In the past, an irregular heart rhythm was treated by using a drug to regulate the beat. there is a treatment that can also regulate heart rhythms that has replaced drugs in some cases. what is that treatment?

Match each symbol with its description.

When a cell is in a solution that has the same concentration of water and solutes as its cytoplasm, the cell is said to be in a(n) solution. a. isotonic b. hypotonic c. hypertonic b. facilitated

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 .