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A cell membrane is basically a double layer of lipids (fat molecules) with a bunch of proteins in it. Each fat molecule has two molecular "tails" that don't mix with water (just like oil doesn't) and one extremity that does. Because of this characteristic the part that does mix with water is facing outward (cells are immersed in water environments) or inward (cells are mostly water on the inside) and the double "tails" are sandwiched on the inside, there they don't come into contact with water, only with eachother and other molecules that don't mix well with water.
There are basically two types of protein that are found in the membrane:
- some that cross all the way through, called 'transmembrane'. These are able to do this because they, like the double layer of positionally opposite fat molecules, have one part that doesn't mix with water and two parts that do. Membrane pores for instance would be of this type.
- Some that are on the periphery of the double layer, either on the outer part or inner part, called 'peripheral proteins'. These mix with water and consequently they also mix well enough with molecules that mix with water.
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Does human cells have a cell membrane?
Animal (including human) cells have cell membranes, and so do plant cells. Animal cells do not have a cell wall, however.
What is the outside of a plant cells called?
The cell wall :) was in my state standards book for 7th grade, so it must be right
Thin outer layer of cells in a plant?
the answer is epidermis
What structure controls the passage of substances into and out of the cell?
cell membrane
Where is the cell control center and the cell membrane?
where is the cell control membrane and the cell membrane
Do cell membrane have cells?
All the cells have the cell membrane. If you are in lower grade than 7th grade you didn't learn that.
Does the cell membrane keep materials from entering or leaving the cell?
yes, the cell membrane does keep material from entering or leaving the cell -karla cruz 7th grade
Does human cells have a cell membrane?
Animal (including human) cells have cell membranes, and so do plant cells. Animal cells do not have a cell wall, however.
What is the outside of a plant cells called?
The cell wall :) was in my state standards book for 7th grade, so it must be right
Is a cell wall a cell membrane?
No it is not. A cell wall is a rigid outer structure on a plant or algae cell. A cell membrane is a flexible outer layer on every cell, but doesn't provide much protection. answered by Shelby 7th grade
What boundary represents the cellular level between cells?
cell membrane
What regulates passage of materials into and out of cells?
The cell membrane controls movement of materials in and out of the cell.
Which cell structure controls what enters and leaves the cell?
The selective permeability of the cell membrane
What cell structures are made primarily from phospholipids?
cell membrane
Thin outer layer of cells in a plant?
the answer is epidermis
What is the thin flexible barrie around a cell?
Yes it is the CELL MEMBRANE It allows the cell to bend its form and shape but return to normal right away. from a little scientist 6th grade stuff rocks :P
What structure controls the passage of substances into and out of the cell?
cell membrane
