How can a heart cell and brain cell with the same dna have specialized functions

Aboy with an extra x chromosome probably has which of the following syndromes?

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?