A polypeptide with a net positive charge at physiologic pH (~7.4) most likely contains amino acids with R groups of what type?
Anonymous Quiz
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
Anonymous Quiz
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: "
Anonymous Quiz
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:*
Anonymous Quiz
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
Anonymous Quiz
14%
Proline
77%
Leucine
9%
Asparagine
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Three most important glycogenic amino acids
Anonymous Quiz
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?
Anonymous Quiz
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?
Phenylalanine hydroxylase converts Phenylalanine into
Anonymous Quiz
69%
Tyrosine
17%
Valine
8%
Leucine
7%
Isoleucine
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Leucine is .
Anonymous Quiz
7%
Semi-essential
16%
Nutritionally nonessential
77%
Nutritionally essential
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Glycine is
Anonymous Quiz
10%
Semi-essential
72%
Nutritionally nonessential
18%
Nutritionally essential
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