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25 Cards in this Set
- Front
- Back
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Type of membrane transport protein that can shift small molecules from one side of the membrane to the other by changing their SHAPE.
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Carrier Proteins
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What are two example of molecules carrier proteins transport?
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small organic molecules or inorganic ions.
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How do channel proteins get solutes across the membrane?
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they form tiny hydrophilic pores in the membrane in which solutes can pass by diffusion.
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What type of molecules do channel proteins let through?
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inorganic ions. This is why the pores are called ion channels.
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Of the two, channel and carrier proteins, which can transfer at a greater rate?
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Channel proteins
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T/F Total amount of positive charge is almost exactly balanced by negative charges both inside and outside of cell.
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True
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What is the most plentiful positive ion outside of a mammalian cell?
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Na+
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What is the most plentiful cation on the inside of the mammalian cell?
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K+
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How many different types of molecules can a carrier protein transport?
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Usually just one; they are very selective and different membranes are going to contain different sets of carrier proteins in them.
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Are carrier proteins capable of performing both active and passive transport?
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Yes
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How do channel proteins discriminate b/w solutes?
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size and electrical charge
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How do carrier proteins discriminate against solutes?
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binds specifically w/ solute and transfers by changing its shape.
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What is passive transport?
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when solute moves from area of high concentration to an area of low concentration.
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What is the source of energy that drives passive transport?
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the gradient of the solvent
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Does simple diffusion require transport proteins?
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no
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What is it called when a molecules moves from an area of low concentration to an area of high concentration?
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Active Transport
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In active transport, what is responsible for coupling the movement of the solute with some energy source?
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Carrier protein
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T/F All known Carrier proteins are multipass trans-membrane proteins.
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True
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What is the basic difference of a carrier protein from a channel protein?
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The way they discriminate between solutes.
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What type of cells utilize light driven proton pumps?
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Mainly bacteria cells
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From an area of high concentration to an area of low concentration.
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Passive Transport
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What is the source of energy that drive passive transport?
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The gradient of the solute
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From an Area of lower concentration to an area of high concentration?
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Active Transport
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In plants, fungi and some bacteria they use what type pumps that are similar to sodium and calcium pumps in animals?
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ATP Driven H+ pumps
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What type of proteins produce trans-membrane aqueous pores that allow passive movement of small H2O soluble molecules?
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Channel Proteins
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