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TLS Online TPP Program

#Question id: 4017

Which of the following sequences of events occurs when E. coli are released from catabolite repression by transfer to low-glucose medium?

#Unit 3. Fundamental Processes

  1. cAMP levels rise, cAMP binds to CAP, cAMP-CAP complex binds to a site on DNA and activates transcription.

  2. cAMP levels rise, cAMP binds to CAP, cAMP-CAP complex binds to a site on DNA and represses transcription.

  3. cAMP levels rise, cAMP binds to CAP, cAMP-CAP complex is removed from a site on DNA and activates transcription.

  4. cAMP levels fall, cAMP is removed from CAP, CAP binds to a site on DNA and activates transcription.

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TLS Online TPP Program

#Question id: 11494

#Unit 2. Cellular Organization

How do aquaporins allow the passage of H2O but not H3O+?
TLS Online TPP Program

#Question id: 10752

#Unit 10. Ecological Principles

Which of the following is an example of Batesian mimicry?

A) a butterfly that resembles a leaf

B) a nonvenomous larva of a moth that moves like a venomous snake

C) a fawn with fur coloring that camouflages it in the forest environment

D) a snapping turtle that uses its tongue to mimic a worm, thus attracting fish
TLS Online TPP Program

#Question id: 30096

#Unit 1. Molecules and their Interaction Relevant to Biology

Orotic acid would be an intermediate.
A. Catabolism of guanine
B. Catabolism of uracil
TLS Online TPP Program

#Question id: 1196

#Unit 4. Cell Communication and Cell Signaling

Cell signaling means all of the following except:
TLS Online TPP Program

#Question id: 11682

#Unit 7. System Physiology – Animal

A young woman is given daily injections of a substance beginning on the 16th day of her normal menstrual cycle and continuing for 3 weeks. As long as the injections continue, she does not menstruate. The injected substance could be which of the following?