Lesson 2.1.2
2.1.2 Cell membrane structure and the fluid mosaic model Quiz: Pearson Edexcel Biology, Unit 2
20 questions
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Lesson 2.1.2, Cell membrane structure and the fluid mosaic model: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 2: Genes and Health, written with Revision Ninja.
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The 20 questions
-
Which molecules form the main structural bilayer of a cell membrane?
- Triglycerides
- Glycoproteins
- Cholesterol
- Phospholipids
-
Why are fatty acid tails in phospholipids hydrophobic?
- Non-polar hydrocarbon chains
- Charged amino acids
- Polar phosphate groups
- Ionic hydrocarbon chains
-
Which molecule in animal cell membranes regulates membrane fluidity at high and low temperatures?
- Peripheral protein
- Cholesterol
- Glycoprotein
- Glycolipid
-
What property allows phospholipids and membrane proteins to move laterally within the cell membrane?
- Selective permeability
- Active transport
- Membrane fluidity
- Hydrophilic attraction
-
Which type of protein forms a water-filled pore across the cell membrane?
- Peripheral protein
- Carrier protein
- Glycoprotein
- Channel protein
-
Which membrane protein changes shape to move specific solutes across the phospholipid bilayer?
- Peripheral protein
- Channel protein
- Carrier protein
- Glycoprotein
-
Which component of the cell membrane functions primarily as a cell-surface recognition marker?
- Channel protein
- Glycoprotein
- Cholesterol
- Phospholipid
-
Why is the structure of the cell membrane described as a mosaic?
- Rigid pores
- Symmetrical carbohydrates
- Layered lipids
- Scattered proteins
-
What experimental evidence led to replacing rigid membrane models with the fluid mosaic model?
- Static cholesterol
- DNA structure
- Protein mobility
- Fixed trilayers
-
Why is the fluid mosaic model described as a model rather than a fact?
- Pure speculation
- Mathematically proven
- Unverifiable theory
- Open to revision
-
In a beetroot membrane permeability practical, what does a higher absorbance reading indicate?
- Higher water potential
- Higher permeability
- Lower permeability
- Enzyme denaturation
-
How does ethanol increase the permeability of cell membranes?
- Binds channels
- Denatures water
- Dissolves phospholipids
- Hydrolyses starch
-
Why does high temperature increase the permeability of cell membranes?
- Denatures proteins
- Reduces kinetic energy
- Hydrolyses phospholipids
- Freezes lipids
-
Which variable must be controlled when testing the effect of temperature on beetroot permeability?
- Volume of water
- Absorbance reading
- Pigment concentration
- Incubation temperature
-
Which type of substance diffuses most easily through the hydrophobic core of a membrane?
- Hydrophilic ions
- Large polar
- Small charged
- Small non-polar
-
Why can glucose not cross the cell membrane without a transport protein?
- It is lipid-soluble
- It is hydrophobic
- It is polar
- It is non-polar
-
What term describes molecule movement down a concentration gradient without using ATP?
- Active transport
- Exocytosis
- Endocytosis
- Passive transport
-
Which part of a phospholipid molecule is hydrophilic?
- Glycerol backbone
- Hydrocarbon chain
- Phosphate head
- Fatty acid tail
-
What property allows oxygen to diffuse directly through a phospholipid bilayer?
- Large molecular size
- High electrical charge
- Hydrophilic head binding
- Non-polar nature
-
Which alteration increases the fluidity of a cell membrane phospholipid bilayer?
- Adding cholesterol chains
- More unsaturated tails
- More saturated tails
- Lowering temperature
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