Practice Questions

TLS Online TPP Program

#Question id: 3865

Which of the following statements about E. coli RNA polymerase is false?

#Unit 3. Fundamental Processes

Core enzyme selectively binds promoter regions, but cannot initiate synthesis without a sigma factor.
RNA polymerase holoenzyme has several subunits.
RNA produced by this enzyme will be completely complementary to the DNA template.
The enzyme adds nucleotides to the 3' end of the growing RNA chain.

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TLS Online TPP Program

#Question id: 28060

#Unit 1. Molecules and their Interaction Relevant to Biology

The peptide bond in proteins is

TLS Online TPP Program

#Question id: 28061

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following force/Bonds contributes to protein stability

a. van der Waals interactions

b. Ionic interaction

c. Hydrogen bond

d. Di-sulphide bond

TLS Online TPP Program

#Question id: 28062

#Unit 1. Molecules and their Interaction Relevant to Biology

Thermostable proteins are stable at high temperature due to

a. Vander Waals interaction

b. Ionic bond only

c. High protein’s hydrophobic core

d. high incidence of salt bridges

Which of the following is correct

TLS Online TPP Program

#Question id: 28063

#Unit 1. Molecules and their Interaction Relevant to Biology

Characteristics of Thermostable proteins are

a. loosely packed core as evidenced by a high surface-to-volume ratio.

b. High amounts of Arg

c. High amount of Ala in helices

d. Stable at high temperature due to High protein’s hydrophobic core and high incidence of salt bridges

TLS Online TPP Program

#Question id: 28064

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following Techniques can be used to for Measuring Stability of protein

a. DSC (calorimetry)

b. Urea gradient gels

Which of the following is correct

TLS Online TPP Program

#Question id: 28065

#Unit 1. Molecules and their Interaction Relevant to Biology

Guanidinium ion and urea are