17. The fluid aspect of the fluid-mosalc model of the plasma membrane applies to
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17. The fluid aspect of the fluid-mosalc model of the plasma membrane applies to the: A. Transport of soluble materials across the membrane B. Water in the membrane C. Lateral movement of lipids and proteins within the bilayer D. Movement of lipid-soluble materials through the bilayer E. Shape of the membrane 18. From its atomic number of 15, one can state that the phosphorus atom has A. B. C. D. E. 15 protons and therefore 15 electrons 15 protons and therefore 15 neutrons 15 neutrons 15 protons Any combination of protons and electrons that totals 15 Which of the following represents the correct order of the layers of the epidermis from the deepest to the most superficial? A. Stratum lucidum, stratum granulosum, stratum corneum,stratum basale, and 19. stratum spinosum Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum B. C. Stratum spinosum, stratum basale, stratum lucidum, stratum cormeum, and stratum granulosum D. Stratum basale,stratum granulosum,stratum lucdum,stratum spinosum, and stratum corneum E. Stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale across the cell membrane 20. A symporter will transport A. Two different ions or molecules in opposite directions B. Two different ions or molecules in the same directions C. Two of the same ions or molecules in the same direction D. One specific ion or molecule E. Two of the same ions or molecules in opposite directionsExplanation / Answer
17. C) According to fluid mosaic model of the plasma membrane, the phospholipid molecules form a bilayer with their hydrophilic heads facing the exterior and interior of the membrane and the hydrophobic head facing the middle part of the membrane. Embedded in the membrane either partially or fully are the protein molecules. The proteins and the lipids are loosely attached to the membrane. Moreover, the phospholipid molecules are not attached to each other by bonds. That is why lateral movement of proteins and lipids occur within the membrane which accounts for fluidity of the membrane.
18 A) Atomic number is the number of protons in the nucleus. In an uncharged atom, atomic number is also equal to the number of electrons. Phosphorus atom has 15 protons in the nucleus and to balance the charge, there are 15 electrons in the orbit.
19. B) from outside (superficial) to inside ( deepest ), the layers are -
Stratum Corneum
Stratum Lucidum
Stratum Granulosum
Stratum Spinosum
Stratum Basale
Reverse it. and you will get your answer.
20. B) A symporter is a protein molecule which transports two different ions or molecules in the same direction. In the small intestine and kidney tubules Sodium and Glucose are transported together by a protein known as two Na+ / one-glucose symporter.
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