Practice Questions

TLS Online TPP Program

#Question id: 899

Which statement is true about disulfide bonds and protein folding?

#Unit 1. Molecules and their Interaction Relevant to Biology

Disulfide bonds have no influence on protein folding since they only form after the protein adopts its native conformation.
Proteins occasionally adopt nonnative conformations and form improper disulfide bonds that can be reversed by the enzyme protein disulfide isomerase.
The folding of the native conformation is influenced more strongly by the formation of disulfide bonds than by the primary structure of a protein.
If a protein forms an improper disulfide bond it is irreversibly inactivated and must be

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TLS Online TPP Program

#Question id: 4163

#Unit 3. Fundamental Processes

The net effect of all amino acid tRNA synthetases binding to a tRNA is to position the __ of tRNA in the active site.

TLS Online TPP Program

#Question id: 10912

#Unit 6. System Physiology – Plant

Velocities for transport in the phloem are measured by using a technique which detect water flow;

TLS Online TPP Program

#Question id: 11659

#Unit 10. Ecological Principles

Which of the following steps are involved in stabilization of successful community?

TLS Online TPP Program

#Question id: 11416

#Unit 10. Ecological Principles

Which of the following biomes spans the largest annual mean temperature range, but the narrowest mean precipitation range?

TLS Online TPP Program

#Question id: 19460

#Unit 13. Methods in Biology

In phase contrast unobstructed light passes through a region of________ that both transmits only a small percentage of the light and changes its phase slightly.