Lipid bilayer

The cell is made up of a mix of protein and lipid. The lipid helps to give membranes their flexibility and the protein which helps in the transfer of molecules across the membrane. Phospholipids are the main molecules of the cell membrane. It forms a bilayer in which their hydrophilic (attracted to water) head areas are arranged to face the cytosol (liquid part of the cell) and hydrophobic (repel water) tail areas face outside the cytosol. The lipid bilayer is semi-permeable allowing certain…

Drug absorption depends on its solubility, routes and blood flow to the area for absorption. Lipid soluble, non-ionized drugs are absorbed faster than a water soluble.The cell membranes are lipid bilayers; they allow most lipid soluble drugs easily pass into the cell. Most drugs are absorbed by passive absorption, but some drugs need carrier-mediated transport (active transport). Small molecules diffuse more…

According to the cell theory, the cell is the smallest form of life but there are many parts of a cell which allow the cell to do the job it is assigned correctly. An example of a cell would be the animal cell, which is a eukaryotic cell or a cell that contains a plasma membrane. Inside the membrane there are parts of the cell called the organelles. (Animal Cell Structure, 2005) Organelles inside the cell have specific jobs to perform for the cell, organelles include the ribosomes, vacuoles,…

It provides the basic structure for biological membranes. One side of the molecule is made up of hydrophilic molecules (water loving) and the other end is made up of hydrophobic molecules (water hating). Even though the bilayer is constantly moving, is still forms an effective and secure barrier around the cell. The plasma membrane is semi permeable and this allows for small molecules such as water and glucose to pass through. However larger molecules rely on the protein…

Draw and label a simple diagram of a phospholipid molecule (2) Why are the phospholipid molecules arranged in a bilayer? (2) So the hydrophilic phosphate groups are both orientated towards the water present on the outside and on the inside of the cell What is the role of the phospholipid bilayer? (1) To act as a barrier to the entry of water soluble molecules such as glucose which can only cross membranes through protein channels Why is the term…

protection, sensation, temperature and damage as to make sure skin maintain in good condition. Study have been carried out on microscopic structure of skin where layer of epidermis which stratum corneum play an important role in hydration and its lipid maintaining skin hydration by preventing evaporation of water from skin or in other word it hold moisture of skin. As mention before, epidermis which is the outermost layer of skin which characterized by thin, tought ,waterproof and also play role…

cellulose. The protists and prokaryotes can hydrolyze the cellulose, which the cow or termite can then use. Lipids A. Fats- A fat is made of a fatty acid and a glycerol. A fatty acid is a long carbon chain with a carboxyl group on the end. It is made up of C-H bonds. Glycerol is an alcohol. Fats are used for energy storage. Fats can store two times as much energy as polysaccharides. Animals use fat instead of starch because fats can store more energy with less space. The adipose cell humans use…

phospholipid bilayer; consisting of a polar phosphate head and two fatty acid tails. The head is made from an alcohol and glycerol group and has a non-polar fatty acid tail made up from two strings of hydrogen and carbon atoms. The head cannot pass through the tails giving the bilayer stability. Despite the stability of the bilayer, the phospholipid…

must produce energy by allowing the necessary nutrients into the organelles while eliminating wastes that could be harmful to them. The cell membrane is also known as the phospholipid bilayer because of the fact that there are two layers formed by phospholipid molecules. The phospholipid has a phosphate and a lipid portion. "The phospholipids lie with their hydrophilic heads at the membrane surface and their hydrophobic tails on the inside..." (Anatomy and Physiology Textbook 66) There are two…

Peroxisomes serve to produce hydrogen peroxide through oxidation, as well as break it down by converting it to water, or using the hydrogen peroxide to oxidize other organic compounds. They also produce energy by metabolizing fatty acids (Cooper, 2000). Peroxisomes execute various metabolic functions and create hydrogen peroxide as a byproduct from the process of oxidation. However, since the hydrogen peroxide created by the peroxisome is toxic, the organelle also produces an enzyme called…