QUESTION 4 Integral membrane proteins will only be firmly embedded or anchored in the plasma membrane if they are attached to peripheral proteins. They can be firmly embedded or anchored in the plasma membrane on occasions. They are not firmly anchored or embedded in the plasma membrane. QUESTION 5 Plasma membrane proteins have all of the following functions except: - Serve as transporters - Serve as enzymes - Serve as oils and fats - Are involved in cell-cell recognition QUESTION 6 Cell-cell recognition is involved with: - Cell acceptance and rejection - Cell development - Cell growth - Cell division
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It says that integral membrane proteins will only be firmly embedded or anchored in the plasma membrane if they are attached to peripheral proteins, but then it says they can be firmly embedded or anchored in the plasma membrane on occasions. So, the correct Show more…
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The cell membrane is composed of a phospholipid bilayer containing proteins and carbohydrates. Choose ALL of the statements that accurately reflect the structure and its function. 1. Membrane proteins may be enzymes to catalyze metabolic reactions within the cell. 2. Membrane proteins may contain cholesterol to serve as identification tags for other cells. 3. Channel proteins allow a specific molecule to cross the cell membrane that is unable to cross the phospholipid bilayer unassisted. 4. Receptor proteins bind to ligands, initiated cell signaling pathways. 5. Molecules that are large or nonpolar must use membrane proteins for transport
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The following three items (5-7) relate to the integral proteins in the cellular membrane. For this, use a if it's true or use b if it's false. 5. Generally, the portion of the integral proteins that crosses the cell membrane is in the form of a pleated beta sheet. 6. Generally, the portion of the integral proteins that crosses the cell membrane is lipid soluble. 7. Generally, proteins cross the membrane one or more times. 8. Carbohydrates in the cell membrane are important because they: a. Form channels and allow the passage of substances. b. Together with proteins, confer cellular identity. c. Prevent the passage of water. d. Act as enzymes.
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List four components of a plasma membrane and explain their function. a. Phospholipids: form the bilayer, Carbohydrates: help in adhesion; Cholesterol: provide flexibility; Integral proteins: form transporters; Peripheral proteins: part of the cell's recognition sites. b. Phospholipids: form the bilayer, Carbohydrates: help in adhesion; Cholesterol: form transporters; Integral proteins: provide flexibility, Peripheral proteins: part of the cell's recognition sites. c. Phospholipids: form the bilayer, Carbohydrates: part of the cell's recognition sites; Cholesterol: provide flexibility to the membrane; Integral proteins: form transporters; Intermediate filaments: help in adhesion. d. Phospholipids: form the bilayer; Carbohydrates: function as adhesion; Cholesterol: provide flexibility to the membrane, Integral proteins: form transporters; Intermediate filaments: part of the cell's recognition sites.
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