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TLS Online TPP Program

#Question id: 1086

What is the most likely mechanism by which testosterone functions inside a cell?

#Unit 4. Cell Communication and Cell Signaling

  1. It acts as a signal receptor that activates tyrosine kinases.

  2. It binds with a receptor protein that enters the nucleus and activates expression of specific genes.

  3. It acts as a steroid signal receptor that activates ion channel proteins in the plasma membrane.

  4. It coordinates a phosphorylation cascade that reduces spermatogenesis.

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TLS Online TPP Program

#Question id: 7085

#Unit 5. Developmental Biology

Experiments by Pieter Nieuwkoop and Osamu Nakamura showed that the organizer receives its special properties from signals coming from the:
TLS Online TPP Program

#Question id: 11788

#Unit 7. System Physiology – Animal

During the first few years after menopause, follicle-stimulating hormone (FSH) levels are normally extremely high. A 56-year-old woman completed menopause 3 years ago. However, she is found to have low levels of FSH in her blood. Which of the following is the best explanation for this finding?
TLS Online TPP Program

#Question id: 5617

#Unit 5. Developmental Biology

In sea urchins and mammals, the rise in Ca2+ concentration responsible for the cortical granule reaction is due to
TLS Online TPP Program

#Question id: 12793

#Unit 10. Ecological Principles

Approximately how many Kg of carnivore production can be supported by a field plot containing 2000 Kg of plant material?
TLS Online TPP Program

#Question id: 16135

#Unit 13. Methods in Biology

You obtain 6 BACs (of known order, as shown below) and 7 STSs (of unknown order) that derive from a region of mouse chromosome 16 whose genomic sequence has not yet been finished.   
 
By PCR (using 20-bp primers at either end of each STS), you test each of the 6 BACs for the presence (+) or absence (-) of each of the 7 STSs. You obtain the following results:
 
Would you expect the DNA sequence of PCR product obtained at STS5 using mouse genomic DNA as template to more closely resemble that obtained using BAC B, BAC D, or BAC F? Briefly explain your answer.