Form Of Transport Through A Membrane example essay topic
320 words
AP Biology 9/14/01 Plasma Membrane The fluid mosaic of a plasma membrane is made up of a semi permeable double barrier of phospholipids called a bi layer. A phospholipid is a phosphorus element with two fatty acids acting as tails. Due to the hydrophilic property of phosphorous, and the hydrophobic property of the fatty acids, this causes the phospholipids to line up in two rows with the tails in together because there are aqueous solutions on either side. This causes a semi permeable barrier that is called the plasma membrane. Semi permeable means that some things are able to pass through while others are not. When molecules are transported though a membrane using either method, it is called diffusion.
Passive transport is called passive because it requires absolutely no energy transfer to move things through the membrane. It occurs when the membrane either separates and allows the molecules through, or a piece of the membrane breaks off and surrounds the molecule and brings it through. The reason that no energy is used, is that the concentration gradient is going the same way as the molecules entering. This is one form of diffusion. When water is diffused through a membrane, it is passive transport, also known as osmosis. Another example of passive transport is glucose entering red blood cells.
The other form of transport through a membrane is active, this is when proteins called permeates imbedded in the membrane are sticking out of either side of the membrane and surrounds the molecule and moves it through to the other side. This form of diffusion is called active transport, because energy is used to move the molecule. An example of passive transport within the cell would be RNA exiting. On the opposite end, active transport requires energy because the molecules entering are going against the concentration gradient.
Things every student should keep in mind
- Free example essays found anywhere online are available to anyone, which makes them used, re-used, paraphrased, and abused millions of times.
- Watch out, some are poorly written!
- We strongly discourage you to submit free essays or any of their parts for credit at your school -- they are easily detected by PLAGIARISM CHECKERS.
- Get a brand-new, 100% original paper that will be written especially for you following YOUR EXACT instructions.
100% money back, no questions asked if you paper is plagiarized (this won't happen anyway).
We use a simple but effective principle: one satisfied customer will come back for more, but one who was cheated and misled will tell 10 others too.
Our clients are treated with the highest level of respect that a legitimate student deserves. You, as a customer, will feel this attitude starting from your first contact with our essay service and all the way through.
A significant percentage of cheap essay writing services have also been the source of complaints from students for selling cut and pasted work off the net -- this is a world away from the personalized essay service that EssayPride offers. All our guarantees are always kept -- we are nothing without quality, affordable prices, and the high degree of customer satisfaction!
What our customers say
Piotr S.
Toronto, Canada
I am an ESL student and I am only learning how to write good papers in English. Thanks to EssayPride I am mastering this skill much faster. They help me because they always respond any questions and explain me things I do not understand. They also strictly follow the deadlines and I am never late with my assignments. Thank you very much, guys, your hard work is appreciated. I will surely be ordering more.
Lindsay M.
Winston Salem, NC
Oh my Gosh! My life has become sooo much easier after I've come across this website. I am a working student, so sometimes I am too overwhelmed with so many things and I really need a hand with my papers. I am glad I have found a company I can trust. I have confidence in these guys, because they proved to be good quite a few times.
Kirk N.
Austin, TX
I never leave reviews for products or services because I am quite particular and picky. Surprisingly enough, EssayPride has managed to satisfy all of my requirements, even though I asked for several alterations to the paper they've sent initially. My assignments are quite complicated and it is essential to possess a certain level of knowledge in order to write a decent paper. These guys have managed, so I give them four stars.
Emma Ch.
Birmingham, UK
Customer service is very responsive to your queries, they answer any question within an hour. Even if you have a problem with an order, you can contact them and they will fix it promptly. The quality of writing is very good, writer knows what he is talking about. I had a very positive experience using this website, I will be a returning customer.
Travis J.
Perth, Australia
I used this website more than once and every time my experience turned out to be extremely positive. I think their price-quality ratio is very good, because I couldn't find anyone writing better than these guys, who would work for this money. Thank you!
Myung O.
Seoul, South Korea
I am a Korean student studying in the US. I would like to thank essaypride staff, especially writer Jeff P., for helping me out so much. My grades are good with all your help and I keep calm about the results of my year.
Boyi Zh.
St. Louis, MO
As probably any student, I was quite hesitant about asking somebody else to do my assignments at first. However, after EssayPride has sent me my first paper and I've read it, I understood that I could actually learn a lot from them. The research they've done was impressive and I understood the topic even better than after going to class and reading my textbook. I am not using this website to "cheat", I am using it as a tutoring service, they help me to understand the material better.
