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phospholipids and proteins.

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Q: What are the two principal types of molecules in plasma membranes?
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What are the two types of molecules that compose cellular membranes?

Lipids and Proteins


What major types of lipid are found in the plasma membranes?

Phospholipids, cholesterol, & glycolipids.


Once the membranes have dissolved the DNA is released into the solution but so are many other types of cellular molecules list some types of molecules besides DNA that you would expect to find in?

d


Do all types of cells have plasma membranes?

YES... All LIVING cells have plasma membranes. Not every cell contains cell wall, but plasma membrane is essential for the life of a cell. If the cell loses its membrane or the membrane is ruptured, the cell will lose its cellular form and all the contents of the cell would be wasted and it would not be called a cell after that.


In addition to proteins organic molecules is also found in cellular membranes?

Three different types of molecules appear in the membrane of a cell. These molecules are lipids, proteins, and carbohydrates.


What are the names of the two types of sphingosine-based lipids?

Sphingomyelin is a phospholipid found in cell surface membranes (plasma membranes). Glucosylcerebroside is a glycolipid found in the myelin sheath of nerve cells (neurones). Both contain sphingosine.


What types of molecules have difficulty crossing the plasma membrane?

Large, polar, uncharged molecules cannot pass through a membrane without the help of protein channels embedded into the plasma membrane. Ions also have difficulty passing; they need ATPs.


What are the types of molecules that are reabsorbed by tubular reabsorption process?

large items ( white, red blood cells, plasma proteins) are retained


What is chloroplast made of?

Chloroplasts are made up of three types of membranes; an outer membrane (allows liquids and gasses to enter the nucleus), an inner membrane (regulates the passage in and out of the membrane of small molecules) and a system of thylakoid membranes.


Are membranes often perforated by proteins that extend through both sides of the membrane?

Yes - usually to transport molecules of various types either into or out of the cell.


Special kinds of matter?

The principal states of matter are: solid, liquid, gas, plasma. But today science recognize many other types: see the link below.


What are the types of membranes lining cavities that communicate with the exterior of the body?

Mucous Membrane