The Sulphur containing side chain of cysteine is
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26%
Hydrophilic, highly reactive and capable of reacting with another cysteine
59%
Hydrophobic, highly reactive and capable of reacting with another cysteine
6%
Ampiphilic , highly reactive and not capable of reacting with another cysteine
9%
Ampiphilic , highly reactive and capable of reacting with another cysteine
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Which of the following statements about aromatic amino acids is correct?
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58%
On a molar basis, tryptophan absorbs more ultraviolet light than tyrosine.
25%
Histidine's ring structure results in its being categorized as aromatic or basic, depending on pH.
17%
All are strongly hydrophilic
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The peptide alanylglutamylglycylalanylleucine has:
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6%
a disulfide bridge.
59%
four peptide bonds
22%
five peptide bonds
7%
two free amino groups
7%
no free carboxyl group
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Electrophoretic separation at pH 6 of a sample of polypeptide 1 (mw 100) polypeptide 2 (mw 200) and polypeptide 3 (mw 400) would result in which of the following?
(Note: the isoelectric point of each polypeptide occurs at pH 6)
A. Polypeptide 1 would move the farthest
B. Polypeptide 2 would move the farthest
C. Polypeptide 3 would move the farthest
D. None of the polypeptides would move.
(Note: the isoelectric point of each polypeptide occurs at pH 6)
A. Polypeptide 1 would move the farthest
B. Polypeptide 2 would move the farthest
C. Polypeptide 3 would move the farthest
D. None of the polypeptides would move.
A polypeptide with a net positive charge at physiologic pH (~7.4) most likely contains amino acids with R groups of what type?
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18%
Acidic R groups
67%
Basic R groups
4%
Aromatic R groups
10%
Aliphatic R groups
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Three amino acid that are positively charged at neutral ph are
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12%
R, E, H
78%
K, R, H
9%
H , R, C
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During the formation of the peptide bond which of the following takes place?
A. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
B. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen. atom is lost from its amino group of another amino acid
C. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
D. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
E. None of them
A. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
B. Hydrogen atom is lost from its carboxyl group of one amino acid and a hydrogen. atom is lost from its amino group of another amino acid
C. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydroxyl group is lost from its amino group of another amino acid
D. Hydroxyl group is lost from its carboxyl group of one amino acid and a hydrogen atom is lost from its amino group of another amino acid
E. None of them
In a highly basic solution, pH= 13. the dominant form of glycine is: "
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8%
NH3+-CH2-COO
14%
NH2-CH2-COOH
52%
. NH2-CH2-COO
20%
NH2-CH3 + -COO
6%
NH3+ -CH2-COOH
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The chirality of an amino acid results from the fact that it's alpha carbon:*
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71%
is bonded to four different chemical groups
14%
is in the L absolute configuration in naturally occurring proteins
6%
has no net charge
6%
is a carboxylic acid
3%
is symmetric
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Beneficial for skin, bone and tissue wound healing
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14%
Proline
77%
Leucine
9%
Asparagine
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Three most important glycogenic amino acids
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17%
Tyr ,phe , thr
77%
Gly ,Ala , ser
6%
Ile , val ,pro
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two amino acids with pl values of 6 & 8, can we separate these two amino acids at
a buffer with pH 7.0? If we can which one will separate first?
a buffer with pH 7.0? If we can which one will separate first?
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77%
Yes we can, amino acid with pl 8 will separate first
11%
No we can't
11%
Yes we can, amino acid with pl 7 will separate first
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•A 55 year old man suffers from cirrhosis of the liver.Hehas been admitted to the hospital several times forhepatic encephalopathy.His damaged liver hascompromised his ability to detoxify ammonia.Which ofthe following amino acids can be used to fix ammonia andthus transport and store ammonia in a nontoxic form?