Aspirin is a weak acid with a pKA of 3.5. When aspirin donates its proton it becomes negatively charged. It is absorbed into the blood through the cells lining the stomach and the small intestine. Absorption of aspirin requires passage through the plasma membrane, the rate of which is determined by the polarity of the molecule: charged and highly polar molecules pass slowly, whereas neutral hydrophobic ones pass rapidly. The pH of the stomach contents is about 1.5, and the pH of the contents of the small intestine is about 6. Is more aspirin absorbed into the bloodstream from the stomach or from the small intestine? Explain your answer.

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A: The proteins are composed of twenty naturally occurring amino acids. The net charge on an amino acid…

Q: viscosity

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Q: List all the amino acids you would expect to bind to a cation-exchange column at pH 2.

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Q: Which of these decapeptide is the most hydrophobic?

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Q: 2. You made a pH=9.8 buffer solution by mixing NaOH and glycine to give a solution that is 0.20 M in…

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Q: The following are pairs of fatty acids. Select the fatty acid that has the HIGHER MELTING POINT. FA…

A: Fatty acid is a crucial part of lipids, which are the parts of living things including plants,…

Q: None

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Q: Which of these compounds is most soluble in water at pH 7.0? (Note that the non- ionized forms are…

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A: Serum albumin is produced in the liver, dissolves in plasma, and is the most abundant blood protein…

Q: 70 degree Celcious is the melting point of stearic acid, and 4 degree Celcius is the melting point…

A: Fatty acids (FA) are the building blocks of the fat present in our bodies or we eat. Fats breakdown…

Q: Match the following descriptions with the correct lipid-based compounds: v Cholesterol A. usually…

A: Lipids are not polymers. The simplest form of lipid is fatty acids which are a long chain of…

Q: Name two glycerophospholipids found in eukaryotic cell membranes and two sphingolipids. What…

A: Phospholipids are amphipathic molecules composed of fatty acids, phosphate, alcohol group (not…

Q: Given a stock protein solution with a concentration of 3 mg/ml, determine the protein concentration…

A: Stock solutions are used in many laboratory procedures, in order to save space for keeping larger…

Q: hosphate buffered saline (PBS) is a buffer solution commonly used in biological The buffer helps to…

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Q: Uncharged molecules can passively pass through membranes more readily than charged molecules.…

A: An acid dissociation constant  (Ka) is a quantitative measure of the strength of an acid in the…

Q: Protein solubility in aqueous solutions is independent of ionic strength of the solution.  True or…

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Q: Why does adding acetic acid to the milk improve the extraction efficiency of the pentobarbital? You…

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Q: In the Nernst equation [V = 62 log10 (Co/ Ci)], the term Co represents: the intracellular…

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Q: You are studying the effects of temperature and lipid composition on membrane fluidity using…

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Q: "hich of the statements are true? Fats that contain more unsaturated fatty acid residues than…

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Q: The pH level of the human blood must be maintained at a pH within 7.35-7.45. Excess acidity or…

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Q: MECHANISM for the plasma polymerization of oxalic acid.

A: Polymerization : During polymerization,smaller molecules called monomers or building blocks are…

Q: An important buffer system in the human body involves carbon dioxide (CO2), carbonic acid (H2CO3),…

A: The hydrogen atom that is involved in a chemical bond or chemical reaction can easily lose its…

Q: The inclusion of metal ions in protein composition  Inactivates enzymes destroys prothis destroys…

A: A chemical reaction is an equation which represents interaction between substrates to form products.

Q: Solution A: 200 mM glucose; solution B: (100 mM NaCl + 50 mM KCl). Which of these two solutionswill…

A: The objective of the question is to determine which of the two given solutions will have the highest…

Q: In an experiment, a 0.001 (mole fraction) solution of polysaccharide in water is made and is placed…

A:

Q: For the amino acid arginine: Draw its complete protonic equilibria. Indicate the net charge of each…

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Q: What is the one letter code for this amino acid? What is the pH range that this amino acid will…

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Q: Lysine is a polar, basic amino acid. Which of the following is the closest to the expected…

A: Isoelectric pH/ isoelectric point: For each amino acid there is a particular pH value at which the…

Q: The substance to be analyzed interacting with concentrated sulfuric acid – evolving of some gas with…

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Q: direction of water flow across the membrane

A:

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Q: 1) If the pH of the rain drops from 6 to 5 due to air pollution, the rain has become: a) two time…

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Q: The transport of aspirin (pKa = 3.5, structure shown here) from the digestive tract to the…

A: Aspirin is a drug that causes the pH to drop. Its pKa is 3.5, and it works as a weak acid.

Q: centration Depicted below IS add one mole of each of the molecules as shown below. The molecule to…

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Q: Draw a palmitoyl ceramide with an ethanolamine head group

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Q: A. Given the 7 proteins in the table, will they all be separated properly using isoelectric…

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Q: QUESTION: What are the buffer regions/effective pH range?

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Q: Oils can be converted to fats by a commercial process catalyzed by nickel which is called partial…

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Q: Determine the pKa of the amino acid using the graph graph attached:

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Q: Which noncovalent interactions (discussed in Section 8.2) are responsible for the cohesion of lipid…

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Nutrition and Digestion

The process of consuming nutrients to utilize them for various biological purposes is known as nutrition. The substances absorbed from food are known as nutrients. They serve different important functions in the body, such as repairing wounds and damages, generating energy for metabolism, and regulating biochemical reactions.