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TLS Online TPP Program

#Question id: 5131

Differentiated cells express the genes and proteins characteristic of their final identity in the adult, and that identity can be altered only under special circumstances. How does the concept of differentiation, as described here, differ from the concept of determination?

#Unit 5. Developmental Biology

  1. Determined cells have begun to differentiate, but are not fully differentiated.

  2. Determined cells are embryonic cells that will give rise to all the cell types of the adult organism, but have not yet begun to express the genes and proteins characteristic of their final fates.

  3. Determined cells will continue to follow their fate if grafted into a different place in a host embryo, even though they do not yet express the genes and proteins characteristic of their final fate.

  4. Determined cells are embryonic cells that will form certain cell types and structures if development is allowed to proceed normally, but will alter their development in response to their location if transplanted to a different place in a host embryo.

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TLS Online TPP Program

#Question id: 4525

#Unit 3. Fundamental Processes

CTF1 (CCAAT-binding transcription factor 1) belongs to a family of transcription activators that bind a sequence called the CCAAT site
TLS Online TPP Program

#Question id: 4526

#Unit 3. Fundamental Processes

The DNA sequences to which hormone receptor complexes bind are similar in length and arrangement, but differ in sequence, for the various steroid hormones. Each receptor has a
TLS Online TPP Program

#Question id: 4527

#Unit 3. Fundamental Processes

The Mediator complex
TLS Online TPP Program

#Question id: 4528

#Unit 3. Fundamental Processes

Promoters for Pol II typically have a TATA box and Inr sequence, as well as multiple binding sites for transcription activators. The latter sites, sometimes located hundreds or thousands of base pairs away from the TATA box, are called
TLS Online TPP Program

#Question id: 4529

#Unit 3. Fundamental Processes

The “architectural” protein IHF (integration host factor) binds to sites on DNA and bends it., which statement not exist.
TLS Online TPP Program

#Question id: 4530

#Unit 3. Fundamental Processes

A protein complex engaged in the pairing of homologous chromosomes during cell division has also been implicated in stabilizing certain enhancer–promoter loops.