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.
Active transport: passage. -both carrier molecules and an expenditure of energy are required to transport substances against their concentration gradient. Active transport: 'pumps'. -Are proteins involved in active transport because they use energy to move a substance against its concentration gradient. Active transport: Sodium potassium pump. -Moves three sodium ions (Na+) to the outside of the cell and two potassium ions (K+) to the inside of the cell.