Biological molecules: lipids
20 review questions with answers for Biological molecules: lipids. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Main energy-storage lipid in adipose tissue?
- TriglycerideRight answer
- Phospholipid
- Steroid
- Wax
What this set covers
Triglycerides, phospholipids and steroids are covered, including ester bonds, saturated and cis or trans fatty acids, the hydrophilic heads and hydrophobic tails of a bilayer, cholesterol, adipose tissue, and the SHIPS list of lipid functions.
- Common mix-up
- Students often mix up hydrophobic and hydrophilic, and so put the wrong end of a phospholipid facing the water: the phosphate heads face the water and the fatty acid tails point inwards.
- Review tip
- Draw a phospholipid bilayer from memory, label heads and tails with the correct water-loving or water-repelling term, then write out SHIPS and one example for each letter.
All 20 questions and answers
Main energy-storage lipid in adipose tissue?
Answer: Triglyceride
A triglyceride forms by condensation between one glycerol and…?
Answer: Three fatty acids
Bond that joins a fatty acid to glycerol?
Answer: Ester bond
Number of water molecules released when one triglyceride forms?
Answer: 3
Fatty acid with no C=C double bonds in its chain?
Answer: Saturated
Unsaturated fatty acid with its H atoms on the same side of a C=C bond, giving a kinked chain?
Answer: Cis
Shape of the chain of a trans-unsaturated fatty acid?
Answer: Straight
Lipid that forms the bilayer of cell membranes?
Answer: Phospholipid
In a membrane bilayer, which part of each lipid molecule faces the watery surroundings?
Answer: Phosphate heads
Water-repelling property that makes fatty acid tails point inwards in a bilayer?
Answer: Hydrophobic
Term for a molecule, such as a phospholipid, with both a water-loving and a water-repelling part?
Answer: Amphipathic
Type of lipid built from four fused carbon rings?
Answer: Steroid
Female sex hormone that is a steroid?
Answer: Oestrogen
Lipid that is not made from glycerol and fatty acids?
Answer: Cholesterol
In the SHIPS list of lipid functions, what does the H stand for?
Answer: Hormones
In the SHIPS list of lipid functions, the P stands for protection of…?
Answer: Organs
Energy released per gram by lipids compared with carbohydrates?
Answer: About twice as much
Property of lipids that means large stores do not affect osmosis?
Answer: Insoluble in water
Fat-storing tissue under the skin that insulates the body?
Answer: Adipose tissue
Advantage of glycogen over fat as a human energy store?
Answer: Can be mobilised rapidly
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.