Why does an enzyme not work as well if its active site is changed?

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

What processes take place before the mature mrna exits the nucleus?