Exam2 Cell Membrane Flashcards
What is the primary function of the cell membrane?
To protect the cell and regulate what enters and exits.
What is the basic structure of the cell membrane?
A phospholipid bilayer.
Fill in the blank: The hydrophilic heads of phospholipids face _____.
outward, toward the water.
What is the role of cholesterol in the cell membrane?
To maintain membrane fluidity.
What term describes the selective permeability of the cell membrane?
Fluid mosaic model.
True or False: Carbohydrates on the cell membrane play a role in cell recognition.
True
What is the process by which molecules move across the membrane without energy?
Passive transport.
Fill in the blank: Active transport requires _____ to move substances against their concentration gradient.
energy (ATP).
What is endocytosis?
The process by which cells take in substances by engulfing them.
What is exocytosis?
The process by which cells expel materials in vesicles.
Multiple Choice: Which type of transport does NOT require energy? A) Active transport B) Facilitated diffusion C) Osmosis D) Both B and C
D) Both B and C
What is osmosis?
The diffusion of water across a selectively permeable membrane.
True or False: Ion channels are a type of integral protein that facilitates the passive transport of ions.
True
What are glycoproteins?
Proteins with carbohydrate chains attached that are involved in cell recognition.
Fill in the blank: The cell membrane is described as a _____ because of its flexible nature.
fluid structure.
What is the significance of the term ‘mosaic’ in the fluid mosaic model?
It refers to the patchwork of diverse protein molecules embedded in the phospholipid bilayer.