THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The movement of ions through proteins in a cell membrane, releasing energy
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The movement of water through phospholipids in a cell membrane, releasing energy
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The movement of ions through proteins in a cell membrane, using energy
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The movement of water through phospholipids in a cell membrane, using energy
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Detailed explanation-1: -The answer is A) A substance goes from an area of low concentration to an area of high concentration, and this requires energy. Active transport involves movement of substances across a membrane by a specialized protein.
Detailed explanation-2: -Endocytosis is a pathway for internalizing solid particles ("cell eating” or phagocytosis), small molecules and ions ("cell drinking” or pinocytosis), and macromolecules. Endocytosis requires energy and is thus a form of active transport.
Detailed explanation-3: -Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
Detailed explanation-4: -“Active Transport is defined as a process that involves the movement of molecules from a region of lower concentration to a region of higher concentration against a gradient or an obstacle with the use of external energy.”