21/08/2023
Chapter 1, FSC Biology
Topic Cell memberane
1.Which of the following best describes the structure of a cell membrane?
a) A rigid and impermeable barrier
b) A fluid mosaic of lipids and proteins
c) A crystalline lattice of carbohydrates
d) A dense network of nucleic acids
2.What is the primary function of phospholipids in the cell membrane?
a) To provide structural support
b) To facilitate active transport
c) To regulate gene expression
d) To form a selectively permeable barrier
3.Cholesterol is a component of the cell membrane. What role does cholesterol play in the membrane?
a) It makes the membrane rigid and inflexible.
b) It increases the permeability of the membrane.
c) It helps maintain membrane fluidity and stability.
d) It acts as a receptor for extracellular signals.
4.Which statement accurately describes the fluid mosaic model of the cell membrane?
a) The membrane is composed of a solid lattice of lipids and proteins.
b) The membrane is completely impermeable to all substances.
c) The membrane is a dynamic structure with lipids and proteins in constant motion.
d) The membrane has a uniform composition across its entire surface.
5.Which of the following processes does NOT require energy to move substances across the cell membrane?
a) Active transport
b) Simple diffusion
c) Facilitated diffusion
d) Osmosis
6. Which type of transport requires the assistance of carrier proteins embedded in the cell membrane?
a) Passive transport
b) Facilitated diffusion
c) Active transport
d) Bulk transport
7.In a hypertonic solution, how does water move across the cell membrane?
a) Water moves into the cell
b) Water moves out of the cell
c) Water movement is equal in both directions
d) Water does not move across the membrane
8.What is the primary role of integral membrane proteins?
a) To anchor the cell membrane to the cytoskeleton
b) To act as receptors for signaling molecules
c) To store energy for cellular processes
d) To facilitate DNA replication
9.Which type of cell junction is responsible for forming a strong mechanical link between adjacent cells?
a) Gap junctions
b) Tight junctions
c) Plasmodesmata
d) Desmosomes
10.How do cells achieve selective permeability in the cell membrane?
a) By allowing all substances to freely pass through
b) By using active transport exclusively
c) By regulating the movement of substances based on size, charge, and concentration
d) By preventing any molecules from passing through
