Active Transport Quiz - ProProfs Quiz.
Active transport requires energy for its execution because the movement of substances is usually against the concentration gradient, due to which, it has to make an extra effort to pass through. This type of transport is usually needed in cases where the cell requires higher amount or concentration of a substance within the cell for its proper functioning, like ions, glucose and certain kinds.
In active transport particles move against a concentration gradient and therefore require energy which must be supplied by the cell. Carrier proteins that are found in the cell membrane of cells use energy to transport molecules or ions across the membrane, against the concentration gradient. When organisms utilise active transport the energy for the process comes from respiration. Due to this.
Active Transport Active transport is the mediated process of moving molecules and other substances across membranes. Active transport differs from passive transport in that it utilizes chemical energy in the form of adenosine triphosphate, or ATP, to move molecules against the concentration gradient — from an area of lower concentration to an area of higher concentration.
Active transport methods require the direct use of ATP to fuel the transport. Large particles, such as macromolecules, parts of cells, or whole cells, can be engulfed by other cells in a process called phagocytosis. In phagocytosis, a portion of the membrane invaginates and flows around the particle, eventually pinching off and leaving the particle entirely enclosed by an envelope of plasma.
Previous IB Exam Essay Questions: Unit 10 Use these model essay questions and responses to prepare for essay questions on your in-class tests, as well as the IB Examination, Paper 2. The questions below have appeared on IB HL Examinations over the past several years. The answers following the questions are the mark-scheme ideal responses used to evaluate student examination responses. 1. The.
Secondary Active Transport: In secondary active transport, the movement of the sodium ions down their gradient is coupled to the uphill transport of other substances by a shared carrier protein (a cotransporter). For instance, in the figure below, a carrier protein lets sodium ions move down their gradient, but simultaneously brings a glucose molecule up its gradient and into the cell.
Active transport. Active transport is the movement of substances across membranes against their concentration gradients. Moving things against their concentration gradients requires an expenditure of energy (i.e., it is an endergonic process) This energy can be in the form of ATP (e.g., sodium-potassium pump) This energy can also be in the form.