1. Proteins can be denatured by a) Changing temperature. b) Adding Urea to the s
ID: 140597 • Letter: 1
Question
1. Proteins can be denatured by
a) Changing temperature.
b) Adding Urea to the solution.
c) Changing solvent.
d) All of the above.
2 Which of the following statements about entropy is true?
a) Entropy is a measure of system multiplicity.
b) The standard unit of entropy is kcal/mol.
c) Entropy can be estimated from internal energy.
d) In general, the entropy of a protein increases during folding.
3) van der Waals force is a kind of electromagnetic force.
a) True
b) False
4. In an alpha helix, residue i is hydrogen bonded to
a) Residue i+3 through its side chain.
b) Residue i+3 through its backbone.
c) Residue i+4 through its side chain.
d) Residue i+4 through its backbone.
Explanation / Answer
Ans-1 (d)
Breakdown of quaternary, tertory, secondary structure of protein is known as denaturation which is caused by external stress or force such as heat,organic solvent,salt,strong acid and base.
Ans-2
a) enthalpy is measure of system multiplicity which is stabilized by Boltzmann equation, so true
b)The standard unit of entropy is kcal/mol.The SI unit is Joule/Mole but kcal is also a unit of energy so this holds equally true.
c) Entropy indicate randomness of system while internal energy is total kinetic and potential energy of system, so statement Falls
d) protein has greater entropy in the folded state so false
Ans-3
Vander-Waals forces are a kind of intermolecular forces which are weak and short range forces that exist between uncharged molecules. Therefore, the statement is False.
Ans-4
As in alpha-helix, the carboxyl group of one amino acid forms a hydrogen bond with amino group of another amino acid (4) residue down the chain and this is denoted as i + 4 – I hydrogen bonding . Thus the residue i is hydrogen bonded to residue i+4 through its backbone.
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