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TLS Online TPP Program

#Question id: 1091

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

#Unit 4. Cell Communication and Cell Signaling

  1. Only target cells retain the appropriate genes regulated by testosterone.

  2. Intracellular receptors for testosterone are present only in target cells.

  3. Only target cells possess the cytosolic enzymes that transduce the signal from testosterone to adenylyl cyclase.

  4. Only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor.

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TLS Online TPP Program

#Question id: 4783

#Unit 8. Inheritance Biology

Non allelic gene interaction If cross between AaBb X AaBb  what are proportional of progeny with white respective phenotype
TLS Online TPP Program

#Question id: 3274

#Unit 11. Evolution and Behavior

The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
TLS Online TPP Program

#Question id: 4406

#Unit 3. Fundamental Processes

An electrophoretic mobility shift assay (EMSA) was conducted to check for the binding of TFIIB to a segment of a DNA promoter region. Which of the following approaches could be used to confirm that TFIIB is indeed binding?
TLS Online TPP Program

#Question id: 1468

#Unit 4. Cell Communication and Cell Signaling

Why are BRCA1 and BRCA2 considered to be tumor-suppressor genes?
TLS Online TPP Program

#Question id: 15245

#Unit 5. Developmental Biology

which of the following is property of Syncytial specification?