Amino acids & Proteins Quiz

You have 15 minutes to complete 20 questions:

Image

TRUE / FALSE

  1. All proteins have both a primary and secondary structure.
  2. Denaturing proteins disrupts their primary structures only.
  3. Urea is a chaotrope which disrupts the hydrophobic interactions causing the protein to loose its tertiary structure.
  4. A typical amino acid has an amino group, a hydrogen atom and a carbonyl group bonded to a central carbon.
  5. The biuret test is only done to determine the presence of proteins not amino acids in a solution.

MULTIPLE CHOICE QUESTIONS

1. How many different types of amino acids are present?

a. 3

b. 20

c. 100

d. 120

e. none of the above

2. Which of the following forces is the most unfavorable for protein folding?

a. Covalent bonding

b. Vander Waals interactions

c. Conformational entropy

d. Hydrophobic interactions

e. Electrostatic interactions

3. An essential amino acid is one that:

a. readily available in the body

b. the body can synthesize

c. is essentially easy to synthesize

d. the body cannot synthesize

e. none of the above

4. The sequence of letters ‘KNQG’ will represent:

a. alanine, cysteine, proline, glycine

b. lysine, asparagine, glutamine, glycine

c. asparagine, lysine, glycine, glutamine

d. histidine, glycine, asparagine, valine

e. asparagine, glutamine, histidine, glycine,

5. The sulphur containing chain of cysteine is:

a. hydrophobic, highly reactive and capable of reacting with another cysteine

b. hydrophillc, highly reactive and capable of reacting with another cysteine

c. amphiphilic, not reactive with another cysteine

d. amphiphilic, highly reactive and capable of reacting with another cysteine

e. none of the above

6. Which amino acid when exposed to Ninhydrin produces a brown colour?

a.  alanine

b. valine

c. asparagine

d. proline

e. glycine

7. Beta pleated sheets are examples of protein’s:

a. primary structure

b. secondary structure

c. tertiary structure

d. quaternary structure

e. α – helix configuration

8. Sickle cell disease is due to:

a. a mutation in the beta chain of hemoglobin

b. mutation in the secondary structure between Glu and Val residues

c. a mutation in the alpha chain of hemoglobin

d. infection with a parasite

e. none of the above

9. Which one of the following is an essential amino acid?

a. alanine

b. cysteine

c. asparagine

d. glycine

e. valine

10. If an egg white protein of albumin is denatured into a hard boiled egg then which of the following is least affected?

a. the primary structure of ovalbumin

b. the secondary structure of ovalbumin

c. the tertiary structure of ovalbumin

d. the quaternary structure of ovalbumin

e. none of the above

11. Disulphide bonds are formed between:

a. between two cysteine residues

b. between two cystine residues

c. between a alanine and asparagine residue

d. between two glycine residues

e. none of the above

12. Alpha helicies in the secondary structure of proteins are affected by:

a. the interactions between R groups spaced 3 or 4 residues apart

b. the electrostatic repulsion or attraction between successive amino acid residues with charged R groups

c. the bulkiness of adjacent R groups

d. the occurrence of Pro and Gly

e. all of the above

13. The four subunits of hemoglobin represents:

a. primary structure

b. secondary structure

c. tertiary structure

d. quaternary structure

e. none of the above

14. The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

a. 7.0 and 9.0

b. 5.5 and 12.1

c. 2.2 and 9.4

d. 1.0 and 6.3

e. 0.5 and 11.0

15. Refer to the diagram below. Choose the correct answer:Image

a. parallel beta pleated sheet & anti parallel alpha pleated sheet

b. parallel beta pleated sheet & anti parallel beta pleated sheet

c. anti parallel beta pleated sheet & parallel alpha pleated sheet

d. anti parallel beta pleated sheet & parallel beta pleated sheet

e. none of the above

Image

Advertisements

2 comments on “Amino acids & Proteins Quiz

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s