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cellular transport
nop, is passive transport
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∙ 2010-08-29 17:21:28
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What type of transport is used to move glucose across the cell membrane?
Glucose moves across the cell membrane through facilitated diffusion. This type of transport uses protein carriers to assist glucose molecules across the cell membrane from an area of high concentration to an area of low concentration.
How do molecules diffuse?
Movement of solutes across a lipid bilayer plasma membrane can occur in many ways:1. Osmosis: diffusion of water across membranes to balance solute concentrations.- No energy req- Water passes through membrane via aquaporins, pores in the membrane permeable only to water.2. Simple diffusion: diffusion of only small, hydrophobic (nonpolar) molecules across a membrane down their concentration gradient.- No energy req- Only moves small nonpolar molecules down their concentration gradient3. Facilitated diffusion (passive transport): uses transmembrane protein transporters (channels and carriers) to move polar molecules (ions) across a membrane- No energy required- Channel proteins: Allow for rapid diffusion of specific ions down their concentration gradient- Can be activated by:- Voltage- Ligand- Mechanical force- Carrier proteins: Allow for selective diffusion of specific ions down their concentration gradient.- Uniport carriers: only transport one specific ion down its concentration gradient- Symport carriers: move two different types of ions in the same direction.- Antiport carriers: moves two different ions in opposite directions-Can use the energy created moving one molecule down its concentration gradient to move an ion against its concentration gradient- Carrier proteins exhibit saturation, competition, and specificity.4. Active transport: transport of solutes across a membrane against their concentration gradient.- ATP req- Uses carrier proteins- Leads to creation of potential energy stored in electrochemical gradients
What is the role of proteins in cells?
There are many uses for proteins in a cell membrane but the most common ones are: 1. Facilitated diffusion- a protein acts almost like a channel to allow molecules that cannot fit across the phospholipid bilayer to diffuse into/out of the cell 2. Active transport- proteins are used to move particles across the membrane from low to high concentration, using energy. 3. As receptor molecules which take signals from things like hormones.
Does active transport result in an even distribution of molecules?
No. Active transport uses energy to transport specific molecules against a concentration gradient. Passive transport will result in an even distribution of molecules because they allow molecules to move down a concentration gradient.
What does sound do to its medium?
Nothing, it merely just uses it as a form of transport from one place to another.
Does passive transport use the transport of proteins?
Yes, it uses both channel and carrier proteins
What uses carrier proteins to transport molecules across a semi-permeable membrane?
active transport...
A form of passive transport that uses transport proteins-?
A form of passive transport that uses transport proteins is facilitated diffusion.
Does active transport involves facilitated diffusion?
Nope. Facilitated diffusion is a passive transport. It uses carrier proteins, but doesn't require any energy.
Does diffusion use carrier proteins?
Active Diffusion uses carrier proteins; Passive Diffusion does not.
What are the four types of proteins found in the cell membrane?
Actually, bilipid "heads" form the layers of the membrane, but there are carrier proteins that transport objects into and out of the cells. These carrier proteins use either active or passive transport to get objects across the membrane. Active transport uses energy, while passive transport doesn't need to use energy to get items across. Hope this helps!!!
What is a form of passive transport that uses transport proteins?
Facilitated Diffussion
A form of passive transport that uses transport proteins?
Facilitated diffusion
How do facilitated diffusion and active transport differ?
Active transport uses energy and goes against the concentration gradient Facilitated diffusion doesn't require energy and uses ion channels or carrier proteins to move things down the concentration gradient.
What are 3 uses for proteins?
Proteins are used for cell-to-cell recognition, transport, and to catalyze reactions.
What process uses proteins to move molecules against a concentration gradient?
Active transport
Which process uses proteins to move molecules against a concentration gradients?
active transport
