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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 gradient
3. 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 else can I help you with?
Which statement best describes the molecules made of carbon hydrogen?
Molecules made of carbon and hydrogen are various and diffuse. The best description is that they are hydrocarbons and they burn well.
What properties do liquid and gases have due to the movement of their molecules?
Liquids and gases are amorphous (shapeless), viscous (can flow), and diffuse (have internal space) due to the movement of their molecules.
How gas spreads?
The random motion of the gas molecules allows them to diffuse throughout the space available to them.
How did rice diffuse and where did it diffuse to?
my mom
Would you expect the particles in chlorine gas to diffuse faster or slower than the particles in argon gas?
The rate of diffusion of a gas depends on the weight of the gas molecules. The heavier the molecules, the slower they move - the lighter the molecules, the faster they move. Nitrogen molecules weigh about 28 units. Chlorine molecules weigh 71 units. So we would expect nitrogen to diffuse more quickly than chlorine.
What type of molecules diffuse?
All types of molecules
How do you use diffuse in sentence?
Oxygen molecules diffuse across the membrane.
What kinds of molecules freely diffuse across a semipermeable membrane?
Water molecules freely diffuse across a semipermeable membrane.
Do molecules diffuse during equilibrium?
No.
Do all liquids diffuse the same way?
no because different molecules have different sizes. Smaller molecules will diffuse faster than larger molecules.
What determines how molecules are distributed in diffusion?
The concentration gradient is what causes molecules to diffuse.
How do molecules diffuse across membranes?
the reach equilibrium
What things diffuse into?
The molecules of food and oxygen diffuse into cells. oh and btfw co2 and waste chemicals diffuse ut of cells. im in year 3
What is an organ in the human body where molecules diffuse into the body?
The Kidneys
What molecule is able to easily diffuse across the cell's membrane?
Carbon dioxide, oxygen and some nonpolar molecules diffuse easily.
Do larger molecules diffuse more readily than smaller molecules?
No, smaller molecules generally diffuse more readily than larger molecules because they can move through pores and gaps in substances more easily due to their smaller size. This is why smaller molecules like oxygen and carbon dioxide can diffuse through cell membranes more quickly than larger molecules like proteins.
Molecules diffuse from capillaries to body cells by moving through the?
veins
