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Transmembrane proteins span the width of the cell membranes. Four types of transmembrane proteins are shown in a section of cell membrane.
Although these proteins have different specific functions, they all --
- a. help the cell interact with its external environment
- b. stop
chemical reactions within the cell - c. synthesize molecules that signal other cells
- d. remove large waste particles from the cytoplasm of the cell.
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- The figure below illustrates a portion of a cell membrane. X denotes a membrane-spanning protein channel. Illustration of a partial cell membrane Which of the following is most likely true about the structure of X X A The upper and lower ends of X are hydrophilic and its middle is hydrophobic. C D The upper and lower ends of X, as well as its middle, are all hydrophobic. The upper and lower ends of X are hydrophobic and its middle is hydrophilic. The upper and lower ends of X, as well as its middle, are all hydrophilic.At this point, go over your answers to the activit ies given earlier in this lesson before you fill out the table below. Table 20: Interdependence of Function and Fom in the Cell Membrane Which components of the cell membrane enable it to perform this function? Function of the Cell Membrane How do these components help the cell membrane in performing this function? iully control the passage of substances through its membrane. However, all activit ort, involve energy. This leads us to another characte As stated in the first section of this lesson, maintaining homeostasis requires ise this in poweringIf a tissue in the body has cells that contain a large quantity of gap junctions, this likely means that.. the cells are connected together so tight that there are no spaces between the cells the cells are not connected at all the cells are connected together so tight that it is difficult to rip them apart O the cells are connected together in a way that allows them to share cytoplasm
- Which of the following statements are correct about how the complex biological matrix of the cell may affect protein folding, stability and function (select all that appy)? A. ATP tends to "bounce" along the surfaces of many proteins without forming a stable complex B. Proteins make up approximately 30% of the total volume of the cytoplasm in a typical cell C. Compettition between drug molecules and metabolites in the cytoplasm may cause unexpected drug side effects not seen with individual proteins in solution. D. Large protein complexes move faster through the cytoplasm than small metabolites. E. Complex intercations between proteins in the cell may significantly destabilize a protein compared to the isolated protein in waterThe binding of sodium ions (Na+) to a membrane protein is one of the first steps in initiation of the sodium-potassium pump that moves these ions across the membrane. The picture shows the inital set up in this process. How does the protein get the energy needed to continue the process of moving the (Na+) across the cell membrane? Membrane Protein ONa+ Inside the Cell A. O O Nat oc Outside the Cell Con Mitochondria will attach to the protein and provide the energy to push the Na+ through the protein. Energy from ADP is released and a channel in the membrane protein permanently B. opens, resulting in the passage of the Nat. Energy produced from the difference in solute concentration on both sides of the O c. membrane pulls the Na+ through the protein. Con с ATP attaches to the protein and releases a phosphate, making energy available to OD. change the shape of the protein and allowing the passage of the Nat.CELL ENVIRONMENTS Fill in the following statement: Diffusion is the movement of molecules from_high_concentration to_low. concentration. is the diffusion of water. BEAKER #I The solution inside the beaker is: % water % salt The solution inside the cell is: 90 10 % water % salt 20% salt How will the water move? Into the cell or out of the cell? 10% salt How will the movement of water affect the cell? The cell O Water molecules This is a(n) solution.
- Transmembrane proteins DO NOT transport oxygen or carbon dioxide across the membrane O provide structure to cells promote adhesion between cells transmit information across the plasma membraneWhich of the following is not a location of ribosomes?a. on the nuclear membraneb. free in the cytoplasmc. strung along messenger RNAd. inside the rough ERProteins are inserted into the structure of a cell's plasma membrane. Which of the following would not be a function of these membrane proteins? forming channels acting as receptors forming the entire glycocalyx anchoring cells to other structures MacBook Pro
- In cell membrane, the regulation of membrane rigidity is the function of _____. While proteins ______ A. Carbohydrates; Cell recognition B. Cholesterol; Move nutrients and electrolytes across C. Lipid; Impart polarity to the interior membrane D. Fatty acids; Prevent tight packing of fatty acid chains E.Cholesterol; Act as receptors for neurotransmitter and hormone bindingWhat type of membrane protein is shown in the figure below? HIN NH Cysteine-rich domain Protein tyrosine kinase domain COO "Ooc O Receptor protein O Transport protein Structural protein O Channel proteinIn the image, the tight junction proteins link cells together creating a barrier. These barrier proteins... protein A apical plana embrane (A) tight ntion lateral plauma brane banal plama membrane bal lamina Oa Puli the cells so close together ions struggle to fit between cells. O b. ) Prevent Transmembrane proteins from using membrane dynamics to float from the apical to the basolateral locations of a cell. OC. Are cytoplasmic-side anchoring proteins O d. Prevent proteins and lipids trom moving from apical to basolateral and don't let things pass between 2 cells side by side.
