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On the outer surface of the plasma membrane there are marker molecules that identify the cell-type Often these molecules are?
Wiki User
∙ 9y ago
These molecules are typically membrane carbohydrates. These assist in the identification of the type of cell.
Wiki User
∙ 9y ago
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The rate at which materials enter and leave through the cell membrane depends on the cells surface area?
small molecules (H2O) pass through the membraine easily where as larger or more complex molecules do not run through as easily.
What slender extensions of the plasma membrane that increase its surface area?
Microvilli:In some cells the membrane is thrown into minute fingerlike projections or folds called microvilli which greatly increase the surface area of the cell available for absorption or passage of materials and for the binding of signaling molecules.
Using an example explain what is meant by a partially permeable membrane?
A membrane that allows some things to pass through it but not others. It can be to do with size of the molecule, electronic charge or other characteristics. Think of a sieve or colander as an example of the semi-permeable membrane and a mixture of sand and peas as the chemical mixture at one side of the membrane. The membrane will only allow the sand to pass through based on size. In cases such as this, larger molecules could pass through active transport channels and such that may be present on the membrane but these are energy-dependant whereas diffusion across a semi-permeable membrane is not.
Glucose and no other sugar is transported into cells by protein carrier molecules in the cell surface membrane. How do carrier molecules specifically recognize glucose?
the receptors on the protein carrier recognise glucose allowing it to enter the cell :)
Function of cytoplasmic membrane?
Outer cell surface that regulates entrance and exit of molecules.
What is the name of a surface membrane molecule that causes an immune reaction?
Antigens are surface membrane molecules that cause an immune reaction.
What membrane surface molecules bind to proteins and serve as molecules identification tags?
Carbohydrates
What proteins in the cell membrane identify your cells?
cell-surface markers
What molecules are on the outer surface of the plasma membrane?
The outside surface of the plasma membrane is made of a layer of molecules called phospholipids, which have hydrophobic and a hydrophilic parts. The hydrophilic parts are on the outside surface, attracted by the water and other hydrophilic molecules outside the cell. There are also proteins of various kinds attached to and embedded in this outer layer.
Where do receptor molecules end up after receptor-mediated endocytosis?
Its NOT 'on the inside surface of the cell membrane' Probably ' on the inside surface of the vesicle'
What are the functions of carbohydrates on the surface of the phospholipid bilayer of the cell membrane?
they are signaling devices that are used to identify what is near the cell
What are two characters of fluids?
Viscosity refers to a fluid's resistance to flow, which is influenced by the internal friction between its molecules. Surface tension is the result of cohesive forces between molecules at the surface of a fluid, causing it to behave as if it were covered by an invisible membrane.
The rate at which materials enter and leave through the cell membrane depends on the cells surface area?
small molecules (H2O) pass through the membraine easily where as larger or more complex molecules do not run through as easily.
Which molecules are processed by the rough endoplasmic reticulum-?
The rough ER appears rough due to the presence of ribosomes on the membrane surface.
The membrane surface molecules that must be carefully matched between a donor and the recipient to avoid organ transplantation rejection are called?
histocompatability antigens
What are the functions of the plasma membrane in Eukaryotes?
Plasma membrane gives structure to the cell, serve as boundary. It allows the selective passage of molecules across the cell (semi permeable). Starts the signalling event from the receptors it posses on the membrane surface when there is a stimuli bind to it.
What controls the movement in and out of the cell in plant cells?
cell membrane aka plasma membrane
