typically, this is associated with non-polar or hydrophobic regions. - **Repels polar molecules**: This is characteristic of hydrophobic regions. - **Attracts water molecules**: This is characteristic of Show moreā¦
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a. Brownian motion b. Diffusion c. Filtration d. Hydrostatic pressure e. Hyperosmotic f. Hypoosmotic g. Isosmotic h. Osmosis i. Semipermeable 1. When compared with the cell's fluid, solution X has a higher impermeant solute concentration. 2. When compared with solution Z, the cell has a lower impermeant solute concentration. 3. The movement of water from an area of lower impermeant solute concentration to an area of higher impermeant solute concentration is an example of osmosis. 4. Dye particles spread evenly through water. 5. Starch particles do not pass through a paper membrane. 6. A cell uses energy to "pump" sugar molecules from its external environment. 7. Water in the cell moves out into a concentrated salt solution bathing the cell.
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Which of the following lists the four things that a cell membrane (plasma membrane) is made of? A. amino acids, fatty acids, alkaline inclusions, cholesterol B. carbohydrates, lipids, proteins, vitamins C. phospholipids, proteins, cholesterol, carbohydrates in the glycocalyx D. carbohydrates, fats, proteins, water E. lipids, proteins, carbohydrates, nucleic acids Q2 Which of the following is NOT a function of the cell membrane? A. keep the cytosol inside the cell separate from the extracellular fluid outside the cell B. control cell division C. provides sensitivity to the cell's surroundings D. provides structural support E. control movement of substances into and out of the cell Q3 Which of the following is FALSE? A. Diffusion can move molecules through the phospholipid bilayer or through a channel protein. B. Facilitated diffusion uses carrier proteins. C. Vesicular transport can bring water and solutes into the cell by endocytosis or let them out of the cell by exocytosis. D. Active transport uses pump proteins. E. Osmosis moves water from low water areas to high water areas. Q4 Which of the following is FALSE? A. A plant cell in a hypertonic solution will plasmolyze. B. Both plant and animal cells in isotonic solutions are in their "favorite" natural state. C. A plant cell in a hypotonic solution will be turgid. D. An animal cell in a hypotonic solution will swell and/or lyse. E. An animal cell in a hypertonic solution will crenate. Q5 Imagine that a simulated cell is made using dialysis tubing as the membrane and water mixed with glucose, salt, and protein as cytosol. Imagine that this 16 gram cell is placed in a beaker of distilled water for one hour. After one hour, the cell has gained 3 grams of weight. The beaker solution tests positive for glucose and salt, but tests negative for protein. Which of the following CANNOT be correctly concluded? A. Glucose and salt diffused out of the cell. B. The cell contents would test negative for glucose and salt. C. Water osmosed into the cell. D. The membrane is selectively permeable. E. The cell membrane was not permeable to protein. Q6 Cells are protein factories. Cells that line the inside of the nose and respiratory system called goblet cells make the protein mucin made by fixed ribosomes. The mucin is mixed with water and exported out of the cells onto the surface of the nasal cavity as mucus by secretory vesicles. Which of the following is FALSE? A. Mucin and water are moved by vesicular transport. B. Motor proteins use ATP to move membranous sacs full of water and mucin. C. Goblet cells use exocytosis. D. Vesicular transport is passive Q7 Which of the following lists the name of the organelles/structures, in order, that do the following things: makes the cell membrane the right thickness and can patch holes in the membrane carbohydrates on the outside of the membrane that can receive molecules, help cells stick to each other or form slime capsules around cells provides a water-resistant barrier that stops water and other polar molecules from moving into and out of the cell A. phospholipid bilayer, structural proteins, glycocalyx B. cytoskeleton, receptor proteins, cytoplasm C. cholesterol, glycocalyx, phospholipid bilayer D. motor proteins, anchoring proteins, recognition proteins E. cytoplasm, glucose bilayer, nuclear membrane
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