CSIR UGC NET JRF Life Sciences - Biochemistry Practice Test on Amino acids and Proteins

This practice test is designed to assess your  knowledge in ‘Amino acids and Proteins ’. Choose the best answer from the four options given. When you've finished answering as many of the questions as you can, scroll down to the bottom of the page and check your answers by clicking 'Score'. Percentage score will be displayed along with right answers.

Biology Practice Test on Amino acids and Proteins

1. A peptide bond :
has a partial double bond character
is ionized at physiological pH
is stable to heating in strong acids
occurs most commonly in the cis congiguration
2. At neutral pH, a mixture of amino acids in solution would be predominantly
hydrophobic
negative and monovalent
hydrophobic
dipolar ions
3. Which one of the following states of hemoglobin(Hb) binds oxygen with the greatest affinity
Hb
Hb(O)2
Hb(O2)2
Hb(O2)4
4. Which of the following amino acids is most compatible with an α helical structure?
Proline
Tryptophan
Alanine
Cysteine
5. Which of the following techniques is used to separate proteins based upon to separate differences in their mass?
Isoelectric focussing
western blotting
Ion exchange chromatography
SDS gel electrophoresis
6. The greatest buffering capacity at physiologic pH would be provided by a protein rich in which of the following amino acids?
Lysine
Aspartic acid
Valine
Histidine
7. The site of enzyme modification by phosphorylation is the amino acid
Arginine
Cysteine
phenylalanine
serine
8. Which of the following reagents would be most useful in determining the N-terminal amino acid of polypeptide?
Trypsin
Cyanogen bromide
1mol/L HCl
Phenylisothiocyanate
9. Which one of the following statements is correct
The helix can be composed of more than one polypeptide chain
β sheets exist only in the antiparallel form
Motifs are a type of secondary structure
β Bends often contain proline
10. The highest concentration of cystine can be found in
melanin
keratin
myosin
collagen
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