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.
The movement of substances within the cell or across the plasma membrane is called cell transport. Mechanisms of cell transport can be divided into 2 main categories: active transport and passive transport. Both active and passive transport require energy.he movement of substances within the cell or across the plasma membrane is called cell transport. Mechanisms of cell transport can be divided into 2 main categories: active transport and passive transport. Both active and passive transport require energy.