18 Questions
What are the three major components of biological membranes?
Lipids, proteins, and sugars
In biological membranes, what type of molecules form two-layered sheets?
Lipids
What is the main function of membranes in cells?
To regulate the movement of substances in an out of cells
Which process takes place on membranes related to the release of energy?
Photosynthesis
What type of interactions mainly hold lipid and protein molecules together in membranes?
Non-covalent interactions
What is the purpose of membranes in cell-to-cell communication?
To control the flow of information between cells
What types of lipids are found in biological membranes?
Phospholipids, glycolipids, cholesterol
Where are sugars attached in the membrane?
One side of the membrane only
What are the major functions of lipids in the body?
Energy storage, electron carriers, enzyme cofactors
In what form do lipid molecules associate to form supra molecular structures?
Monolayers, micelles, bilayers, vesicles
What is the basic structure of liposomes?
Microscopic vesicles with membrane-like lipid bilayers surrounding aqueous compartments
What solvents are lipids soluble in?
Organic solvents like propanone, ethanol, chloroform
What strategy do some plants use to tolerate colder temperatures?
Increasing the level of unsaturated fatty acids in their membrane phospholipids.
How do brain cell membranes of ground squirrels adapt during hibernation?
The membranes become more fluid.
Which type of proteins may be linked to the membrane by a glycolipid or phospholipid anchor?
Proteins with a single-pass structure.
How do caribou adapt to cold winters to prevent excess heat loss?
By reducing circulation in the lower legs.
What is a common feature of proteins that are linked to or embedded in the cell membrane?
They may associate with other proteins on the inner or outer face of the membrane.
What characteristic allows membranes to stay fluid even at cold temperatures?
High levels of unsaturated fatty acids.
This quiz covers the organization of cell membranes, including their functions as barriers, selective permeability, and control of substance movement in and out of cells. Explore how membranes play a crucial role in maintaining cell structure and function.
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