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TLS Online TPP Program

#Question id: 3992

RecA protein provides the functional link between DNA damage and the SOS response by displacing the LexA protein from its operator sites on the SOS genes.  RecA does so by:

#Unit 3. Fundamental Processes

  1. associating with polymerase holoenzyme to help it remove LexA from operator.

  2. bending LexA operator DNA to force dissociation of LexA repressor.

  3. binding to LexA protein to weaken directly its affinity for operator sites.

  4. causing self-cleavage of LexA, thus inactivating its binding to operator.

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TLS Online TPP Program

#Question id: 11525

#Unit 6. System Physiology – Plant

Coleoptiles are very sensitive to light, especially
TLS Online TPP Program

#Question id: 33433

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following
TLS Online TPP Program

#Question id: 32295

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the structure shown
TLS Online TPP Program

#Question id: 275

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the approximate diameter of a chromatin fiber?
TLS Online TPP Program

#Question id: 3615

#Unit 8. Inheritance Biology

What are alleles?