32 Questions
What is the function of the cell membrane?
To maintain the medium for the cell's survival
Which type of substance makes up approximately 40% of the composition of the cell membrane?
Lipids
What is the significance of the 'fluid mosaic model' in the structure of the cell membrane?
It allows free exchange of substances between extracellular and intracellular fluids
Which characteristic is specific to neurons regarding reproduction?
Does not reproduce
What is the function of proteins in the cell membrane?
To allow free exchange of substances between ECF and ICF
What is the role of carbohydrates in the cell membrane?
To regulate the entry of invaders into the body
Which type of molecules form the major lipids in the lipid layer of the cell membrane?
Phospholipids
What is the function of cholesterol in the lipid layer of the cell membrane?
To maintain the structural integrity of the cell membrane
What are the two categories of protein molecules present in the protein layers of the cell membrane?
Integral proteins and peripheral proteins
Which type of proteins provide a route for the diffusion of water-soluble substances like glucose and electrolytes through the cell membrane?
Channel proteins
What characterizes channel proteins in the cell membrane in terms of permeability?
They permit only one type of ion to pass through them
What is the function of peripheral proteins in the cell membrane?
To facilitate cell signaling processes
Which substance is responsible for maintaining the fluid nature of the lipid layer in the cell membrane?
'Tail' portion of phospholipids
What is the outer part of a phospholipid molecule that faces the extracellular fluid?
'Head' portion
What type of substances are allowed to pass through the semi-permeable lipid layer of the cell membrane?
Fat-soluble substances only
What are the two categories into which protein molecules in the cell membrane are classified?
Integral proteins and glycoproteins
The cell membrane separates the intracellular fluid (ICF) from the extracellular fluid (ECF).
True
Neurons are capable of reproducing through division.
False
The cell membrane is primarily composed of lipids.
True
The 'fluid mosaic model' describes the structure of the cell membrane as a rigid and fixed layer.
False
The cell membrane is impermeable to all substances.
False
Cholesterol does not play a role in the lipid layer of the cell membrane.
False
The lipid layer of the cell membrane is semi-permeable and allows water-soluble materials to pass through.
False
The central layer of the cell membrane is formed by protein substances.
False
The phospholipid molecules in the lipid layer have a hydrophilic head portion that faces the cytoplasm.
False
Peripheral proteins are tightly bound with the cell membrane.
False
Cholesterol in the cell membrane helps to maintain the fluid nature of the lipid layer.
False
Integral proteins provide routes for diffusion of water-soluble substances like glucose and electrolytes through the cell membrane.
True
Channel proteins in the cell membrane are not characterized by selective permeability.
False
The protein layers of the cell membrane are situated on either side of the central lipid layer.
True
The major lipids in the lipid layer of the cell membrane are phospholipids and glycolipids.
False
The carbohydrate molecules in the cell membrane play a role in maintaining its structural integrity.
False
Learn about the general characteristics of cells in the human body, including their nutritional needs, energy production, waste elimination, and response to threats. Explore the structure and functions of cells as explained by Dr. Govand Sh Tawfeeq in the 2nd lecture of Physiology 1 on Saturday, 14th October 2023.
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