28. Anfinsen\'s experiments on denatured ribonuclease showed that a. protein den

Question

28. Anfinsen's experiments on denatured ribonuclease showed that a. protein denaturation is irreversible. b. proteins can renature to regain their activity only with the assistance of specialized enzymes. c. proteins have unique amino acid sequences d. proteins can renature and regain their enzymatic activity. 29. Which of the following are involved in forming the tertiary structure of proteins? a. H bonds b. Hydrophobic interactions c. Ionic bonds d. All of the above 30. The interaction of the and subunits to form the hemoglobin molecule is an example of structure. a. primary b. secondary c. tertiary d. quaternary 31. Like other catalysts, enzymes a. increase the rate of reactions without being consumed in reactions. b. shift the chemical equilibrium from more reactants to more products. c. do not alter the chemical equilibrium between reactants and products. d. Both a and c

Explanation / Answer

28)

d) Proteins can renature and regain their enzymatic activity. During his experiment the ribonuclease was denatured and it lost its function. However it was then allowed to renature by removing the denaturants and the ribonuclease folded spontaneously and become function.

29) d) All of these

There are hydrophobic interaction which is made where the hydrophobic side chains of neural and non-polar amino acids are buried in interior of the protein molecule and it hides from the aqueous core. There are H-bonds present between different side chain groups. Ionic interactions are also made between charged sites present on the amino acid side.

Ans 30) d Quaternary – The alpha and beta subunits that form the haemoglobin molecule is the quarternary folding. It is the last level of folding.

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