14. Pyridoxine is a water soluble organic substance that is not synthesized by h

Question

14. Pyridoxine is a water soluble organic substance that is not synthesized by humans. It is chemically converted to Pyridoxal Phosphate which is required by aminotransferase enzymes that catalyze chemical changes of amino acids. Which of the following statements is correct? a. Pyridoxal Phosphate is a transferase enzyme. b. Pyridoxine is a coenzyme. Pyridoxine is a vitamin C. Pyridoxal Phosphate is a vitamin e. None of the above is correct. Optimum pH 15. Consider the pH profile of pepsin shown to the right. What can be concluded about the catalytic residue in the active site of pepsin? The catalytic residue is probably a Histidine residue. The catalytic residue is probably an Aspartic acid residue and the active form Enzyme of this residue is the protonated form. activity c. The catalytic residue is probably a Glutamic acid residue and the active form of this residue is the deprotonated form.. d. The catalytic residue is probably a protonated N-terminal amino group which acts as a nucleophile e. None of these. There is not enough information to make a conclusion. 1 3 5 7 pH 16. Which of the following is correct concerning the structure of the compound shown to CH2OH the right? a. This is a "reducing" sugar OH b. This disaccharide is not digested in humans and serves as roughage in our diet. c. This disaccharide contains a pentose. d. This sugar is not water soluble because it contains a B glycoside bond. CH2OH e is of this sugar produces equimolar amounts of D-Glucose and D Fructose, sometimes referred to as "invert sugar. CH2OH OH

Explanation / Answer

14) option-c is right answer

pyridoxine is also known as vitamin B6.

15) option - b and c are right answer

glutamic acid and aspartic acid are catalaytic residues of active site of pepsin. In the pepsin type aspartic proteinases, the two catalytic aspartyl residues are propesed to work in concert, one (with lower pKa) as deprotonated form and the other (with higher pKa) as a protonated form.

16) option - e is correct answer

the hydrolysis reaction of sucrose is splitting the disaccharide sucrose into D-glucose and D-friuctose. this mixture is called as invert sugar syrup.

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