0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How does water molecules move through the water cycle?
it moves very slowly
What creates selective permebility of plasma membrane?
It is because of the make up of the membrane. Most of the bilayer is hydrophobic; therefore water or water-soluble molecules do not pass through easily. Other do pass through easily. A cell controls what moves through the membrane by means of membrane proteins embedded in the phospholipid bilayer.
What is a section of the lithosphere that slowly moves over the asthenosphere?
Plate
Explain the function of the cell membrane?
The plasma membrane separates the cell from its' surrounding environment and is arranged in a bilayer sheet of phospholipids. It is a mosaic of molecules in a fluid. That is, the molecules are able to float around slowly (like islands in the sea). The cholesterol molecules are scattered among the phospholipids to allow the membrane to function properly at body temperature. Most of the bilayer is hydrophobic; therefore water or water-soluble molecules do not pass through easily. A cell controls what moves through the membrane by means of membrane proteins embedded in the phospholipid bilayer. Some membrane proteins have carbohydrates attached to them, forming glycoproteins that act as identification markers.
Does sound move through a solid slowly?
Sound moves through a solid faster than anything. In order it goes, solid, liquid, and gas. So metal is faster than water is faster than air.
Which molecules are often embedded within the lipid bilayer to help substances moves through the membrane?
proteins.proteins
Water freely moves through a phospholipid bilayer Why is this unexpected?
It moves through the bilayer via channels. These channels often are for transfer through the bilayer for other chemicals (sodium, potassium, etc) but also allow water to flow through readily. It is unexpected because water is hydrophilic (obviously- all charged molecules are). The phosphate part of the bilayer can bind with water, but the lipid on the inside of the bilayer acts like a layer of oil on the surface of the water- water cannot pass through the hydrophobic lipid.
What moves through the lipid bilayer of a plasma membrane most rapidly K glucose an amino acid CO2 or starch?
co2
How do substances like carbon dioxide and water moves in and out of the cell?
Carbon dioxide is a small nonpolar molecule which means that it can easily diffuse through the lipid bilayer of the cell membrane. Carbon dioxide moves from an area of high concentration to an area of low concentration. Diffusion is passive transport (no ATP required). Water is a polar molecule but it is pretty small so it can still dissolve through the lipid bilayer into the cell. The movement of water from an area of lower solute concentration to an area of higher solute concentration across a semipermeable membrane is called osmosis. Aquaporins are small water channels embedded in the lipid bilayer. These protein water channels provide a hydrophilic (polar) tunnel through the lipid bilayer for the fast movement of water across the membrane.. Aquaporins are a form of facilitated diffusion (diffusion with "help"). Osmosis and facilitated diffusion are forms of passive transport.
Osmosis can only occur if water travels through the what?
Osmosis can only occur if water travels through the semi-permeable membrane. This will cause water to cross the lipid bilayer.
Moves small or lipid-soluble solutes through the membrane?
simple diffusion
The planet that moves through the background of stars most slowly is?
Mercury... ^_^
What planet that moves through the background of stars most slowly?
mars
How does water molecules move through the water cycle?
it moves very slowly
Which creatures moves slowly?
A slug moves slowly and so does a snail
How does a seahorse moves slow or fast?
Slowly. Their tinly little fins will flap like crazy, but the seahorse will move slowly through the water.
How do substance like co2 and water move in and out of the cell?
Carbon dioxide is a small nonpolar molecule which means that it can easily diffuse through the lipid bilayer of the cell membrane. Carbon dioxide moves from an area of high concentration to an area of low concentration. Diffusion is passive transport (no ATP required). Water is a polar molecule but it is pretty small so it can still dissolve through the lipid bilayer into the cell. The movement of water from an area of lower solute concentration to an area of higher solute concentration across a semipermeable membrane is called osmosis. Aquaporins are small water channels embedded in the lipid bilayer. These protein water channels provide a hydrophilic (polar) tunnel through the lipid bilayer for the fast movement of water across the membrane.. Aquaporins are a form of facilitated diffusion (diffusion with "help"). Osmosis and facilitated diffusion are forms of passive transport.
