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4 lut 2010 · Active transport is the movement of molecules and ions through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration. Active transport requires carrier proteins (each carrier protein being specific for a particular type of molecule or ion)
Cell Membrane. Also known as the plasma membrane, the cell membrane is a semi-permeable area in a cell that separates the interior components of the cell from the extracellular matrix. Ions and organic molecules can selectively pass through the membrane.
The surface area refers to the total area of the organism that is exposed to the external environment. The volume refers to the total internal volume of the organism (total amount of space inside the organism)
AP Biology glossary of key terms with definitions, must-know facts, and related terms you need to know for your exam.
6 mar 2024 · Definition. Cotransport, also known as secondary active transport, refers to the process by which two or more different types of molecules or ions are transported across a cell membrane simultaneously, often in the same direction, with the help of a carrier protein. This mechanism harnesses the energy released by the movement of one molecule or ...
31 paź 2023 · Secondary Active Transport (Co-transport) Unlike in primary active transport, in secondary active transport, ATP is not directly coupled to the molecule of interest. Instead, another molecule is moved up its concentration gradient, which generates an electrochemical gradient.
18 gru 2016 · Let’s consider a couple of examples. Alveoli are small sacs – located in the lungs – which are responsible for both absorbing oxygen and expelling carbon dioxide. Instead of one large cell at the end of each airway, these small sacs are lined with hundreds of tiny, rectangular cells.
