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- pump will stop if U a) no potassium ions are available. O b) ATP is hydrolyzed. C) there are too many sodium ions d) hydrogen ions are pumped into the extracellular fluid.Which of the following statements about the sodium-potassium pump is correct? A) Both sodium and potassium move down their concentration gradient across the membrane B) 2 sodium ions are pumped out of the cell against their concentration gradient C) The sodium-potassium pump is a type of cotransport. D) ATP is used as an energy source1. 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…
- Diffusion means that a) smaller particles move across the membrane faster. b) all particles cross a membrane. c) particles move around until they are distributed evenly. d) particles stop when they are halfway across the membrane.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?Our cells need glucose for energy. When blood glucose is low, glucose must still be moved into our cells against its concentration gradient, using energy from ion gradients. The process used to bring glucose in under these conditions is: a) facilitated diffusion through a channel b) secondary active transport c) osmosis d) facilitated diffusion through a carrier e) primary active transport
- 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…a) Matching Questions. Use the following to answer Questions 1–4: Choose the correct answer from the list below. Not all of the answers will be used. a) glycolipidsb) selective permeabilityc) lateral diffusion d) amphipathice) 16 or 18f) acetylsalicylic acid (aspirin) g) cholesterolh) lipid rafti) hydropathyl) 20 or 24 1. ____________ This is the number of carbons in most common fatty acids. 2. ____________ This is a term applied to molecules that have both hydrophilic and hydrophobic moieties. 3. ____________ Transport systems confer this important property on membranes. 4. ____________ This is the process by which lipids and proteins move in the membrane bilayer. b) Name and briefly describe the three classes of lipids focusing on their overall structure and chemical composition. Please feel free to use drawings for your descriptions.If a dialysis bag containing 1% sucrose is placed in a beaker containing 25% sucrose, what would you expect to happen? (hint: only water can move in and out os the bag through osmosis, sucrose is too large; this is a hypertonic environment) A) there will be a loss in weight of the bag due to water leaving the bag B) there will be a gain in weight of the bag due to water moving into the bag C) the weight of the bag will remain the same, with water moving in both directions equally D) sucrose will break down and will move into the bag, increasing the weight of the bag
- As molecular weight increases.a). the rate of diffusion remain unchanged.b). the rate of diffusion decreases.c). the rate of diffusion increases.d). the rate of diffusion stops.Which of the following arrangement based on the increasing order of motion is correct?a) Uncatalysed transverse motion, transverse diffusion catalyzed by flippase, uncatalysed lateral diffusionb) Uncatalysed lateral diffusion, uncatalysed transverse motion, transverse diffusion catalyzed by flippase,c) Uncatalysed transverse motion, uncatalysed lateral diffusion, transverse diffusion catalyzed by flippased) Transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion, uncatalysed transverse motion,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