14 Questions
Which of the following is NOT a function of lipids?
Serving as precursors for amino acids
What type of small molecules can lipids be broadly defined as?
Amphiphilic
Which category of lipids are triglycerides a part of?
Glycerolipids
From which distinct types of biochemical subunits do biological lipids originate?
Ketoacyl and isoprene groups
What kind of metabolites do lipids encompass apart from fatty acids and their derivatives?
Sterol-containing metabolites
What structures can the amphiphilic nature of some lipids allow them to form?
Vesicles and liposomes
What was the first synthetic triglyceride reported?
Tributyrin
Who discovered phospholipids in mammalian brain and hen egg?
Theodore Gobley
Who proposed the substitution of 'lipoid' by 'lipin' in 1912?
Rosenbloom and Gies
Whose student synthesized tristearin and tripalmitin by reaction of the analogous fatty acids with glycerin?
Marcellin Berthelot
In 1923, who introduced the word 'lipide'?
Gabriel Bertrand
Who classified lipids in two categories as suifs and huiles in 1815?
Henri Braconnot
Who recognized fat along with protein and carbohydrate as an important nutrient for humans and animals in 1827?
William Prout
In 1947, who defined 'simple lipids' as greases and waxes?
T. P. Hilditch
Study Notes
Lipid Functions and Types
- Lipids are not a source of energy in the body.
Lipid Classification
- Lipids are broadly defined as amphipathic molecules, including fats, oils, waxes, and related compounds.
- Triglycerides are a type of neutral lipid.
Origin of Lipids
- Biological lipids originate from two distinct types of biochemical subunits: fatty acids and glycerol.
Lipid Metabolites
- Apart from fatty acids and their derivatives, lipids encompass steroids, including cholesterol and bile acids.
Lipid Structures
- The amphiphilic nature of some lipids allows them to form micelles, liposomes, and biological membranes.
History of Lipid Research
- The first synthetic triglyceride reported was tristearin.
- Phospholipids in mammalian brain and hen egg were discovered by Maurice Michel.
- The term 'lipin' was proposed by Roscoe in 1912 as a substitute for 'lipoid'.
- Victor Grignard's student synthesized tristearin and tripalmitin by reacting glycerin with the respective fatty acids.
- The term 'lipide' was introduced by Rosenmund in 1923.
- Chevreul classified lipids into two categories: suifs (solid fats) and huiles (oils) in 1815.
- Magendie recognized fat, along with protein and carbohydrate, as an important nutrient for humans and animals in 1827.
- In 1947, Bloor defined 'simple lipids' as greases and waxes.
Explore the functions and applications of lipids in various industries, as well as their role as energy stores and structural components of cell membranes.
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