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TLS Online TPP Program

#Question id: 7107

What would be the effect on the timing of somite formation, if a piece of the pre-somitic mesoderm of a chick embryo is rotated by 180° and reinserted in its original position?

#Unit 5. Developmental Biology
  1. there would be no effect because the embryo would regulate and development would proceed normally
  2. antero-posterior development would be blocked at that point, and more posterior structures would fail to form
  3. the rotated mesoderm will reverse the gradient of somite formation, so that somite formation posterior to the rotated mesoderm will begin in the posterior and move forward to meet the previously formed somites
  4. the timing of somite formation will be reversed in the rotated block only, proceeding from posterior to anterior, but the rest of the somites will form in a normal fashion, proceeding from anterior to posterior
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TLS Online TPP Program

#Question id: 4491

#Unit 3. Fundamental Processes

HIV transcribes its genes from a promoter controlled by P-TEFb, P-TEFb is brought to the stalled polymerase by an RNA-binding protein, not a DNA-bound one. The protein responsible is called
TLS Online TPP Program

#Question id: 5625

#Unit 5. Developmental Biology

The energy needed to move the flagellum and propel the sperm comes from rings of mitochondria located in the midpiece of the sperm. Mitochondria generates energy when the sperm cell have
TLS Online TPP Program

#Question id: 4001

#Unit 3. Fundamental Processes

Which is not true about the lac repressor?
TLS Online TPP Program

#Question id: 11358

#Unit 10. Ecological Principles

In Holling's functional responses of predators, what is the most fundamental difference between a Type I functional response versus Type II and Type III functional responses?
TLS Online TPP Program

#Question id: 32209

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the structure shown