The Roles of Membranes Flashcards
(20 cards)
What is the primary function of biological membranes?
To serve as barriers that regulate the movement of substances in and out of cells.
True or False: Membranes are impermeable to all substances.
False
Fill in the blank: Membranes are primarily composed of ________ and proteins.
lipids
What role do proteins play in membranes?
Proteins facilitate transport, act as receptors, and provide structural support.
What is the fluid mosaic model?
A model that describes the structure of cell membranes as a mosaic of various components that move fluidly.
Multiple Choice: Which of the following is NOT a function of membranes? A) Transport B) Communication C) Energy production D) Protection
C) Energy production
What is selective permeability?
The ability of a membrane to allow certain molecules to pass while blocking others.
True or False: Membranes can be involved in cell signaling.
True
What is the role of cholesterol in membranes?
Cholesterol helps to stabilize membrane fluidity and structure.
Fill in the blank: The ________ layer of the membrane is hydrophobic.
lipid
What is the function of glycoproteins in membranes?
Glycoproteins are involved in cell recognition and signaling.
Multiple Choice: Which type of transport requires energy? A) Passive transport B) Active transport C) Facilitated diffusion D) Osmosis
B) Active transport
What is the significance of membrane potential?
Membrane potential is essential for the function of nerve and muscle cells.
True or False: Membranes can compartmentalize cellular functions.
True
What is endocytosis?
A process by which cells engulf material from the outside environment.
Fill in the blank: The ________ membrane separates the nucleus from the cytoplasm.
nuclear
What is exocytosis?
The process of vesicles fusing with the plasma membrane to release their contents outside the cell.
Multiple Choice: Which component helps in the formation of lipid bilayers? A) Nucleotides B) Amino acids C) Fatty acids D) Carbohydrates
C) Fatty acids
What role do membrane transport proteins play?
They assist in the movement of substances across the membrane.
True or False: Membranes are static structures.
False
