What is the function of transport proteins in the phospholipid bilayer?
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1. The modern understanding of the cellular or plasma membrane is referred to as the phospholipid bilayer or lipid bilayer. 2. It is composed of a bilayer of phospholipids. 3. Glycoproteins are attached to some of the proteins and lipids on the outward facing surface of the membrane. 4. Cell recognition is a function of carbohydrates. 5. The fluid nature of the membrane is due to phospholipids. 6. Cell membranes define and maintain the borders of cells. 7. Membrane transport refers to the collection of mechanisms that regulate the passage of solutes. 8. Cholesterol is integrated into the membrane structure that interacts extensively with the hydrocarbon chains of membrane lipids.
Adi S.
Which of the following best explains how the phospholipid bilayer of a transport vesicle contributes to cellular functions? A The phospholipid bilayer allows the vesicle to fuse with the Golgi apparatus and the plasma membrane, allowing the exocytosis of proteins. B The phospholipid bilayer physically connects the nuclear envelope to the rough endoplasmic reticulum, thus increasing the rate of transcription and translation. C The phospholipid bilayer of a transport vesicle contains chemicals that digest the proteins made in the rough endoplasmic reticulum. D The phospholipid bilayer contains enzymes that catalyze the conversion of hydrogen peroxide to water and oxygen.
Sri K.
2. For the transport proteins listed below, fill in the chart and answer about the kinds of molecules that they move and whether they can do active/passive transport. Type of transport protein | Type of molecules transported | Can do active or passive transport or both Carriers/Transporters Channels 3. Assume for the molecules listed below, that they are all moving from the outside of the cell to the inside of the cell under certain conditions shown in the chart that our imaginary cell is undergoing. Molecule | Intracellular Concentration | Extracellular concentration | Will movement to the inside of the cell require energy? | Will movement require a transport or channel protein? Which one? Na+ | 6mM | 110mM Ca++ | 0.1mM | 1mM Lactose | 0.01mM | 0.07mM CO2 | 3mg/L | 1mg/L
Madhur L.
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