Research a specific molecule that must be transported across the cell membrane. Answer the following:
1. What is the molecule needed for?
2. Which method of transport is used (simple diffusion, osmosis, facilitated diffusion, active transport, endocytosis or exocytosis)?
3. Briefly describe exactly how the molecule is transported.
This site is a good place to start with ideas: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/D/Diffusion.html
Your molecule must be unique. Please include your name at the end of your post.
21 comments:
The molecule Maltoporin is used to transport sugars through the cell. The type of transport that maltoporin uses is facilitated diffusion. It forms pores which allow disaccharides such as maltose and other molecules to go into the cell.
Brenna Hart(:
Retinol, the animal form of vitamin A, is a fat-soluble vitamin important in vision and bone growth. Non-polar molecules, such as retinol or fatty acids are poorly soluble in water. They are transported through aqueous compartments of cells or through carriers as retinol binding protein. The metabolites are not changed because no energy is required for facilitated diffusion.
Sodium-glucose transport proteins are used to transport glucose.This example would be known as active transport beacause energy is required for this type of transport. The glucose molecule binds to the proteins and are transported into the cell where they are released.
Megan Corey
Robbie Bridgman 12/7/09
Lab Report
Title- Cell Membrane Lab
Purpose- To learn about the cell membrane while manipulating another lipid bi-layer…soap.
Materials- 1. Lemon fresh juice
2. Warm water
3. Karosyrup
4. Straws
5. String
6. Thread
Procedures-
Flexibility- Fill the bubble holder and bend it into different configurations.
Self Sealing- Dip a straw into the pan and pull it out. Then blow a bubble in the solution by holding the straw slightly above the surface. Carefully inflate the bubble. Then lift the straw out gently.
Proteins and pores- Proteins- Put different shaped objects in the soapy solution. Then fill the bubble holder. Then insert your proteins into the soap bi-layer and move them around the membrane.
Pores- Take rubber band and douse it in the soapy solution. Then fill the bubble holder and carefully place soapy rubber band onto the bi-layer. Then pop the bubble inside the rubber band. You should be left with no bubble on the inside of the rubber band, and a bubble around the outside.
Double membrane system- Fill the bubble holder. Then gently hold it over your head and twist the holder. A double bubble should form. Then gently try and blow on the big bubble. This will cause a smaller bubble to form in the big bubble.
3D structure- First make a tube out of a sheet of clear plastic. Then place the tube about and inch or so above the bubble mixture. Take a straw and place it in the bubble mixture under the plastic tube and start blowing bubbles. Then stop when the whole tube is filled with bubbles.
Analysis-
Answer #1- the soap is flexible and bends with the strings.
Answer #2- the bubble does not pop.
Answer #3- the pores are important because they let things in and out of it.
Answer #4- yes, the bubbles take the shape of the plastic tube which is round.
Conclusion-
It is very important for cell membranes to be flexible. This is because there flexibility lets things enter and leave the cell. And also give the cell protection. There are 3 different types of proteins. The integral protein, which functions as gates for ions and molecules to go through. These gates lead to the interior. The receptor proteins, which bind to molecules outside the cell. These proteins provide communication between different cells. The marker proteins basically provide a nametag for the cell. The mitochondria, chloroplasts, and the endoplasmic reticulum all have their own lipid bi-layer. The purpose of filling the plastic tube with bubbles shows that cell membranes are very flexible and it represents how many cells can fit in small places.
the amino acids can be actively transported. they can be transported out of the kidney tubules and into the blood. it's active transport. also, the reuptake of Glu from the synapse back into the presynaptic neuron by sodium, driven symport pumps.
sarah hartmannn
Glucose is transported across the cell membrane through the protein channel. this molecule is needed to provide sugar for the cell. the method used to transport this molecule is active transport. the glucose is transported through the protein channel. it does this by capturing the molecule and then moving it through the protein into the cell.
The molecule potassium gets transported through the membrane. The cell uses potassium to get energy. To pass through the membrane it uses endocytosis.
The plasma membrane of human red blood cells
contain transmembrane proteins that permit the diffusion of glucose from the blood into the cell
Facilitated diffusion
In facilitated diffusion, molecules pass through channel proteins. The protein only admits certain molecules through
The molecule Serum albumin is used to transport water lipids into the bloodstream. the type of transport that it uses is facilitated diffusion. It transport fatty acids, and other molecules into the cell. and gets taken into the bloodstream.
Alexa Bertolini
the molecule potassium goes through the cell membrane. it is used for energy in a cell. endocytosis is used to pass through the cell.
water
1. water is needed to hydrate cells.
2. the method of transport is osmosis which is the diffusion of water. it is also an active transport.
3. the molecule is transported through osmosis. osmosis is the diffusion of water. diffusion is the process in which there is movement of a substance from an area of high concentratiom of that substance to an area of lower concentration.
1. the sodium and potassium molecules help maintain a high concentration of food and help the nerve cells send signals
2. active transport because it is moving the molecules from low concentration to a high concentration
3. uses ATP to send the sodium out of the cell and potassium in the cell
Daniel Gross
Adenine is one of the two purine bases used in forming nucleotides DNA and RNA. In DNA, adenine pairs with thymine, whereas in RNA, it pairs with uracil. Adenine combines with the sugar ribose to form adenosine, which in turn can be linked with up to three phosphoric acid units, yielding adenine derivatives that perform important functions in cellular metabolism.
Molecule: Potassium
Potassium is transported through the cell membrane.
Potassium is used to gain energy for the cell.
It's transported by endocytosis.
1. Waste isn't needed inside of the cell.
2. Waste is transported throguh exocytosis.
3. When too much waste builds up in the cell, the cell needs to get rid of it. The vesicles containing the waste combines with the cell membrane. Then the cell membranes start to open and all of the waste goes out.
Dan-anh Tran
The water molecule is used to diffuse in and out through the cell. Osmosis is used to transport the molecule around the membrane. The molecule goes through the plasma membrane and then moves around freely.
The molecule Ca2+ ATPases uses the energy provided by one molecule of ATP to pump one Ca2+ ion out of the cell. It uses facilitated diffusion. In resting skeletal muscle, there is a much higher concentration of calcium ions (Ca2+) in the sarcoplasmic reticulum than in the cytosol. Activation of the muscle fiber allows some of this Ca2+ to pass by facilitated diffusion into the cytosol where it triggers contraction.
maltose is needed for helping in the cell division of certain organisms, mainly e. coli.
This is an example of facilitated diffusion.
The plasmatic pores open up slightly, just big enough so that with help from channel proteins, the maltos can go through.
Glucose molecule- it is a very important carbohydrate. The cell uses it as a source of energy and metabolic intermediate. It is one of the main products of photosynthesis and starts cellular respiration in both prokaryotes and eukaryotes. Active transport is the way it is transported through the cell. This transporation happens through the apical membrane of intestinal and kidney epithelial cells depends on the presence of secondary active Na+/glucose symporters, SGLT-1 and SGLT-2, which concentrate glucose inside the cells, using the energy provided by cotransport of Na+ ions down their electrochemical gradient.
erica vignola (:
The ATP is used to transport energy to the rest of the cell. it uses fecilitated diffusion to move throughout the cell.
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