Which type of membrane protein could lead to a transplanted organ being rejected in a patient? Question 1 options: cell recognition protein carrier protein receptor protein channel protein enzymatic protein The components of the cell membrane are not fixed into permanent position and therefore the membrane is often describe as _______ in nature. Question 2 options: fluid changing static solid If a cell has a higher concentration of salt than the surrounding environment, the surrounding environment would be described as _________ to the cell. Question 3 options: isotonic hydrophobic hypertonic hypotonic The movement of water through a cell membrane is termed______. Question 4 options: facilitated transport osmosis diffusion facilitated diffusion Plasma membranes are _______ , which means they allow certain substances to enter and exit the cell. Question 5 options: fluid mosaic selectively permeable permeable The driving force in diffusion is: Question 6 options: membrane surface area temperature particle size concentration gradient This type of membrane protein experiences a shape change to move a substance across the cell membrane. Question 7 options: enzymatic protein channel protein carrier protein receptor protein junction protein In what important way does receptor-mediated endocytosis differ from pinocytosis? Question 8 options: it brings substances into the cell, while pinocytosis removes substances it transports only small amounts of fluid it brings in only a specifically targeted substance it does not involve the pinching off of membrane The cell membrane is primarily composed of molecules called: Question 9 options: phospholipids cholesterol carbohydrates proteins This form of movement across the membrane requires the input of ATP. Question 10 options: diffusion facilitated transport osmosis active transport
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QUESTION 1 Mark the true statements concerning this image. The best labels left to right are hypotonic solution, isotonic solution, and hypertonic solutions. Image 2 shows cells that are quickly losing fluid and shrinking. The best labels left to right are hypertonic solution, isotonic solution, and hypotonic solutions. Beaker three indicates cells are swollen to the point of bursting. QUESTION 2 Which statements are true of 4? This is a peripheral membrane protein, found on only one side of the membrane. This is a cholesterol molecule embedded in the core of the membrane. This protein is not tagged with a carbohydrate, so it is not a glycoprotein. This protein is a channel for transport. QUESTION 3 ______ are the main fabric of the plasma membrane. Cholesterol Phospholipids Integral proteins Peripheral proteins QUESTION 4 Which of the following is true of osmosis? It is vital to the water balance of all cells. When water cannot pass through a membrane. It is not very important to the life of cells. None of these are true. QUESTION 5 Plasma membranes are selectively permeable, meaning that all substances pass through freely substances can enter, but not exit freely. only water can enter and leave the cell it permits only certain substances to transport across the membrane QUESTION 6 Movement down the concentration gradient means molecules moving from areas of low concentration to high. high concentration to low heat towards water None of these. QUESTION 7 Match these descriptions to the correct transport model. A. simple diffusion B. facilitated diffusion C. active transport D. bulk transport A. movement of molecules across the membrane from higher concentration to low B. movement of solute out of the cell down the gradient using a membrane protein C. movement of molecules that requires ATP D. movement of transport vesicles and their contents QUESTION 8 Choose the one statement true of passive transport. It requires ATP. It is for recycling damaged cells and bacteria. It is only for the movement of water. It moves small, uncharged molecules across the membrane from areas of high concentration to areas of low concentration. QUESTION 9 Choose the list that contains the three types of passive transport: active transport, simple diffusion, facilitated diffusion isotonic, passive diffusion, facilitated diffusion osmosis, simple diffusion, facilitated diffusion None of these lists are correct. QUESTION 10 Specialized cells can identify specific targets for ingestion and engulf proteins, debris, and other cells. What is the term for the cellular ingestion of large particles or cells? exocytosis phagocytosis transcytosis pinocytosis
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Which of the following statements are correct? Explain your answers. A. The plasma membrane is highly impermeable to all charged molecules. B. Channels have specific binding pockets for the solute molecules they allow to pass. C. Transporters allow solutes to cross a membrane at much faster rates than do channels. D. Certain $\mathrm{H}^{+}$ pumps are fueled by light energy. E. The plasma membrane of many animal cells contains open $\mathrm{K}^{+}$ channels, yet the $\mathrm{K}^{+}$ concentration in the cytosol is much higher than outside the cell. F. A symport would function as an antiport if its orientation in the membrane were reversed (i.e., if the portion of the molecule normally exposed to the cytosol faced the outside of the cell instead). G. The membrane potential of an axon temporarily becomes more negative when an action potential excites it.
Phospholipid biosynthesis at the interface between the endoplasmic reticulum (ER) and the cytosol presents a number of challenges that must be solved by the cell. Explain how each of the following is handled. a. The substrates for phospholipid biosynthesis are all water soluble, yet the end products are not. b. The immediate site of incorporation of all newly synthesized phospholipids is the cytosolic leaflet of the ER membrane, yet phospholipids must be incorporated into both leaflets. c. Many membrane systems in the cell, such as the plasma membrane, are unable to synthesize their own phospholipids, yet these membranes must also expand if the cell is to grow and divide.
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