Lesson 1.4.3
1.4.3 Triglycerides, saturated and unsaturated lipids Quiz: Pearson Edexcel Biology, Unit 1
20 questions
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Lesson 1.4.3, Triglycerides, saturated and unsaturated lipids: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 1: Lifestyle, Health and Risk, written with Revision Ninja.
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The 20 questions
-
What type of bond links glycerol to each fatty acid in a triglyceride?
- Glycosidic bond
- Hydrogen bond
- Peptide bond
- Ester bond
-
How many fatty acids are joined to one glycerol molecule in a triglyceride?
- 2
- 1
- 4
- 3
-
How many water molecules are removed when one triglyceride is formed from one glycerol and three fatty acids?
- 1
- 2
- 3
- 6
-
What type of carbon-carbon bonds are found in a saturated fatty acid chain?
- Alternating double bonds
- Only double bonds
- One double bond
- Only single bonds
-
Why are saturated fats usually solid at room temperature?
- Chains have kinks
- Chains pack closely
- Chains form polymers
- Chains repel lipids
-
What structural feature of unsaturated fatty acids causes lower melting points?
- Chain kinks
- Ester linkages
- Peptide bonds
- Hydrogen bonds
-
Why do triglycerides store more energy per gram than carbohydrates?
- More C-O bonds
- More C-H bonds
- Fewer ester bonds
- Lower molecular mass
-
Hydrolysis of one triglyceride yields glycerol and how many fatty acids?
- Two
- One
- Three
- Four
-
Which enzyme hydrolyses triglycerides during digestion?
- Protease
- Maltase
- Amylase
- Lipase
-
How many water molecules are released during the formation of one triglyceride?
- Three
- Four
- Two
- One
-
Which of these food items is a rich source of unsaturated fats?
- Olive oil
- Beef fat
- Lard
- Butter
-
What happens to the melting point of unsaturated vegetable oil after hydrogenation?
- It stays unchanged
- It increases
- It decreases
- It drops significantly
-
Compared to 1 g of glycogen, how much energy does 1 g of triglyceride release?
- The same amount
- About ten times
- About double
- About half
-
High intake of saturated fat increases cardiovascular disease risk by raising blood levels of what?
- HDL cholesterol
- LDL cholesterol
- Haemoglobin
- Blood glucose
-
How many carbon-carbon double bonds are in a monounsaturated fatty acid?
- Three
- None
- One
- Two
-
Which chemical property of fatty acid chains makes triglycerides insoluble in water?
- High density
- Non-polar nature
- Polar nature
- Ionic bonding
-
Which bond type is present in unsaturated triglycerides but absent in saturated triglycerides?
- C-H single bonds
- C=C double bonds
- C-O single bonds
- Ester bonds
-
Which bond type is present in a higher proportion in triglycerides than in carbohydrates?
- C-O bonds
- O-H bonds
- C=O bonds
- C-H bonds
-
How many fatty acid chains bind to one glycerol molecule in a triglyceride?
- Two
- Three
- Four
- One
-
What molecule is released during the formation of each ester bond in a triglyceride?
- Hydrogen
- Water
- Carbon dioxide
- Glucose
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