Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
Facilitated diffusion
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: Facilitated diffusion
5. How can you distinguish between a saturated fat and an unsaturated fat at the molecular level? Saturated and unsaturated fats differ in their chemical structures. Saturated fats have no double bond between molecules, which means there are no gaps and the fat is saturated with hydrogen molecules. On the other hand, unsaturated fats have double bonds, which break up the chain of hydrogen molecules and create gaps, allowing the fats to liquefy at room temperature. Describe the process of facilitated diffusion and active transport Facilitated diffusion is a process of transportation of molecules across cell membrane form an area of high concentration to an area of low transportation through protein channels Active transport is when a protein moves a certain material across the membrane from a region of lower concentration to a region of higher concentration against the concentration gradient using energy. 6. How do large molecules, such as proteins, get into a cell? …show more content…
The electrons come from water molecules, and the energy is first absorbed by pigments known as chlorophylls and carotenoids. The former absorb blue and red light and the later absorb blue-green light. Green and yellow light are not absorbed. Reflections of these types of light make plants appear green. There are many varieties of pigments. They are bonded to proteins which provide pigment molecules with the appropriate orientation and position with respect to each other. After absorption by pigment, light energy is transferred to chlorophylls that are bonded to special proteins. Pigments and protein involved with this actual primary electron transfer event together are called the reaction center. A large number of pigment molecules, collectively referred to as antenna, "harvest" light and transfer the light energy to the I same reaction center. The purpose is to maintain a high rate of electron transfer in the reaction center, even at lower light
During the light reactions is when the sun’s energy is converted into ATP and NADPH, which is chemical energy (Campbell, 1996). This process occurs in the chloroplasts of plant cells. Within the chloroplasts are multiple photosynthetic pigments that absorb light from the sun (Campbell, 1996). Photosynthetic pigments work by absorbing different wavelengths of light and reflecting others. These pigments are divided into two categories: primary (chlorophyll) and accessory (carotenoids) pigments.
This cell membrane plays an important part in Diffusion. Cell membrane and Diffusion Diffusion is the movement of the molecules of gas or liquids from a higher concentrated region to a lower concentration through the partially permeable cell membrane along a concentraion gradient. This explanation is in the diagram shown below: [IMAGE] Turgor When a plant cell is placed in a dilute solution or a less concentrated solution then the water particles pass through the partially permeable membrane and fill the cell up with water. The cell then becomes Turgor or hard. An example of this is a strong well-watered plant.
This occurs when special carrier proteins carry solutes dissolved in the water across the membrane by using active transport. When the concentration gradient can not allow travel from one side of the membrane to the other fast enough for the cell’s nutritional needs, then facilitated diffusion is used. The transport protein is specialized for the solute it is carrying, just as enzymes are specialized for their substrate. The transport protein can be
The only mechanism by which cells can take up glucose is by facilitated diffusion through
Fatty acids such as linoleic acid, linolenic acid and arachidonic acid are known as essential fatty acid because they cannot be synthesized in the body so must be supplied in the food. Human being lacks the ability to introduce double bonds in fatty acids beyond carbons 9 & 10. About 20 different fatty acids are synthesized from the two essential fatty acids linoleic acid and linolenic acid. Omega three fatty acid is synthesized from linolenic acid and omega six fatty acid is synthesized from linolic acid.
The difference between saturated and unsaturated fat or trans fat and polyunsaturated fat is the state it is in at room temperature. Saturated fat is solid at room temperature while unsaturated fat is liquid. The liquid fats are able to interact and provide
They absorb light energy and enable it to be converted into chemical energy which is used by the plants to make glucose and oxygen from carbon dioxide and water. Plants appear to be different colours because of the dominant pigments they contain. These pigments absorb some colours of light and reflect others, for example, the green chlorophylls absorb light from the blue-violet and the red regions of the visible spectrum and reflect green light. This is why plants which contain mostly chlorophylls appear green. Other pigments found in green plants, the yellow, orange and red carotenoids which absorb light only from the blue-violet region of the spectrum, are mostly masked by the more dominant chlorophyll.
When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport. Passive transport is the movement of substances across the cell membrane without any input of energy by the cell. The energy for passive transport comes entirely from kinetic energy that the molecules have. The simplest type of passive transport is diffusion, which is the movement of molecules from an area of high concentration to an area of lower concentration. Diffusion
Glucose is the primary source of energy for the cells and consequently is necessary for all cellular functions that require energy. Facilitated diffusion plays a significant role in the management of concentrations of glucose, both intracellular and extracellular, providing a balance of glucose in the cells that when poorly utilized upsets the body’s homeostasis.
An example of simple diffusion is osmosis. Facilitated diffusion on the other hand is dependant on carrier proteins to transport it across the membrane. Diffusion is essential for many organisms as it is a feature of a number of processes which control and supply vital substances to the body in order for basic survival. A few of these are discussed below. Gas exchange is one of these processes.
Fatty acids are another type of lipid. The common feature of fatty acids is that they are all esters of moderate to long chain fatty acids. Two polyunsaturated fatty acids, linoleic and linoleic, are designated "essential" because their absence in the human diet has been associated with health problems, such as scaly skin, stunted growth and increased dehydration. These acids are also precursors to the prostaglandins, a family of physiologically potent lipids present in minute amounts in most body tissues.
Photosynthesis is a process in plants that converts light energy into chemical energy, which is stored in bonds of sugar. The process occurs in the chloroplasts, using chlorophyll. Photosynthesis takes place in green leaves. Glucose is made from the raw materials, carbon dioxide, water, light energy and oxygen is given off as a waste product. In these light-dependent reactions, energy is used to split electrons from suitable substances such as water, producing oxygen. In plants, sugars are produced by a later sequence of light-independent reactions called th...
The purpose of this lab was to see firsthand the diffusion of a substance across a selectively permeable membrane. Diffusion is the movement of molecules from an area of high concentration to an area of lower concentration until both concentrations are equal, or as you could more professionally call it, equilibrium. This concept is one that we have been studying in depth currently in Biology class.
Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. Osmosis is used to transfer water between different parts of plants. Osmosis is vitally important to plants. Plants gain...
Saturated fats come from animal sources like steak, hamburger and pork. Unsaturated fats are derived from plants. There are also trans fats that are considered poison for the body. They raise the bad cholesterol in your body, and should never be included in a healthy diet. There are also fatty acids like omega-3 and omega-6 that are good for a healthy body.