Practice Questions

TLS Online TPP Program

#Question id: 2211

Which of these statements about facilitated diffusion across a membrane is true?

#Unit 2. Cellular Organization

A specific membrane protein lowers the activation energy for movement of the solute through the membrane.
It can increase the size of a transmembrane concentration gradient of the diffusing solute.
It is impeded by the solubility of the transported solute in the nonpolar interior of the lipid bilayer.
It is responsible for the transport of gases such as O2, N2, and CH4 across biological membranes.

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TLS Online TPP Program

#Question id: 3719

#Unit 3. Fundamental Processes

The processivity of E. coli DNA polymerase III holoenzyme accounts for all of the following except

TLS Online TPP Program

#Question id: 4928

#Unit 8. Inheritance Biology

A certain kind of snail can have a right-handed direction of shell coiling (D) or left handed coiling (d). If direction of coiling is due to a protein deposited by the mother in the egg cytoplasm, then a Dd egg-producing snail and a dd sperm-producing snail will have offspring of which genotype(s) and phenotype(s)?

TLS Online TPP Program

#Question id: 202

#Unit 1. Molecules and their Interaction Relevant to Biology

Unlike NADH and NADPH, Which of the following is correct for FAD and FADH

A) donate one electron at a time.

B) donate one or two electrons at a time.

C) do not become positively charged.

TLS Online TPP Program

#Question id: 12959

#Unit 10. Ecological Principles

Ozone layer depletion, since the 1970s, is primarily

TLS Online TPP Program