Outside of the U.S., many cruise lines do not have automatic tipping policies, says McDaniel, as other countriesâ tipping customs are different than ours (and thus their staff is paid differently), so it may pay to look at cruises leaving from other countries and then look at their âsuggestedâ tipping options.
Best Answer: Active transport is the mediated process of moving particles across a biological membrane against a concentration gradient. If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient.
In this example, active transport keeps the concentration of a substance low inside a cell, but the cell must expend energy to do so. In this scenario, several substances are moving into or out of the cell. Name the type of transport and whether the process requires an input of energy from the cell. Drag the labels to their boxes on the membrane. By acting as a kind of channel, carrier, or pump, transport proteins provide a passageway for those large or hydrophilic molecules to cross the membrane.