1. Oxidative rancidity is typically caused by the reaction of oxygen with which functional group?
With the carbon-carbon double bond in unsaturated fats. (C=C)
2. State the type of lipoproteins that travel through the bloodstream absorbing excess cholesterol and transporting it to the liver for removal from the body.
The High Density Lipoprotein is the one that removes excess cholesterol.
3. One problem associated with consuming too much fat in the diet is obesity. This is because lipids have a higher calorific content than carbohydrate, i.e. they release more __________ per gram.
Energy
4. Which of the following is not an example of a steroid?
Options:
With the carbon-carbon double bond in unsaturated fats. (C=C)
2. State the type of lipoproteins that travel through the bloodstream absorbing excess cholesterol and transporting it to the liver for removal from the body.
The High Density Lipoprotein is the one that removes excess cholesterol.
3. One problem associated with consuming too much fat in the diet is obesity. This is because lipids have a higher calorific content than carbohydrate, i.e. they release more __________ per gram.
Energy
4. Which of the following is not an example of a steroid?
Options:
- testosterone
- phosphatidylcholine
- cholesterol
- progesterone
Testosterone and progesterone are hormones while cholesterol are building blocks of other hormones and steroids.
Phosphatidylcholine is not an steroid.
5. The hydrolysis of a phospholipid would never produce which of the following?
Options:
- A fatty acid
- Glycerol
- A phosphate ion
- Cholesterol
A phospholipid is composed by a glycerol molecule, 2 fatty acid chains and a phosphate group, then, its separation would never produce cholesterol, also because cholesterol is a steroid and it has 3 carbon rings.
6. Phospholipids are similar to triglycerides, except that the glycerol molecule is bonded to two fatty acids and one other group. What is the name of the other group?
Phosphate group.
7. What is the functional group present in all fatty acids?
Options:
- OH
- NH2
- COOH
- C=C
Fatty acids are composed by a carboxylic group and a carbon chain, then COOH group is present in all fatty acids.
8. Which structural feature do fats and oils have in common?
Options:
- They both have ester linkages between the fatty acids and glycerol.
- They both have C=C double bonds.
- They both have peptide linkages between amino acids.
- They both have phosphodiester bonds between the fatty acids and glycerol.
The answer is they both have ester linkages between fatty acids and glycerol, because by the process of condensation, the oxygen bonds to the carbon.
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