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A plasma membrane is composed mainly of an unordered phospholipid bilayer (double layer) embedded with membrane proteins which forms a thin flexible sheet. This gives the membrane several general properties including: semi permeability to different molecules, stability and the ability to form compartments which create different environments for ...
Describe how phospholipids are arranged in a plasma membrane? Phospholipids are arranged in a bilayer (a double layer). They have hydrophobic tailss (made of fatty acids) and hydrophilic heads (made of a phosphate group). The hydrophilic heads are to the outside and the tails to the inside. Phospholipids are arranged in a bilayer (a double layer).
A formation that allows this is the lipid bilayer, in which the phospholipids form two rows, with the hydrophobic tails hiding on the inside and the hydrophilic heads on the outside. This creates a water-proof, insoluble barrier, making membranes effective at separating the inside and outside of a cell. This is also the structure of membranes ...
The light dependent and light independent reactions are two stages of photosynthesis that overall utilise light energy to fix carbon dioxide into sugar molecules. There are however major differences between the two stages. Light requirement: As the name suggests, light dependent stage requires the absorption of light, and is the first stage of ...
The red blood cell is surrounded by a plasma membrane which is relatively weak and bursts with the increased pressure due to the water, whereas the plant cell also contains a cell wall. The cell wall provides more support and so the plant cell wouldn't burst but become turgid, as turgidity increases water influx decreases.
On a periodic table, we can see that the atomic number for lithium is 3. The atomic number represents the number of protons in an atom, so Lithium has 3 protons. The atomic mass is the number of protons and neutrons of an element. As seen on a periodic table, Lithium has an atomic mass of 7. We know the proton number is 3, so 7-3 = 4, is our ...
Bacteria are used in industry to produce enzymes and other proteins. Because they are prokaryotes and don't have a nucleus, every DNA plasmid that is taken up is translated. You just have to insert the plasmid that codes the protein you want to produce and the bacteria will make it. They also have a very rapid expansion phase and are easy to ...
The platelets stick together, forming a temporary plug. Thromboplastin, released from damaged tissue and platelets, as well as Ca2+ and vitamin K from the plasma, are released which changes the soluble prothrombin into thrombin. As this is an enzyme, it catalyses soluble fibrinogen to change into the insoluble fibrin.
Phospholipids are a type of molecule with a phosphate head, and fatty tails, which form a double layer around the cell. The proteins sit within the membrane at intervals, which is why the cell membrane is a "mosaic". It is described as "fluid" because the proteins can move around within the membrane, by moving between the phospholipids. The ...
Red blood cells transport oxygen from the lungs to all the cells in the body. To do so effectively, they have lots of adaptations: Red blood cells contain haemoglobin, which is a molecule that r eversibly binds to oxygen. Red blood cells have no nucleus, so that there is more room for haemoglobin in the cell. Red blood cells have a biconcave ...