Amino Acids
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1
the concentration of hydrogen ion in a solution is expressed as the pH, which is numerically equivalent to
- 1/log [H+]
- ln [H+]
- -log [H+]
2
Which amino acid has a polar, non-ionic group
- Ser
- Tyr
- His
3
Which is classified as non-polar
- all of these
- L
- I
- P
4
Phenylketonuria (PKU) is thought to be a genetic disease caused by
- excess of tyrosine
- deficiency of a phenylalanine transport system
- tyrosinase deficiency
5
Which amino contains a guanido group in its sidde chain
- L
- R
- Q
6
Which amino acid has the one letter symbol K
- Lys
- Phe
- Leu
7
Which amin acid take on a negative charge when R-group loses an atom
- Glu
- Tyr
- His
8
Tyrosine is a precursor of all the following except
- dopamine
- epinephrine
- phenylalanine
9
Which of the following has a net positive charge at physiologic pH
- Proline
- Serine
- Arginine
10
Which amino acid is neither D or L in configuration
- Gly
- Asp
- Ala
11
Which is the N-terminal amino acid in the peptide Ala-Gln-Arg-Ser-His
- His
- Arg
- Ala
12
All are ionizable in proteins, except
- lysine
- glycine
- arginine
13
which of the following statements about solutions of amino acids at physiological ph is true?
- Some amino acids contain only positive charges
- All amino acids contain both positive and negative charges
- All amino acid contain positively charged side chains
14
All of the ff. amino acids contain only methyl or methylene groups as costituents of their side chain except
- alanine
- glycine
- proline
15
- has cis hydrogen and oxygen groups
- has rotational freedom
- Planar
16
Which of the ff. amino acids is nearly always found buried in the center of proteins
- Serine
- Glycine
- Proline
17
Which amino acids can form disulfide bonds
- Proline
- Serine
- Cysteine
18
Group of A.A. with polar side chains
- S, T, V
- S, T, I
- S, T, C
19
Which of the ff. amino acids contains an amide group in its side chain
- Proline
- Glutamine
- Lysine
20
Which A.A. contains indole group in its side chain
- Y
- I
- W
21
In humans all the ff. A.A. are nonessential except
- valine
- cysteine
- proline
22
All describe characteristics of the peptide bond except
- forms a single bond directly linking the alpha-carbon adjacent amino acids
- demonstrate no rotation around the bons
- it is polar but uncharged
23
Which A.A. is not found in proteins
- Proline
- Ornithine
- Glycine
24
Which statement is incorrect about the classification of A.A.
- Glu and Asn are acidic
- Ser and Thr are neutral
- Lys and Arg are basic
25
Which A.A. has aromatic groups on its side chain
- F, Y, W
- F, K, Y
- F, Y, M
26
Which one is actually an imino acid
- Gly
- Asp
- Pro
27
The absolute configuration of amino acids is denoted by its relationship to the L-or D- forms of
- tartaric acid
- glyceraldehyde
- alanine
28
At neutral pH, a mixture of amino acids in solution would be predominantly
- dipolar ions
- nonpolar
- hydrophobic
29
Which is true about glutamine
- contains an amide group
- has E as its one-letter symbol
- classified as acidic
30
Which A.A. contains imidazole group in its sid chain
- H
- Q
- R
31
Which A.A. contains hydroxyl group in its R group
- Serine
- Cysteine
- Glycine
32
All A.A. are found in protein except
- methionine
- cysteine
- homocysteine
33
Which amino acid is most compatible with alpa-helical structures
- alanine
- proline
- tryptophan
34
All A.A. contain cyclic groups except
- proline
- histidine
- aspartate
35
All A.A. are found in unusually high amounts in collagen compared with other proteins
- isoleucine
- leucine
- proline
36
Which A.A. has basic side chains
- leu and lys
- lys and arg
- arg and leu
37
20 common amino acids are optically active except
- valine
- glycine
- alanine
38
highest concentration of cysteine could be found in
- keratin
- collagen
- myosin
39
Which A.A. contains the smallest side chain
- Alanine
- Glycine
- Serine
40
The simplest amino acid is
- Alanine
- Glycine
- Tyrosine
41
amino acids are mostly synthesized from
- fatty acids
- alpha-ketiglutaric acid
- mineral salts
42
The first amino acid of any polypeptide chain in a prokaryote is
- alanine
- glycine
- methionine
43
th naturally occuring proteins consist of
- D-amino acids
- L-amino acids
44
Which A.A. is a helix terminator
- proline
- tyrosine
- tryptophan
45
Which of the followig A.A. has a buffering capacity
- tryptophan
- arginine
- histidine
46
Which is an alpha imino acid
- valine
- serine
- proline
47
Sulphur containing A.A.
- Cysteine and serine
- Cysteine and methionine
- methionine and threonine
48
Positively charged basic amino acids are
- glutamine and arginine
- lysine and glutamine
- lysine and arginine
49
Absorbance at 280nm exhibited by protein is due to
- nonpolar amino acids
- all amino acids
- aromatic amino acids
50
Which among the following is both glucogenic and ketogenic
- lysine
- isoleucine
- histidine
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