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WorksheetsTopic 16: Lipids
Total questions: 13
Worksheet time: 7mins
What is the primary structural component of phospholipids?
Glycerol backbone
Steroid ring
Terpene unit
Amino acid chain
Which part of the phospholipid is hydrophilic?
Fatty acid tails
Phosphate group
Steroid core
Terpene chain
What is the role of phospholipase enzymes?
Synthesise phospholipids
Break down phospholipids
Transport phospholipids
Convert phospholipids into proteins
Which of the following is a characteristic of the mosaic model of cell membranes?
Uniform distribution of proteins
Random distribution of lipids
Fluid combination of lipids and proteins
Rigid structure with fixed components
In the mosaic model, what is the function of cholesterol?
Increase membrane fluidity
Decrease membrane fluidity
Act as a protein anchor
Serve as a carbohydrate source
What are terpenes primarily composed of?
Amino acids
Isoprene units
Fatty acids
Nucleotides
What is the role of phospholipids in cell membranes?
Provide energy
Act as enzymes
Form a bilayer structure
Store genetic information
Which method could you use to distinguish two chemically distinct phospholipids by chemical, physical or enzymatic tests?
Treat samples with a phospholipase and detect free fatty acid release by gas chromatography
Detect their polar headgroups by gas chromatography and compare with standards
Combine hydrolysates with 1-Fluoro-2,4-dinitrobenzene (FDNB) to check for the formation of a coloured product
Confirm the melting point of phospholipids are different
What is the significance of the fluidity in cell membranes?
It allows for the rigid structure of the cell
It enables the movement of proteins and lipids
It prevents the entry of water
It stabilises the cell membrane
Which of the following is NOT a function of terpenes?
Pigmentation
Photosynthesis
Structural support
Antioxidant activity
What is the name of the fatty acid shown?
18:3 cis,cis,cis-Δ9,Δ12,Δ15 α-linoleic acid
18:3 cis,cis,cis-Δ6,Δ9,Δ12 γ-linoleic acid
18:4 cis,cis,cis,cis-Δ6,Δ9,Δ12,Δ15 stearidonic acid
18:3 cis,trans,cis-Δ9,Δ12,Δ15 α-linoleic acid
Which of the following best describes the mosaic model of cell membranes?
A static structure with fixed components
A dynamic structure with mobile components
A rigid structure with immobile proteins
A crystalline structure with uniform distribution
How many isoprene units in this molecule
4
5
6
7
