The uptake of l-ascorbate (vitamin C) and its oxidized form, dehydro-l-ascorbic acid DHAA), was evaluated in brush border membrane vesicles isolated from adult human mall intestine. Ascorbate uptake was Na+-dependent and potential-sensitive (Km, 200 imol/L), whereas DHAA transport occurred through Na+-independent facilitated diffusion (Km, 800 µmol/L). f the Vmax of vitamin C import through channels is 401µmol/min/cm?, what import rate would you expect if the lumen contained 133 µmol/L of the version of vitamin C that moves through them?
Enzyme kinetics
In biochemistry, enzymes are proteins that act as biological catalysts. Catalysis is the addition of a catalyst to a chemical reaction to speed up the pace of the reaction. Catalysis can be categorized as either homogeneous or heterogeneous, depending on whether the catalysts are distributed in the same phase as that of the reactants. Enzymes are an essential part of the cell because, without them, many organic processes would slow down and thus will affect the processes that are important for cell survival and sustenance.
Regulation of Enzymes
A substance that acts as a catalyst to regulate the reaction rate in the living organism's metabolic pathways without itself getting altered is an enzyme. Most of the biological reactions and metabolic pathways in the living systems are carried out by enzymes. They are specific for their works and work in particular conditions. It maintains the best possible rate of reaction in the most stable state. The enzymes have distinct properties as they can proceed with the reaction in any direction, their particular binding sites, pH specificity, temperature specificity required in very few amounts.
Import Rate = 401µmol/min/cm2 / 133 μmol/L
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