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Which of the following is NOT an active process by which substances cross the plasma membrane?
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Pinocytosis
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Filtration
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Active transport
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Phagocytosis
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All of these are active processes.
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- Organelles and Cystic Fibrosis A plasma membrane transport protein called CFTR moves chloride ions out of cells lining cavities and ducts of the lungs, liver, pancreas, intestines, and reproductive system. Water that follows the ions creates a thin film that allows mucus to slide easily through these structures. People with cystic fibrosis (CF) have too few copies of the CFTR protein in the plasma membranes of their cells. Not enough chloride ions leave the cells, and so not enough water leaves them either. The result is thick, dry mucus that clogs the airways to the lungs and other passages. Symptoms include difficulty breathing and chronic lung infections. In 2000, researchers tracked the cellular location of the CFTR protein as it was being produced in cells from people with CF (Figure 3.13). Figure 3.13 Cellular location of the CFTR protein. Graph compares the amounts of CFTR protein found in endoplasmic reticulum, vesicles traveling from ER to Golgi, and Golgi bodies in CF cells and normal cells. In which organelle is the amount of CFTR protein most similar in both types of cells?Organelles and Cystic Fibrosis A plasma membrane transport protein called CFTR moves chloride ions out of cells lining cavities and ducts of the lungs, liver, pancreas, intestines, and reproductive system. Water that follows the ions creates a thin film that allows mucus to slide easily through these structures. People with cystic fibrosis (CF) have too few copies of the CFTR protein in the plasma membranes of their cells. Not enough chloride ions leave the cells, and so not enough water leaves them either. The result is thick, dry mucus that clogs the airways to the lungs and other passages. Symptoms include difficulty breathing and chronic lung infections. In 2000, researchers tracked the cellular location of the CFTR protein as it was being produced in cells from people with CF (Figure 3.13). Figure 3.13 Cellular location of the CFTR protein. Graph compares the amounts of CFTR protein found in endoplasmic reticulum, vesicles travel in g from ER to Golgi, and Golgi bodies in CF cells and normal cells. Which organelle contains the least amount of CFTR protein in normal cells? In CF cells?Which of the following requires a specific interaction with the molecules or substance it is going to take into the cell? fluid-phase endocytosis transcytosis PRE pinocytosis phagocytosis receptor-mediated endocytosis
- Which process is not used to move substances out of a cell? Multiple Choice Exocytosis Phagocytosis Active transport Simple diffusion Facilitated diffusionWhich of the following active transport mechanisms moves solid particles towards the interior of the cell? Group of answer choices phagocytosis pinocytosis vesicular transport exocytosisWhich of the following is true regarding the permeability of the cytoplasmic membrane? Nothing can diffuse across the membrane All molecules can freely diffuse across it Only non-polar molecules can diffuse across the membrane It is generally impermeable to ions, polar molecules
- A very small, uncharged molecule passes easily through the cell membrane.Which of these statements is the most likely explanation? the cell is expending energy to do this a protein carrier must be at work the cell membrane is mostly composed of liquid lipid molecules phagocytosis has enclosed this molecule in a vacuoleThrough a cell extends pseudopodia to engulf large particles. phagocytosis receptor-mediated endocytosis pinocytosis exоcytosisWhich of the following is defined as the division of the cytoplasm? interphase mitosis anaphase cytokinesis metaphase telophase prophase
- This type of cell transport happens during secretion of hormones, neurotransmitters and digestive enzymes. Pinocytosis Phagocytosis Exocytosis O Endocytosis 0 0 0Which of the following is part of the extracellular matrix? Group of answer choices All of the other answers are correct Proteoglycans Bax, Bak AKTs mTORMovement of molecules taken in from one site in the plasma membrane to a different region of the plasma membrane for secretion is called autophagy exocytosis phagocytosis endocytosis transcytosis
