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?

#SCPH28 | Zoology
  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: 609

#SCPH05 I Biotechnology

The ________ theory explains cooperative binding by suggesting all subunits of a given protein have the same conformation, either all R or all T.

TLS Online TPP Program

#Question id: 610

#SCPH05 I Biotechnology

Protein A has four identical subunits, each of which binds one molecule of ligand Y. The binding of one molecule of Y to one of the subunits induces a conformational change in neighboring subunits that enhances the binding of additional units of Y. This is an example of________.

TLS Online TPP Program

#Question id: 611

#SCPH05 I Biotechnology

Which statement is false about the sequential theory of enzyme catalysis?

TLS Online TPP Program

#Question id: 612

#SCPH05 I Biotechnology

 The quaternary structure of hemoglobin changes from the T state to the R state ________.

TLS Online TPP Program

#Question id: 613

#SCPH05 I Biotechnology

Ethanol (CH3CH2OH) is the alcohol found in beverages. It is oxidized in the body to acetaldehyde by the enzyme alcohol dehydrogenase. Methanol (CH3OH), also known as wood alcohol, is converted to formaldehyde by the same enzyme. Acetaldehyde is toxic, but formaldehyde is far more toxic to humans, which is why the ingestion of relatively small amounts of methanol can cause blindness or death. One treatment for mild methanol poisoning is the administration of ethanol. Why might a doctor choose this treatment?

TLS Online TPP Program

#Question id: 614

#SCPH05 I Biotechnology

What type of inhibition is indicated by the data graphed below?