16- Which statement is not true for transportation process across cell membrane? a) O The membrane proteins are specialized on the transportation process by providing a selective passage for substances b) O The concentration gradient is an important driving source C) The metabolic waste is eliminated through the diffusion across the cell membrane d) CO2 and 02 can not simply diffuse the cell membrane

16- Which statement is not true for transportation process across cell membrane? a) O The membrane proteins are specialized on the transportation process by providing a selective passage for substances b) O The concentration gradient is an important driving source C) The metabolic waste is eliminated through the diffusion across the cell membrane d) CO2 and 02 can not simply diffuse the cell membrane

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 24CTQ: Discuss why the following affect the rate of diffusion: molecular size, temperature, solution...

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11. Determine whether the following statements are true or false. If they are false, provide a rewording that would correct the statement. a) Secondary active transport requires a direct source of ATP to operate b) Secondary active transport cannot operate without primary active transport first setting up a gradient c) The GLUT is an example of facilitated diffusion d) The SGLT is an example of an antiporter
While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B - cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal…
Glucose transport across cell membranes varies depending upon blood glucose levels. When glucose levels are high, glucose transport is accomplished via membrane transporters. When glucose concentrations are low, the transport of glucose across the membrane is dependent upon the sodium ion concentration. What types of transport is observed for glucose? A)simple diffusion at high [glucose], secondary active transport at low [glucose] B)facilitated diffusion at high [glucose], secondary active transport at low [glucose] C)simple diffusion at high [glucose], primary active transport at low [glucose] D)facilitated diffusion at high [glucose], primary active transport at low [glucose]
1.) Select/highlight the statements that are TRUE regarding simple diffusion. a) It is a form of passive transport. b) It is how glucose travels across the cell membrane C) It is used to transport larger molecules such as polysaccharides. d) It is the method used to transport small, nonpolar molecules. 2.) What is the name of the process occurring in the diagram below and additionally, what is the name given to the condition/outcome/state created on the right side of the diagram below?
Match the definitions with the words: Direct Diffusion, Facilitated Transport, Active Transport a) passive movement of molecules through a protein channel, down the solute's concentration gradient b) using a vesicle to move many molecules into a cell c) movement of molecules through a protein transporter, requires ATP, against the solute's concentration gradient
Define the terms (i) facilitated diffusion, (ii) primary active transport and (iii) secondary active transport. Identify which of these transport types the following are examples of: a) ATP/ADP translocase b) K^+ channels c) Bacteriorhodopsin
1. Simple diffusion across membranes is faster for which type of molecules? a)Lipophilic substances b)Hydrophilic substances c)Amphipathic substances d)Polar molecules 2. One of the following is true of active transport? a)Substances diffuses following its concentration gradient b)Substances passively diffuse against its concentration gradient c)Energy is used to transport substances against its concentration gradient d)The movement of an ion down its electrochemical gradient is coupled with transport of another molecule against its concentration gradient 3. What happens to the volume of a red blood cell that is placed in a hypertonic solution. a)It shrinks b)volume does not change c)Volume increases 4. What was the effect of excessive water consumption on the osmolarity? a)It decreased b) It increased 5. A protein that is in a secondary structure has one of the following characteristics a)Amino acids of a single peptide chain are bound to each other by five different types of…
4) Two membrane preparations have been made from the plasma membrane of erythrocytes (i.e red blood cells) and are being maintained in an isotonic buffer solution: (1) right-side-out membrane vesicles, in which the exoplasmic leaflet of the vesicle faces the buffer (equivalent in orientation to that of the exoplasmic leaflet of the intact plasma membrane); and (2) inside-out membrane vesicles in which the exoplasmic leaflet faces the interior of the vesicles and the cytoplasmic leaflet faces the buffer. 80 a. Right-side-out vesicles (ROVS) Very Low Fluorescence Inside-out vesicles (IOVS) Very High Fluorescence A newly discovered phosphoglyceride, called phosphotidylalanine is currently being studied. Annexin V is a protein that binds to phosphatidylalanine, which is one of the phospholipids present in the cell membrane preparations described above. Fluorescently labeled Annexin V is mixed with each vesicle preparation. The vesicles are washed to remove unbound Annexin V and then…
Which of the following statements is correct about passive diffusion? Select one: A) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). B) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). C) It requires an expenditure of energy by the cell. D) It may require a transport protein. E) It involves movement of molecules down a concentration gradient and may require a transport protein.
Describe facilitated diffusion, primary and secondary active transport, and group translocation in terms of their distinctive characteristics and mechanisms. What advantage does a bacterium gain by using active transport rather than facilitated diffusion?
11. Which of the following would indicate that facilitated diffusion was taking place? A) A substance was moving from a region of low concentration into a region of higher concentration. B) Substances were moving against the diffusion gradient. C) A substance was slowing as it moved down its concentration gradient. D) ATP was being rapidly consumed as the substance moved. E) A substance was diffusing much faster than the physical condition indicated it should. 12. Osmosis, the diffusion of water is distinct from the diffusion of oxygen because water is a solvent. b. water is non-polar. water is a large molecule. d. oxygen is a dissolved gas. oxygen is highly polar. а. с. е. 13. Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are A) hypertonic to both fresh water and the salt solution. B) hypotonic to both fresh water and the…
16. Which of the following best defines the term "exocytosis"? A) The discharge of proteins in cytoplasmic vesicles from a cell following fusion of the vesicles with the plasmalemma B) Diffusion of lipid-soluble molecules from a cell across the cell membrane C) The uptake of material at one domain of a cell's surface and its discharge from the opposite side of the cell D) The discharge of ions or small molecules from a cell by protein pumps in the membrane E) The process by which proteins move from one cytoplasmic compartment to another