Lesson 2.1.5a
2.1.5a Membrane structure and roles Quiz: OCR Biology, Unit 1
20 questions
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Lesson 2.1.5a, Membrane structure and roles: 20 multiple choice questions for the OCR Biology (H020), Unit 1: Foundations in biology, written with Revision Ninja.
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The 20 questions
-
What does a partially permeable cell membrane allow?
- Active transport only
- Free diffusion
- Total exclusion
- Selective passage
-
Which cell surface membrane component acts as a binding site for hormones?
- Phospholipid heads
- Cholesterol molecules
- Glycolipid chains
- Receptor proteins
-
What is the primary role of internal organelle membranes?
- Energy production
- Compartmentalisation
- Protein synthesis
- Osmotic lysis
-
Which model describes membrane structure as a phospholipid bilayer with embedded mobile proteins?
- Fluid mosaic model
- Globular micelle model
- Unit membrane model
- Sandwich model
-
Which of these is a major component of the fluid mosaic cell membrane?
- Glycogen
- Nucleic acids
- Phospholipids
- Cellulose
-
Why are membrane-bound receptors clinically important for drug action?
- Enzyme digestion
- Lipid synthesis
- DNA replication
- Target binding
-
What is the primary role of cholesterol in animal cell membranes?
- Regulating fluidity
- Catalysing reactions
- Storing energy
- Transporting ions
-
What is a key function of cell surface glycoproteins?
- DNA transcription
- Lipid transport
- ATP production
- Cell recognition
-
What main factor causes beetroot cell membranes to become highly permeable when heated above 45 °C?
- Active transport increase
- Enzyme activation
- Phospholipid solidification
- Protein denaturation
-
How do organic solvents like ethanol increase cell membrane permeability?
- Dissolving membrane lipids
- Hydrolysing ATP
- Denaturing carbohydrates
- Blocking channel proteins
-
In a practical investigating temperature effect on membrane permeability, what is the independent variable?
- Solvent volume
- Temperature
- Membrane thickness
- Pigment absorbance
-
How does cholesterol prevent cell membranes from becoming too rigid at low temperatures?
- Preventing lipid packing
- Binding cell walls
- Increasing active transport
- Denaturing transport proteins
-
Why do lipid-soluble molecules readily cross the cell membrane bilayer?
- Active transport pumps
- Large molecular size
- High electrical charge
- Non-polar nature
-
What is a primary role of membranes located inside organelles like mitochondria?
- Providing structural support
- Creating separate compartments
- Synthesising cell walls
- Generating kinetic energy
-
Which process is demonstrated when a hormone binds a membrane receptor to trigger responses?
- Active transport
- Facilitated diffusion
- Cell signalling
- Endocytosis
-
Why are some membrane proteins restricted in their lateral movement through the bilayer?
- Covalent bonding
- Cytoskeleton attachment
- Cholesterol absence
- Glycoprotein decay
-
Why can medicinal drugs target membrane receptors without entering the cell cytoplasm?
- Drugs dissolve lipids
- Membranes lack pores
- External binding sites
- Receptors exit cells
-
Why does glucose cross the phospholipid bilayer much slower than oxygen?
- Oxygen requires ATP
- Oxygen is charged
- Glucose is non-polar
- Glucose is polar
-
How does high ethanol concentration affect the function of embedded membrane proteins?
- It duplicates receptors
- It denatures proteins
- It activates enzymes
- It freezes channels
-
What happens to phospholipid molecules in a cell membrane as temperature increases?
- Kinetic energy decreases
- Kinetic energy increases
- Phospholipids pack tighter
- Membrane becomes rigid
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