How is the , Posted 7 years ago. C. Secondary active transport occurs when the movement of one substance is coupled with the passive transport of a second substance. The images shown illustrate the differences in scale of production for two methods of producing thread. By diffusion: glucose will move from solution B to solution A. Biologydictionary.net Editors. If you find an example of where hot or cold water is used for something that might involve diffusion, see if you can try it with the opposite and observe any differences in the results. C. Secondary active transport occurs when the movement of one substance is coupled with the passive transport of a second substance. As an example, while gases and small molecules like methane or water can diffuse freely across a plasma membrane, larger charged molecules like carbohydrates or nucleic acids need the help of transmembrane proteins forming pores or channels. If you knew the answer, tap the green Know box. Also, it is spatially more available than in the case of ATP. A fish that lives in salt water will have somewhat salty water inside itself. Dairy cows must be kept close to farmhouses, as they require daily milking, and milk must be produced close to consumers, as it is highly perishable. The best explanation for the diffusion of plants and animals from their hearths of domestication is option C. Contagious diffusion in the early years was a way of spreading from one person to the other. Describe flow of solvent molecules across a membrane. This is also seen when two liquid reactants are mixed with one another. (a) Osmosis UEE Main-2020 (Septeimbern) (c) Diffusion (b) Reverse osmosis (d) Dialysis 26. A. smooth endoplasmic reticulum If the outside environment of a cell is water-based, and the inside of the cell is also mostly water, something has to make sure the cell stays intact in this environment. Which of the following is the main component of the cell membrane? When the roommate told the Emergency Department doctor what had happened, the doctor quickly began administering IV (intravenous) fluids. Animal cells tend to do best in an isotonic environment, where the flow of water in and out of the cell is occurring at equal rates. Glucose is the most commonly used energy source by human cells because (Points: 1) this is the most abundant macromolecule available for cellular respiration. The plants and animals diffused to a region with climate and geography similar to that of their point of domestication. 1. Which of these components add specialized functions to the plasma membrane? John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, Child Psychopathology - Ch 1 Review questions. Which of the following best explains the economic advantage of the type of farm-produced goods shown in the images? Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. This apparent slowing down is due to the fact that, over time, the larger container begins to have enough iodine gas that some of it will be moving backwards towards the crucible. molecules move through transport proteins that have been activated by ATP. In an antiporter it uses the energy of the ions flowing down their concentration gradient. Divide the following terms into component parts and give the meanings of the complete terms. What Is Diffusion? - Definition, Types & Examples Of Diffusion - BYJUS Which of the following best describes the impacts of the Second Agricultural Revolution? Why does the diffusion of the solute down its concentration gradient release energy? This makes it easier for the dye to get mixed throughout the hot water. Also, think about where you see this happen in other places. Posted 7 years ago. Are these pumps negatively charge since they have a high affinity for the positive ions? Which of the following best explains diffusion? Cytosol is composed of water and other molecules, including enzymes, which are proteins that speed up the cell's chemical reactions. In most biological systems, diffusion occurs across a semi-permeable membrane made of a lipid bilayer. Diffusion is affected by temperature, area of interaction, steepness of the concentration gradient and particle size. What transport process can create a concentration gradient for sodium across the plasma membrane? Through a process of passive diffusion, without the active involvement of any other molecule oxygen passes through the capillary membrane and enters cells. thank you. Here, well look in more detail at gradients of molecules that exist across cell membranes, how they can help or hinder transport, and how active transport mechanisms allow molecules to move against their gradients. In its outward-facing form, the pump switches allegiances and now really likes to bind to (has a high affinity for) potassium ions. Grain farming is an extensive farming practice that can maximize profits in part by lower land costs, lower transportation costs, and imperishability of the product. Which of the following best explains the risks associated with pesticide applications? This results in crenation (shriveling) of the blood cell. Direct link to Dovid Shaw's post how does the antiporter p, Posted 7 years ago. Which of the following organelles will be abundant in liver cells? Image 2 shows an innovation that occurred in the Second Agricultural Revolution, reducing the amount of labor needed and increasing crop yields. To see how well you know the information, try the Quiz or Test activity. Not everything can make it into your cells. C. The SER manufactures proteins for export from the cell. Diffusion is the mixing of substances due to the movement of their particles. The rate of diffusion depends on the nature of interaction between the medium and material. This allows red blood cells to carry oxygen all over your body. An electrical potential difference exists whenever there is a net separation of charges in space. Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration. Imagine this just like a hydroelectric power station uses the energy of water flowing down the waterfall to create electricity. When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Allison Soult, Ph.D. (Department of Chemistry, University of Kentucky). Which of the following is not required for osmosis to occur? In biological systems, diffusion occurs at every moment, across membranes in every cell as well as through the body. You now add the two solutions to a beaker that has been divided by a semipermeable membrane, with pores that are too small for the sugar molecules to pass through, but are big enough for the water molecules to pass through. Here, the cell can't import glucose for free using diffusion, because the natural tendency of the glucose will be to diffuse. This property can be observed even better if the gas has an odor or color. In secondary active transport, the two molecules being transported may move either in the same direction (i.e., both into the cell), or in opposite directions (i.e., one into and one out of the cell). When you've placed seven or more cards in the Don't know box, tap "retry" to try those cards again. Her much more prepared A&P student roommate quickly realized the problem and called an ambulance. Which of the following is not a major function of proteins in the cell membrane? Similarly, the medium in which diffusion occurs could also be in one of the three physical states. The cell membrane allows only large molecules to diffuse into the cell. What happens when body cells are placed in a hypertonic solution? Diagram of a sodium-glucose cotransporter, which uses the energy stored in a sodium ion gradient to transport glucose "uphill" against its gradient. this is in relation to the electrochemical gradient section. to send you a reset link. Which of the following best explains the significance of a similarity among locations where olives, figs, grapes and lemons are grown? Which of the following is the best situation for maintaining homeostasis? Large polar molecules cannot diffuse across a biological membrane B. What process does water use to move across the plasma membrane? If a person is severely dehydrated, their extracellular fluids will become hypertonic to the intracellular fluid. Which of the following is a characteristic of the cell membrane? The plasma membrane is semipermeable, meaning that some things can enter the cell, and some things cannot. What part of the plasma membrane is hydrophobic? Imagine you have a cup that has \(100 \: \text{mL}\) water, and you add \(15 \: \text{g}\) of table sugar to the water. Because of the hydrophilic and hydrophobic nature of the phospholipid, the molecule must be arranged in a specific pattern as only certain parts of the molecule can physically be in contact with water. solute: a substance dissolved in another to form a solution. Which of the following explains why oranges are available. No, because the potassium is highly concentrated in the cell, and so that's where the molecules must go(based on active transport going low concentration to high concentration). On the other hand, facilitated diffusion, as the term indicates, requires the presence of another molecule (the facilitator) in order for diffusion to occur. Secondary active transport involves the movement of water by osmosis into a cell. As time progresses, the differential gradient of concentrations between high and low will drop (become increasingly . Water moves into and out of cells by osmosis. The reaction proceeds towards completion at a faster rate. does the glucose molecule just randomly attach itself to the protein when it's about to transport a sodium ion to the other side? Which of the following statements is best supported by the images? Both farming practices require considerable labor input because the fruit is picked by hand, making it a product of intensive agriculture. molecules move through transport proteins that have been activated by ATP. Intensive agriculture is practiced in a Mediterranean climate. The same gas would diffuse slightly more slowly in a liquid such as water and slowest in a solid. Solved QUESTION 28 Which of the following best explains the - Chegg The cell is therefore not completely permeable. Invention of the plow eased the intensive use of labor, and the innovation of mechanized farm equipment led to improved food production. diffusion: [noun] the state of being spread out or transmitted especially by contact : the action of diffusing. Similarly, the medium in which diffusion occurs could also be in one of the three physical states. Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of higher concentration to an area of lower concentration. Facilitated diffusion is powered entirely by GTP hydrolysis B. Direct link to Sam's post 1) The "sodium/glucose sy, Posted 7 years ago. By what endocytosis process do some white blood cells engulf bacteria? The kinetic energy of the molecules results in random motion, causing diffusion. Water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. Lipids do not mix with water (recall that oil is a lipid), so the phospholipid bilayer of the cell membrane acts as a barrier, keeping water out of the cell, and keeping the cytoplasm inside the cell.
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