10 questions in 10 minutes

 

 

 

Q1+2: Choose the correct words to complete the following sentences:

spider web with water droplets
A spider’s web made of silk, an extremely strong protein!

Polypeptides are chains of joined together by condensation reactions.
The bond between two adjacent amino acids is called a .

3. The general formula for an amino acid is NH2CHRCOOH.
Which groups are used in forming the peptide bond?

  • A. R group and amine group
  • B. R group and carboxyl group
  • C. Amine group and carboxyl group
  • D. Amine group and Hydrogen

4. Which of the following is true about dietary requirements for amino acids?

  • A. Essential amino acids can be synthesized by the body and do not need to be obtained from food.
  • B. Non-essential amino acids cannot be synthesized by the body and must be obtained from food
  • C. Vegan diets require attention to ensure non-essential amino acids are consumed.
  • D. Essential amino acids cannot be synthesized by the body and must be obtained from food.

5. All the proteins produced by a cell, tissue or an organism is called a...

  • A. genome
  • B. ribosome
  • C. nucleus
  • D. proteome
6. The protein, haemoglobin, consists of ...
  • A. one polypeptide
  • B. three polypeptides
  • C. three amino acids
  • D. four polypeptides

7. Which statement best explains the almost infinite variety of possible peptide chains?

  • A. Peptide chains often have repeating sequences of amino acids
  • B. The number of amino acids in a peptide chain is limited to a few hundred
  • C. Amino acids in a peptide chain are always in a specific order
  • D. Peptide chains can have any number of amino acids, and the amino acids can be in any order.
8. Insulin consists of 2 polypeptide chains, the A chain made up of 21 amino acids and the B chain made of 30 amino acids. The two chains are linked by 2 disulphide bridges between cysteine residues. How many peptide bonds are in two molecules of insulin?
  • A. 51
  • B. 49
  • C. 98
  • D. 102

9. Proteins denature when heated.

The albumen of the white of the fried egg has denatured on heating. This happens because ...

 fried egg
  • A. charges between R groups are changed
  • B. an increase in vibrations break intermolecular bonds
  • C. a decrease in vibrations causes intermolecular bonds to form
  • D. amino acids are lost from the protein structure

10. How do extremes of pH impact the structure of a protein?

  • A. It denatures the protein by changing the sequence of amino acids
  • B. It stabilizes the structure by increasing the strength of its hydrogen bonds
  • C. It denatures the protein by changing the 3D conformation
  • D. It causes the amino acids in protein to become more hydrophobic