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What is needed to facilitate active absorption?
Active absorption requires energy in the form of ATP, carrier proteins or channels in the cell membrane for transporting molecules against their concentration gradient, and an appropriate gradient across the membrane to facilitate movement. Additionally, active absorption may involve specific binding sites on carrier proteins for the molecules being absorbed.
What is active absorption?
requires the input of energy and a carrier protein to move nutrients across a concentration gradient
How does the eukaryotic cells make energy that is requries for its many activities?
it works hard in the cell and its quick
What carrier protein is responsible for absorption of vitamin B12?
Intrinsic factor
Why is absorption necessary?
Absorption is necessary for energy storage
What is the transfer of of energy carried by light waves to particles in matter?
This process is called energy absorption.
The energy carrier NAD is reduced to what substance?
NAD is an energy carrier which is involved in the process of glycolysis. It is reduced to NADH when a hydrogen atom is added.
What is absorption in physics?
Absorption in physics refers to the process by which matter takes in energy or particles from its surroundings. This can occur in various forms, such as the absorption of light by a material, the absorption of sound waves by a medium, or the absorption of energy by an electron transitioning to a higher energy level.
How does the process of absorption contribute to the medium's intake of energy?
The process of absorption allows the medium to take in energy by absorbing and incorporating it into its structure. This absorption of energy helps the medium to increase its internal energy levels and carry out various functions.
What is the main energy carrier in the cell?
The molecule adenosine triphosphate, or ATP, is the energy carrier of the cell.
What three major processes of nutrient absorption must be combined with a carrier molecule for transport?
The three major processes of nutrient absorption requiring a carrier molecule for transport are facilitated diffusion, active transport, and cotransport (symport). These processes are essential for the absorption of nutrients such as glucose, amino acids, and ions in the small intestine. The carrier molecules help transport these nutrients across the cell membrane.
Describe four mechanisms of nutrient absorption from the small intestine?
ABSORPTION is accomplished by one of four mechanisms: 1) Active transport is a process requiring energy (ATP) and a nutrient carrier to move an essential nutrient against a gradient. Most carriers are nutrient-specific, and almost all required nutrients are actively transported. Minerals are the exception, as they require both passive diffusion and carrier-mediated transport. Amino acids are actively transported, but also require a carrier. 2) Passive diffusion is a movement of compounds across the cell membrane so as to equalize the concentration of the substrate on both sides of the membrane. This process applies only to such small molecules as electrolytes, water, and small sugars. It does not apply to such large molecules as starch or large proteins. Almost all the water-soluble nutrients are absorbed in this manner or by osmosis (passive absorption). 3) Facilitated diffusion is a movement of nutrients against a concentration gradient and usually does not require energy, but does require a carrier. Fructose absorption uses a carrier without expending energy pulling water with it upon entering the intestines. 4) Pinocytosis or phagocytosis happens when the absorptive cell engulfs the material. This process is used for fat absorption.
