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TLS Online TPP Program

#Question id: 1738

T-cell help for antibody production:

#Unit 4. Cell Communication and Cell Signaling

  1. Depends on T-cell recognition of native antigen bound to B-cell surface Ig

  2. Depends on T-cell recognition of antigen processed by the B-cell

  3. Involves class I MHC on the B-cell

  4. Can occur in X-irradiated mice

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TLS Online TPP Program

#Question id: 24220

#Unit 1. Molecules and their Interaction Relevant to Biology

Glucagon stimulates cAMP from ATP. Cyclic AMP then activates cAMP-dependent protein kinase, phosphorylates PFK-2/FBPase-2. Phosphorylation of this protein enhances its FBPase-2 activity and inhibits its PFK-2 activity resulting
TLS Online TPP Program

#Question id: 7168

#Unit 5. Developmental Biology

Which one of the following signaling pathways will best support the mediolateral intercalation in the formation of the primitive streak in chick?
TLS Online TPP Program

#Question id: 3992

#Unit 3. Fundamental Processes

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:
TLS Online TPP Program

#Question id: 32265

#Unit 2. Cellular Organization

Persistently active signaling from the ER, particularly via PERK, activates genes that initiate:
TLS Online TPP Program

#Question id: 2826

#Unit 2. Cellular Organization

An open reading frame (ORF) is defined as a DNA sequence that

a. begins with a start codon.               

b. ends with a stop codon.

c. contains 50 codons.   

d. contains approximately an equal frequency of A, T, G, and C.