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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?

#XL - Q Biochemistry

  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: 15212

#XL - Q Biochemistry

Sieving effect that contributes to the separation of proteins according to their size, in techniques such as SDS–gel electrophoresis, the concentration of gel used
TLS Online TPP Program

#Question id: 27465

#XL - R Botany

The first land inhabitant plants are__
TLS Online TPP Program

#Question id: 425

#XL - R Botany

Which is usually the slowest way to regulate a reaction in a metabolic pathway?
TLS Online TPP Program

#Question id: 431

#XL - R Botany

Which is not generally a molecule used to conserve energy?
TLS Online TPP Program

#Question id: 4575

#XL - S Microbiology

Monkeys of South and Central America have prehensile tails, meaning that their tails can be used to grasp objects. The tails of African and Asian monkeys are not prehensile. Which discipline is most likely to provide an evolutionary explanation for how this difference in tails came about?