Which of the following does not take place in a signaltransd

Which of the following does not take place in a signaltransduction pathway? O An external signaling molecule binds to a specific receptor. O An activated membrane-bound receptor undergoes a conformational change. O Proteins in the pathway add or remove phosphate groups from other proteins. O Activated proteins move into the nucleus to activate transcription factors. O Proteins are activated when histones are deacetylated.

Solution

1) Protiens are activated when histones are deacetylated.

Histones are not involved in signal transduction.

2) The mutation could allow telomerase to be expressed when it should not.

Cancerous cells continously express telomerase as a result of which these cells have their telomeres in tact and thus they constantly divide.

3)Retinoblsstoma results when an idividual inherits mutant gene from both the parents both of which are necessary for cancer to develop.

4). DNA repair genes.