True or False. Membranes separate one compartment from another - ✔️✔️True
Does the cell membrane consist of a single or double layer and what is it made of? - ✔️✔️- double layer
(bilayer)
- made of phospholipids with protein molecules inserted in them
What are the functions of a cell membrane? - ✔️✔️- physical isolation
- regulation of exchange with the environment
- communication between the cell and its environment
- Structural support
What is physical isolation, in relation to the functions of a cell membrane? - ✔️✔️- physical barrier
separating ICF and ECF
- separates cell from environment
What is regulation of exchange with the environment, in relation to the functions of a cell membrane? -
✔️✔️- controls entry, elimination and release
What is communication between the cell and its environment, in relation to function of a cell
membrane? - ✔️✔️- contain proteins that allow for responding or interacting with external environment
What is the structural support, in relation to the function of a cell membrane? - ✔️✔️- proteins in the
membrane are used to make cell-to-cell connections (tissue) and to anchor the cytoskeleton
what is the average composition of the cell membrane? - ✔️✔️- 55% proteins
- 45% lipids
- small amount of carbohydrates
, Are all cell membranes created equally? - ✔️✔️no
what does it mean when the cell membrane contains more protein? - ✔️✔️It is more metabolically active
what are the three lipids found in the cell membrane? - ✔️✔️- phospholipids
- sphingolipids
- cholesterol
which parts of phospholipids are hydrophilic and which are hydrophobic? - ✔️✔️- hydrophilic (likes water)
head which interacts with water molecules
- hydrophobic tail which hides
what lipid is considered the major lipid? - ✔️✔️phospholipid
what do sphingolipids usually create? - ✔️✔️- liquid rafts
- usually larger the phospholipids
What does cholesterol do as a lipid? - ✔️✔️- increases viscosity (not so loose)
- decreases permeability
what is the current cell membrane model called? - ✔️✔️fluid mosaic model
what does the extracellular surface contain? - ✔️✔️glycoproteins and glycolipids
how many different types of proteins are inserted into the membrane? - ✔️✔️10-50 different types that
can be loosely or tightly bound to the membrane
what proteins are include in integral proteins? - ✔️✔️- transmembrane proteins
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