When a hydrophobic substance like a hydrocarbon is dissolved in water, a clathrate cage of ordered water molecules is formed about it. If we consider only the effects on water, what do you expect the sign of ∆S to be for this process? Explain your answer.
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When a hydrophobic substance like a hydrocarbon is dissolved in water, a clathrate cage of ordered water molecules is formed about it. If we consider only the effects on water, what do you expect the sign of ∆S to be for this process? Explain your answer.
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- When a hydrophobic substance like a hydrocarbon is dissolved in water, aclathrate cage of ordered water molecules is formed about it (as shown). If we consider only the effects on water, what do you expect the sign of ΔS to be for this process? Explain your answer.Solution A contains 100 mmol/L glucose and Solution B contains 50 mmol/L NaCl. Assume that gNaCl is 2.0, σglucose is 0.5, and σNaCl is 0.8. If a semipermeable membrane separates the two solutions, what is the direction of water flow across the membrane?How are detergent molecules similar to phospholipid molecules in plasma membranes? Explain the mechanism that makes it possible for detergent molecules to get oil out of clothes. Include the terms hydrophobic and hydrophilic in your explanation.
- The pH vs charge graph for a triprotic amino acid is shown below. Please answer the following questions about the amino acid. 2 1.5 1 0.5 -0.5 -1 4 8 10 12 14 pH a. Which of the following triprotic amino acids is this? Histidine b. What is the isoelectric point? (Please select the appropriate range in which the isoelectric point falls) (Hint - look up the pka values in the pKa table for amino acids, which was in video one of today's lecture) 7-8 c. What form of this amino acid dominates at a pH of 8? Please select the correct form for each jonizable group. Alpha amino NH3+ Alpha carboxyl СОО- R| NH Net ChargeMatch the following terms (A to F) with the statements (i – vi) below by selecting from the drop-down menus. Each choice may be used once, more than once, or not at all. A nonpolar covalent bond B polar covalent bond C ionic bond hydrogen bond E hydrophobic interaction F All of the above (1) Explains most specifically the attraction of water molecules to each other (i) Important for self-assembly of membranes (iii) Important in large biological molecules (iv) Joins backbone atoms in fatty acids (v) Easily disrupted in presence of water (vi) Important for alpha helix and beta sheet formation in proteinsAmino acids are the building units of proteins. These compounds contain at least one amino group and a carboxyl group. Glycine exists in three possible types, depending on the pH of the solution. Fully protonated: Dipolar ion: Completely ionized: pH 1.0; Predict which structure of glycine might be dominant at pH 7.0 and pH 12.0. The pKa value of the carboxyl group is 2.3 and the ammonium group is 9.6.Please explain.
- Which of the following statements is correct regarding polar/nonpolar molecules? 1. Molecules comprised of nonpolar covalent bonds are likely to be hydrophilic 2. Polar molecules like sugar tend to dissolve in solutions of other polar molecules like water 3. Nonpolar molecules like sugar tend to dissolve in solutions of polar molecules like water 4. Polar covalent bonds tend to form between molecules that consist of two atoms of the same element, like oxygen gas (O2) or nitrogen gas (N2)Based on how the water molecules are surrounding the two ions (labeled A&B), you can tell that (highlight or bold your response): lon A is (positive | negative | neutral) b. lon B is (positive | negative | neutral) If ions A and B were bonded together, what type of bond would they share? а. C.The kidneys function to eliminate ammonia from the blood. Based on ammonia’s pK value, what is the molecular form that predominates in the blood? Could this molecule easily diff use through the hydrophobic lipid membrane of a kidney cell? Explain.
- Aspirin is a weak acid with a pKa of 3.5 (the ionizable H is shown in red):It is absorbed into the blood through the cells lining the stomach and the small intestine. Absorption 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? Clearly justify your choice.Consider two proteins, A and B, that can interact with a Ka = 2.55 nM. If you mix the two proteins so that their initial concentration are [A] = 0.10 nM and [B] = 3.0 nM, what percentage of free A do you expect to observe after the solution reaches the equilibrium? 85% 33% 46% 54%In a 0.1000 M acetic acid solution at 25 degrees celsius , the acid ionizes to the extent of about 1.34 %. Since each molecule of acetic acid which ionizes produces 1 H+ ion and 1 C2H3O2- ion, the concentration in the solution are: HC2H3O2 < -----------> H+ + C2H3O2-