Download Q amino acid

1. Proteins contain
a. Only L- amino acids
c. D & L-Amino acids
b. Only D-amino acids
d.Both (A) and (B)
2. The optically inactive amino acid is
a. Glycine
b. Serine
c. Threonine
3. Sulphur containing amino acid is
a. Methionine
b. Leucine
4. An aromatic amino acid is
a. Lysine
b. Tyrosine
d. Valine
c. Valine
c. Taurine
5. An example of polar amino acid is
a. Alanine
b. Leucine
d. Asparagine
d. Arginine
c. Arginine
d. Valine
6. Which one of the following incorrectly pairs an amino acid with a valid chemical characteristic
a. Threonine and Isoleucine has two chiral carbons
b. Tyrosine; at neutral pH absorb light strongly at 280nm
c. Methionine, is amino acid contain sulphur atom
d. Histidine: has guanidinium group
7. Cystine contain disulfide a (—CH2— S—S—CH2— ) bond is synthesized from:
a. Cysteine
b. Methionine
c. Arginine
d. Leucine
8. glutamic acid: has Ip around
a. 3
b. 6
c. 8
9. Isoleucine; is non-polar and found:
a. on the surface of protein
c. not included in proteins
d. None of these
b. in buried in the centre of proteins
d.all of these
10. An uncommon amino acid that is found in collagen
a. Lysine
b. Glycine
c. proline
d. 5-hydroxylproline
11. Amino acid that has sulfur a and the first amino acid in a polypeptide chain:
a. Methionine
b. glycine
c. Valine
d. Asparagine
12. The two aromatic amino acids that absorb light at 280 nm at neutral pH:
a. Phenylalanine and methionine
b. Tyrosine and tryptophan
c. Alanine and serine
d. Arginine and aspargine
13. The Ip of histidine is:
a. 6
b. 7.58
14. The basic amino acids are
a. Lysine
b. Aspartate
c. 3.91
d. none of these
c. alanine
15. An amino acid used for the synthesis of thyroid hormone (thyroxin) is
a. Proline
b. Tryptophan
c. Tyrosine
d. tryptophan
d. Histidine