Practice Questions

TLS Online TPP Program

#Question id: 1534

Cadherin proteins help animal cells stick (adhere) to each other. Choose which statement about cadherin in cancer cells that are metastasizing (spreading) throughout a patient's body is most likely correct.

#Unit 4. Cell Communication and Cell Signaling

Cadherin proteins in metastasizing cancer cells are likely to have mutations that make them less "sticky."
Cadherin proteins in metastasizing cancer cells are likely to have mutations that make them more "sticky."
Mutations in cadherin proteins are unlikely to affect the metastasizing of cancer cells.
Mutations in cadherin proteins accumulate at a constant rate that can be measured by a molecular clock.

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TLS Online TPP Program

#Question id: 28059

#Unit 1. Molecules and their Interaction Relevant to Biology

Treatment of RNaseA with 8M urea, but without adding mercaptoethanol would

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