1.) A protonated side chain in an enzyme’s active site a.) Can mimic the reactiv
ID: 205418 • Letter: 1
Question
1.) A protonated side chain in an enzyme’s active site
a.) Can mimic the reactivity of a metal ion
b.) Can donate a proton during catalysis
c.) Acts as a nucleophile during catalysis
d.) All of the above
2.) Amino acid residues with nonpolar side chains are mostly located in the protein interior because:
a.) Nonpolar groups cannot interact with water molecules
b.) Nonpolar side chains are bulky and rigid
c.) Nonpolar groups attract each other
d.) Nonpolar groups are more stable in a polar environment
3.) An enzyme accelerates a chemical reaction by
a.) Harnessing thermal energy to promote electron arrangements
b.) Increasing the activation energy of the system
c.) Giving energy to the reacting molecules
d.) Making it easier for reactants to reach the transition state
4.) An enzyme that carries out metal ion catalysis
a.) Is a prosthetic group
b.) Has a chemical label
c.) Includes a cofactor
d.) Lacks an active site
5.) Changing the configuration of C3 of glucose generates a(n)
a.) Glycoside
b.) Epimer
c.) Enantiomer
d.) Anomer
Explanation / Answer
1.
A protonated chain is usually present in active site of an enzyme. It is involved in catalysis as well as donates proton.
Option d is the answer
2.
Amino acid residues with non polar side chains are hydrophobic in nature and hence resided in the inner portions of a protein. They cannot interact with water.
Option a is the answer
3.
Enzyme reduces the activation energy of substrates so that they reach transition state easily.
Option d is the answer.
4.
An enzyme which carries out metal ion catalysis has a metal ion which is a cofactor.
Option c
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