Chemistry of Lipids: Definition and Functions

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31 Questions

Which of the following is a common property of lipids?

Relatively insoluble in water and soluble in nonpolar solvents

What is the main function of lipids as thermal insulators?

To serve as thermal insulators in subcutaneous tissues and around certain organs

What is the main role of lipoproteins in the body?

To transport lipids in the blood

Which type of lipids provide shape and contour to the body?

Phospholipids

Which disease is associated with abnormal metabolism of lipids?

All of the above

What is the preferable source of energy, compared to lipids?

Carbohydrates

Which type of lipid is an ester of fatty acids with glycerol?

Simple lipids

What is the general formula for saturated fatty acids?

$CnH_{2n+1}COOH$

Which type of fatty acid contains one double bond?

Monounsaturated (MUFA)

What are the esters of fatty acids with higher molecular weight monohydric alcohols called?

Waxes

Which type of fatty acid is envisaged as based on acetic acid as the first member of the series?

Saturated fatty acids

What is the common name for Octadecanoic acid?

Stearic acid

Which lipid molecule is derived from simple/compound lipids on their hydrolysis?

Fatty acids

What is the molecular formula for Butyric acid?

$CH_3(CH_2)_2COOH$

Which type of fatty acid contains no double bonds with 2-24 or more carbons?

$Saturated Fatty Acids$

Which type of carbohydrate contains more than 10 monosaccharide units?

Polysaccharides

What is the main function of glycogen in the body?

Act as a storage form of energy

Which type of dietary fiber is not broken down by digestive enzymes in the small intestine?

Insoluble fiber

What is the general classification of carbohydrates that contain 3-10 monosaccharide units?

Oligosaccharides

Which carbohydrate is also called hydrate of carbons?

Glucose

Where are excess glucose stored in the body?

In the liver and muscles as glycogen

What is the main difference between soluble fiber and insoluble fiber?

Soluble fiber dissolves in water and forms a gel-like substance, while insoluble fiber does not dissolve in water and adds bulk to stool.

What is the recommended daily intake of fiber for men?

38 grams

What is the role of mucopolysaccharides in the body?

Maintain the structure and function of connective tissue

What is an example of a mucopolysaccharide?

Hyaluronic acid

What are some health benefits of dietary fiber?

Reduced risk of heart disease

Which food sources are high in dietary fiber?

Fruits, vegetables, whole grains, legumes, and nuts

How does soluble fiber affect blood sugar levels?

It helps to regulate blood sugar levels by slowing down the absorption of sugar into the bloodstream

Where are mucopolysaccharides found in the body?

In cartilage, tendons, ligaments, and bodily fluids

What is the primary function of insoluble fiber?

Adding bulk to stool

What role does hyaluronic acid play in the body?

It helps maintain the structure and function of connective tissue

Study Notes

Lipids

  • Lipids have the common property of being insoluble in water
  • Lipids function as thermal insulators, retaining body heat
  • Lipoproteins play a crucial role in transporting fats and cholesterol in the bloodstream
  • Phospholipids provide shape and contour to the body
  • Abnormal metabolism of lipids is associated with atherosclerosis
  • Carbohydrates are a preferable source of energy compared to lipids
  • Triglycerides are esters of fatty acids with glycerol
  • The general formula for saturated fatty acids is CnH2n+2
  • Monounsaturated fatty acids contain one double bond
  • Wax esters are esters of fatty acids with higher molecular weight monohydric alcohols
  • Acylglycerols are envisioned as based on acetic acid as the first member of the series
  • Stearic acid is also known as Octadecanoic acid
  • Fatty acids and glycerol are derived from simple/compound lipids on their hydrolysis
  • The molecular formula for Butyric acid is C4H8O2
  • Saturated fatty acids contain no double bonds with 2-24 or more carbons

Carbohydrates

  • Oligosaccharides are carbohydrates that contain 3-10 monosaccharide units
  • Glycogen is the storage form of carbohydrates in the body
  • Soluble fiber is not broken down by digestive enzymes in the small intestine
  • Carbohydrates are also called hydrates of carbon
  • Excess glucose is stored in the liver and muscles as glycogen
  • Soluble fiber dissolves in water, forming a gel-like substance, whereas insoluble fiber does not dissolve
  • The recommended daily intake of fiber for men is 38 grams
  • Mucopolysaccharides play a role in the structure and function of connective tissue
  • Hyaluronic acid is an example of a mucopolysaccharide
  • Dietary fiber has various health benefits, including promoting regular bowel movements and supporting healthy blood sugar levels
  • Foods high in dietary fiber include fruits, vegetables, and whole grains
  • Soluble fiber helps regulate blood sugar levels
  • Mucopolysaccharides are found in connective tissue, such as skin, bones, and tendons
  • Insoluble fiber helps promote regular bowel movements and prevents constipation
  • Hyaluronic acid plays a role in maintaining skin hydration and joint health

Explore the definition of lipids as a diverse group of compounds, including fats, oils, steroids, and waxes, characterized by their physical properties. Learn about their functions as a storage form of energy and more through this quiz.

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