components of the cell membrane Flashcards
What is the primary structure of the cell membrane?
The phospholipid bilayer.
True or False: The cell membrane is permeable to all substances.
False.
Fill in the blank: The hydrophilic heads of phospholipids face ________.
the aqueous environment.
What role do cholesterol molecules play in the cell membrane?
They help to stabilize the membrane’s fluidity.
Which type of proteins span the entire cell membrane?
Integral proteins.
What is the function of peripheral proteins?
They are involved in signaling and maintaining the cell’s shape.
True or False: Glycoproteins are involved in cell recognition.
True.
What are the two main components of the cell membrane?
Lipids and proteins.
Multiple Choice: Which of the following is NOT a function of the cell membrane? A) Protection B) Energy production C) Regulation of transport D) Cell signaling
B) Energy production.
What is the term for the carbohydrate chains attached to proteins and lipids on the cell membrane?
Glycocalyx.
Fill in the blank: The cell membrane is often described as a ________ model.
fluid mosaic.
What is the function of transport proteins in the cell membrane?
They facilitate the movement of substances across the membrane.
True or False: The lipid bilayer is completely rigid.
False.
What are the main types of lipids found in the cell membrane?
Phospholipids, cholesterol, and glycolipids.
Short Answer: Name one type of integral protein.
Channel protein.
Multiple Choice: Which of the following molecules can easily pass through the lipid bilayer? A) Ions B) Water C) Oxygen D) Glucose
C) Oxygen.
What is the main characteristic of the hydrophobic tails of phospholipids?
They repel water.
Fill in the blank: Cell membranes are selectively ________.
permeable.
True or False: All proteins in the cell membrane are embedded within the lipid bilayer.
False.
What is the role of receptors in the cell membrane?
They detect and respond to external signals.
Short Answer: What do we call the process by which cells engulf large particles?
Phagocytosis.
What is the significance of membrane fluidity?
It allows for the movement and functioning of proteins and lipids within the membrane.
Fill in the blank: Membrane proteins can be classified as ________ or peripheral.
integral.
Multiple Choice: Which of the following is a function of the cell membrane? A) DNA replication B) Protein synthesis C) Cell communication D) Photosynthesis
C) Cell communication.
What type of transport requires energy to move substances across the cell membrane?
Active transport.
True or False: Lipid rafts are areas of the membrane that contain a high concentration of cholesterol and proteins.
True.
