1. At pH 7, the net charge of lysine isA. -2В. -1С. ОD. +1Е. +22. All 20 amino acids haveA. one chiral carbonВ. one a-carbonC. one carboxyl groupD. ionizable R groupE. neutral charge at physiological pH3. The a helix structure of a polypeptide is maintained byA. peptide bondsB. van der Waal's forceC. hydrogen bondsD. ionic bondsE. disulphide bonds4. Which side chain of the following amino acid is deprotonated at pH 9?A. MethionineB. AlanineC. IsoleucineD. HistidineЕ. Тyгosine5. How many chiral carbons are in the following sugar?А. 1В. 2С. 3D. 4Е. 5 6. Which structure is B-ribofuranose?А.В.ÇH2OHÇH2OHÇH2OHOHHOHHOHOHHС.D.ÇH2OHонОн.O.H.CH2OHHHOHOHOHOHЕ.ÇH2OHонH.H.OHOH7. Which pair of carbohydrates is a C-2 epimer?А.сносноВ.сносноOHOHOHOHOHноно-Hно-HH-OHHOHHO-ноно-но-ноHCH2OHCH2OHCH2OHCH,OHС.D.ÇHOсноCHOсноOHOHHOHHOHно-Hно-но-OHOHонOH-OHOHно--OHно--HCH2OHCH2OHCH2OHCH2OHE.сноÇHOHOHнононо-OHH-OHOHH-OHCH2OHCH2OH

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1. At pH 7, the net charge of lysine is А. -2 В. -1 С. 0 D. +1 Е. +2

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter3: Biological Molecules: The Carbon Compounds Of Life

Section: Chapter Questions

Problem 8TYK: The first and major effect in denaturation of proteins is that: a. peptide bonds break. b. helices...

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Question

1. At pH 7, the net charge of lysine is
A. -2
В. -1
С. О
D. +1
Е. +2
2. All 20 amino acids have
A. one chiral carbon
В. one a-carbon
C. one carboxyl group
D. ionizable R group
E. neutral charge at physiological pH
3. The a helix structure of a polypeptide is maintained by
A. peptide bonds
B. van der Waal's force
C. hydrogen bonds
D. ionic bonds
E. disulphide bonds
4. Which side chain of the following amino acid is deprotonated at pH 9?
A. Methionine
B. Alanine
C. Isoleucine
D. Histidine
Е. Тyгosine
5. How many chiral carbons are in the following sugar?
А. 1
В. 2
С. 3
D. 4
Е. 5

6. Which structure is B-ribofuranose?
А.
В.
ÇH2OH
ÇH2OH
ÇH2OH
OH
H
OH
H
OH
OH
H
С.
D.
ÇH2OH
он
Он
.O.
H.
CH2OH
H
H
OH
OH
OH
OH
Е.
ÇH2OH
он
H.
H.
OH
OH
7. Which pair of carbohydrates is a C-2 epimer?
А.
сно
сно
В.
сно
сно
OH
OH
OH
OH
OH
но
но
-H
но
-H
H-
OH
H
OH
HO-
но
но-
но-
но
H
CH2OH
CH2OH
CH2OH
CH,OH
С.
D.
ÇHO
сно
CHO
сно
OH
OH
H
OH
H
OH
но
-H
но-
но
-OH
OH
он
OH
-OH
OH
но-
-OH
но-
-H
CH2OH
CH2OH
CH2OH
CH2OH
E.
сно
ÇHO
H
OH
но
но
но-
OH
H-
OH
OH
H-
OH
CH2OH
CH2OH

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