Which of the following best describes the process of water entering a cell?
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They are self-marking questions, so you can click on 'check' to see whether you have the answer correct. Show Each question has a helpful note written by an examiner. Great for revision. Teachers can control access to this quiz for their groups in the 'student access' section. Students - If this is an assignment - remember to click the "SUBMIT" button at the end so your teacher can see you have finished. What term refers to a property of fatty acid chains of a phospholipid? Hydrophobic Hydrophilic Amphipathic Polar Long hydrocarbon chains are nonpolar and will not mix with water so are hydrophobic. Check
This student diagram shows the arrangement of molecules in the fluid mosaic model of cell membranes.  Which of the following correctly identifies the labels A to D? A = integral protein, B = cholesterol, C = phospholipid, D = peripheral protein A = integral protein, B = glycoprotein, C = fatty acid tails, D = peripheral protein A = integral protein, B = phospholipid, C = peripheral protein, D = cholesterol A = peripheral protein, B = cholesterol, C = phospholipid, D = integral protein It is important to be able to draw and recognise the components of cell membranes. Check
Which of the following best describes an integral protein? A protein attached to the surface of the membrane A protein within the cytoplasm A protein enclosed in a vesicle A protein embedded in the phospholipid membrane Integral proteins can be transmembrane - going across the membrane to be exposed on both sides - or embedded on one side of the membrane. If an integral membrane is removed, the membrane will be disrupted. Check
Which of the following is the term describing a protein attached to the surface of the membrane? Cytoplasmic protein Peripheral protein Integral protein Transmembrane protein Peripheral proteins can be removed from the membrane without the disruption of the membrane. Check
Cells are able to take in droplets of fluid or small particles from outside of the cell to form vesicles containing this liquid. Endocytosis by the formation of mesosomes Endocytosis by infolding of the plasma membrane Exocytosis leading to endosymbiosis Exocytosis by infolding of the plasma membrane Endocytosis occurs by infolding of the plasma membrane to take in or engulf particles or liquid. Check
Which of the following helps maintain the structure of a cell membrane? Hydrophobic interactions with phosphate heads Hydrophobic interactions between fatty acid chains Hydrogen bonding between water and cholesterol Hydrophilic interactions between water and fatty acids Phospholipids are amphipathic - having both hydrophobic fatty acid chains that repel water and polar heads that are hydrophilic and so attract water. Hydrophobic interactions between the fatty acid chains hold the phospholipid bilayer together. Check
During exocytosis, the following events occur. What is the correct sequence of these events? I. Formation of a vesicle by the Golgi apparatus I, II , III, IV IV, II, III, I I, IV, III, II II, III, IV, I Exocytosis is the release of materials from the cells. Vesicles are made by the Golgi apparatus for exporting from cells. Check
Which part of a plasma membrane is responsible for preventing the free movement of ions into and out of the cell? Glycoproteins Cholesterol Phospholipid bilayer Channel proteins Phospholipids have nonpolar tails in the interior of the membrane which would repel the charged ions. Ions tend to move through channel proteins or by active transport selective pumps. Check
Which of the following describes facilitated diffusion? The passive movement of a particle across a cell membrane via a channel protein. The movement of a particle up a concentration gradient helped by active pumping. The movement of a particle down a concentration gradient helped by active pumping. The passive movement of a particle through the phospholipid bilayer of the cell membrane. Facilitated diffusion is passive transport Facilitated diffusion involves a channel protein. Check
A membrane protein could have which of the following functions? Enzymatic action Thermal insulation Energy storage Oxygen uptake Enzymatic action by immobilised enzymes are critical functions of membranes, so D is correct. Energy storage would be by glycogen in animals or starch in plants. Oxygen uptake is by hemogolobin which is within red blood cells. Thermal insulation is done by layers of fat under the skin not at the membrane level Check
Which statements are characteristics of the diffusion of oxygen through membranes? II and III only I and III only I, II and III I and II only Oxygen molecules are small, non-polar and uncharged. They can pass through the phospholipid bilayer of membranes by simple diffusion. They move from a high concentration to a lower concentration, down a concentration gradient. What is the process of water entering cells?Water enters the cell by osmosis. The cytoplasm pushes against the cell wall and the cell becomes turgid.
Which of the following best describes how water is entering the cell?Answer and Explanation: The correct answer is (d) Water moves through protein-lined channels in the plasma membrane. In order to allow for the optimal movement of water across the plasma membrane into or out of a cell, the membranes contain special proteins called aquaporins.
How does water enter the cell quizlet?Water can enter cells by osmosis. If a cell is in distilled water, it swells up so much that it bursts and dies. (The partially permeable membrane of an animal cell is the cell membrane.) If it is in a concentrated solution, water moves out of the cell by osmosis, causing it to shrivel up and shrink.
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