Lesson 3.2.3.1
3.2.3.1 Membrane structure and the fluid mosaic Quiz: AQA Biology, Unit 2
20 questions
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Lesson 3.2.3.1, Membrane structure and the fluid mosaic: 20 multiple choice questions for the AQA Biology (7402), Unit 2: Cells, written with Revision Ninja.
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The 20 questions
-
How are phospholipid tails arranged within the cell surface membrane bilayer?
- Pointing inwards
- Bound to carbohydrates
- Exposed to water
- Pointing outwards
-
Why is the cell membrane structure described as 'fluid' in the fluid mosaic model?
- Lipids are frozen
- Proteins are rigid
- Phospholipids move laterally
- Water flows freely
-
Which two membrane components consist of carbohydrate chains attached to lipids or proteins?
- Glycogen and triglycerides
- Phospholipids and proteins
- Glycolipids and glycoproteins
- Phospholipids and cholesterol
-
What is the main function of cholesterol in eukaryotic cell surface membranes?
- Restricting membrane fluidity
- Increasing membrane permeability
- Synthesising ATP molecules
- Transporting glucose actively
-
How does organelle membrane structure compare to cell surface membrane structure in eukaryotes?
- Same basic structure
- Purely protein structure
- Lacks phospholipid bilayer
- Completely different structure
-
What type of membrane protein forms a water-filled pore for ion transport?
- Carrier protein
- Glycoprotein
- Channel protein
- Receptor protein
-
Which region of the phospholipid bilayer repels polar molecules?
- Hydrophilic heads
- Extrinsic proteins
- Phosphate groups
- Hydrophobic core
-
Which membrane molecule acts as a surface marker for cell recognition?
- Cholesterol
- Phospholipid
- Glycoprotein
- Carrier protein
-
Which membrane component helps regulate fluidity at varying temperatures?
- Glycolipid
- Peripheral protein
- Cholesterol
- Phospholipid head
-
What chemical property of fatty acid tails prevents polar molecules crossing membranes?
- Charged
- Hydrophobic
- Hydrophilic
- Polar
-
Which molecule in the cell membrane consists of a carbohydrate attached to a lipid?
- Glycoprotein
- Phospholipid
- Lipoprotein
- Glycolipid
-
Why are membrane proteins described as a mosaic in the fluid mosaic model?
- They are fixed
- They are scattered
- They are identical
- They form layers
-
Which membrane component dissolves rapidly when exposed to alcohol or non-polar solvents?
- Intrinsic proteins
- Extrinsic proteins
- Phospholipids
- Glycoproteins
-
Increasing the concentration of carrier proteins in a membrane increases the rate of what?
- Endocytosis
- Simple diffusion
- Facilitated diffusion
- Osmosis
-
What component forms the main continuous structural framework of the cell membrane?
- Glycoproteins
- Cholesterol layer
- Protein matrix
- Phospholipid bilayer
-
How do membrane folds like microvilli increase the rate of nutrient absorption?
- Increasing gradient
- Adding energy
- Decreasing temperature
- Increasing surface area
-
What term describes a membrane that allows only specific substances to pass through?
- Fully permeable
- Impermeable
- Non-polar
- Selectively permeable
-
Why is the cell membrane described as fluid in the fluid mosaic model?
- Lipids freeze
- Membranes evaporate
- Phospholipids can move
- Proteins dissolve
-
Which membrane component acts as a specific cell-surface receptor for hormones?
- Glycoprotein
- Phospholipid
- Triglyceride
- Cholesterol
-
Which term describes proteins that extend through the whole phospholipid bilayer?
- Histone proteins
- Integral (transmembrane) proteins
- Cellulose microfibrils
- Ribosomal RNA molecules
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