Where are phospholipids made smooth or rough?
Where are phospholipids made smooth or rough?
The smooth ER is involved in the synthesis of lipids, including cholesterol and phospholipids, which are used in the production of new cellular membrane. In certain cell types, smooth ER plays an important role in the synthesis of steroid hormones from cholesterol.
What is the structure of a phospholipid molecule?
The structure of a phospholipid molecule contains two hydrophobic tails of fatty acids and one hydrophilic head of phosphate moiety, jointed together by an alcohol or glycerol molecule [90]. Due to this structural arrangement, PLs form lipid bilayers and are a key component of all the cell membranes.
What are the 4 parts that form a phospholipid molecule?
Phospholipids consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol. The phosphate group is the negatively-charged polar head, which is hydrophilic. The fatty acid chains are the uncharged, nonpolar tails, which are hydrophobic.
What is the difference between the rough and smooth endoplasmic reticulum?
The most basic difference between RER and SER is the presence of ribosomes. When ribosomes attach to the surface of an ER, it gives a characteristic rough appearance; hence it is called Rough ER. On the other hand, a smooth ER does not have ribosomes on its surface. It possesses ribosomes attached to its membrane.
Are lipids synthesized in rough ER?
The endoplasmic reticulum (ER) is a series of interconnected membranous sacs and tubules that collectively modifies proteins and synthesizes lipids. However, these two functions are performed in separate areas of the ER: the rough ER and the smooth ER.
What is the structure of a phospholipid molecule quizlet?
What is the structure of phospholipids? glycerol or sphingosine backbone with two fatty acid chains and a polar head group which has a phosphate attached to the glycerol and an R group.
How are the phospholipid molecules arranged in the membrane?
The phospholipids of a cell membrane are arranged in a double layer called the lipid bilayer. The hydrophilic phosphate heads are always arranged so that they are near water. Watery fluids are found both inside a cell (intracellular fluid) and outside a cell (extracellular fluid).
What does the phospholipid bilayer look like?
Phospholipid Bilayer. The phospholipid bilayer consists of two layers of phospholipids, with a hydrophobic, or water-hating, interior and a hydrophilic, or water-loving, exterior. The hydrophilic (polar) head group and hydrophobic tails (fatty acid chains) are depicted in the single phospholipid molecule.
What elements are in phospholipids?
Phospholipid Structure A phospholipid is made up of two fatty acid tails and a phosphate group head. Fatty acids are long chains that are mostly made up of hydrogen and carbon, while phosphate groups consist of a phosphorus molecule with four oxygen molecules attached.
What makes the rough endoplasmic reticulum rough?
It is called ‘rough’ endoplasmic reticulum because it is studded on its outer surface (the surface in contact with the cytosol) with ribosomes.