2. Cirele and label the functional groups found on the following molecule: 1.5 p

Question

2. Cirele and label the functional groups found on the following molecule: 1.5 pts S-H H2N C COOH cysteine Which of these functional groups will be charged in aqueous solution and what will be the charge associated with the functional group(s)? 1 pt In this structure, there will be a-1 charge on COOH, +1 on NH3+ (gives 1 H ion, then will receive 1 H atom in aqueous solution). Which of these functional groups is acting as a base in aqueous solution? 1 pt In this structure, NH2 is acting as a base. 3, 1-4 glycosidic linkages are resistant to hydrolysis, which makes them very resistant to degradation and decay. Which of the following polysaccharides will therefore be resistant to degradation and decay? 1.5 pts b. glycogen c. cellulose e. starch 4. Coffee has a pH value of 5. What is the difference in H+ concentration between coffee and pure water? 1 pt

Explanation / Answer

2.
pK value of side chain in cysteine = 8.33
pK value of amino group = 10.78
pK value of carboxyl group = 1.71

Amino group = +1 charge
Carboxyl group = -1 charge
Amino group acts as a base in aqueous solution.

3.
Beta glycosidic linkages are seen in
a. Chitin
b. Cellulose
c. Peptidoglycan

Starch and cellulose have alpha-glycosidic linkages.

4.
pH of coffee = 5
pH = -log[H+]
[H+] = 1 X 10-5 M

pH of water = 7
[H+] = 1 X 10-7 M

Difference in [H+] concentration = 1 X 10-2 M
Coffe contains more amount of [H+] than water.

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