Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)? bicarbonate chloride sodium calcium E. magnesium
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Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)?
- bicarbonate
- chloride
- sodium
- calcium
E. magnesium
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- Which of the following positively-charged ions is about 10,000 times more concentrated outside the cell than inside (useful in muscle contraction, and in signal transduction of neurons)? bicarbonate chloride sodium calcium magnesiumMixtures of amino acids can be analyzed by first separating the mixture into its components through ion‑exchange chromatography. Amino acids placed on a cation‑exchange resin containing sulfonate (−SO−3)(−SO3−) groups flow down the column at different rates because of two factors that influence their movement: (1) ionic attraction between the sulfonate residues on the column and positively charged functional groups on the amino acids, and (2) aggregation of nonpolar amino acid side chains with the hydrophobic backbone of the polystyrene resin. Note that the ionic attraction is more important than hydrophobicity for this column media. For each pair of amino acids, identify which will be eluted first from a cation‑exchange column using a pH 7.0pH 7.0 buffer.When 2.43 g of a nonelectrolyte solute is dissolved in water to make 435 mL of solution at 25 °C, the solution exerts an osmotic pressure of 895 torr. What is the molar concentration of the solution? concentration: 0.045 M Incorrect How many moles of solute are in the solution? moles of solute: 0.034 mol Incorrect What is the molar mass of the solute? molar mass: 69.12 g/mol Incorrect
- The oligopeptide GEHRKDYWCM was isolated from blood plasma. Calculate its net charge to the nearest 0.01 at pH 7.6. Show all calculationsThe normal range of the sodium electrolyte in the body is 134 to 145 mEq/L. The term mEq is dependent on the charge of the ion. Since sodium is a +1 ion, 134 mEq/L is the same as 134 mmol/L. An ion that has a greater positive or negative charge; however, will have 1 mEq for each positive or negative charge of the ion for every 1 mmol. For example, for Ca+2, 2mEq/1mmol. If the standard range of Magnesium in the body is 0.70 to 0.95 mmol/L, convert this value into mEq/L for the Mg2+ ion. (Use dimensional analysis to figure this out)Draw a palmitoyl ceramide with an ethanolamine head group. Identify each component of the molecule, highlight any charges and point out where in relation to a biological membrane these components would be located.
- A water solution contains 60% Na2S202 together with 1% soluble impurity. Upon cooling to 10°C, Na2S202 • 5 H2O crystallizes out. The solubility of this hydrate is 1.4lb Na2S202 • 5 H20/lb free water. The crystals removed carry asadhering solution 0.06 lb solution/lb crystals. When dried to remove the remaining water (but not the water of hydration), the final dry Na2S202 5 H20 crystals must not contain more than 0.1% impurity. To meet this specification, the original solution, before cooling, is further diluted with water. On the basis of 100 Ib of the original solution,calculate (a) the amount of water added before cooling, and (b) the percentage recoveryof the Na2S202 in the dried hydrated crystalsAn appropriate biochemical buffer should have charges in both its conjugate acid and conjugate base form. This avoids the presence of a neutral form of the buffer that might be able slowly leak into cells. Does unmodified dimethylpiperazine meet this criterion when buffering at pH 8? O Yes No What about buffering at pH 4? D Yes NoThe hydrolysis of the disaccharide sucrose results in the formation of the monosaccharides glucose and fructose, and the AG of this reaction is -29.3 kJ/mol. Sucrase is an enzyme that is able to catalyze the hydrolysis of sucrose. Which of the following statement(s) correctly describes what would happen if you added the enzyme sucrase to a solution of sucrose? All of the other three statements are correct. The activation energy of the reaction would increase. The AG of the reaction would become more negative (i.e., a larger negative number). The rate of sucrose hydrolysis would increase.
- Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? the curve is attached below.Ag+ , K+ , Pb2+, Zn2+ : Classify the Bronsted-Lowry acidity of these cationsThe substance to be analyzed – is white, highly soluble in water salt. When interacting with concentrated sulfuric acid – evolving of some gas with pungent odour can be observed. Reaction with zinc uranyl acetate leads to formation of yellow crystals, which have tetrahedral geometry. Interaction with water solution of silver nitrate leads to formation of white curdy precipitate, which soluble in saturated ammonium carbonate solution. What kind of salt is this? NaCl Na,SO3 NH4 NO3 KBr