Name: Unit #3 Test 2018 HSe OH H2N 10. This is the structure of selenocysteine.

Question

Name: Unit #3 Test 2018 HSe OH H2N 10. This is the structure of selenocysteine. How is this amino acid classified based on its functional group associated with a. hydrophobic, non-polar d. hydrophilic basic b. hydrophobic polar c hydrophilic polar c. hydrophilic acidic 11. Which statement about anomers is false? sugars, anoemcrization is referred to as mutarotation and occurs readi ly in solution and is catalyzed by acid and base b. The anomeric centre in hemiacctals is the anomeric carbon C2 e. In hemiketals it is the carbon derived from the carboeyl of the ketone (e.g. C-2 in D-fructose). d. Two anomers are designated alpha (a) or beta (), according to the configurational relationship between the anomeric centre and the anomeric reference anom e. In aldohexoses the anomeric reference atom is the stercocenter that is farthest from anomeric carbon in the ring (the configurational atom, defining the sugar as D or L). HO OH OH OH 12. Identify this molecule a. beta-fructofuranose balpha- glacopyranose .beta-glucopyranose d. alpha- glucopyranose e. alpha-fructofuranose 13. What is the condition when glucose levels become too high? a. hypoglycemia b hyperglycemia c.hypertonic d. hypotonic e.ketoacidosis

Explanation / Answer

ANS 10) Amino acid classified based on its functional group associated with selenium is:

c) hydrophilic polar

because they usually participate in hydrogen bonds as proton donors or acceptors

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ANS 11) a) ALL OF THE ABOVE STATEMENTS ARE TRUE

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ANS 12) The molecule is:

c) beta glucopyranose

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ANS 13) When glucose levels are too high

b) hyperglycemia

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