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#Question id: 1091

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

#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: 23158

#13. Methods in Biology

You have purified protein X and injected into an animal so that over a period of weeks, the animal will mount an immune response and make antibodies to protein X. By which technique these generated antibodies can be extracted from blood serum.
TLS Online TPP Program

#Question id: 8695

#9. Diversity of Life Forms

Phylogenetic trees constructed from evidence from molecular systematics are based on similarities in ________.
TLS Online TPP Program

#Question id: 8920

#9. Diversity of Life Forms

Almost all of the major animal body plans seen today appeared in the fossil record over 500 million years ago at the beginning of the
TLS Online TPP Program

#Question id: 19690

#13. Methods in Biology

In electrocardiogram, PR interval represents-
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#Question id: 19382

#12. Applied Biology

A plant can be made glyphosate resistant by