Explanation
1
A.(Wrong) Short-term energy storage : Short-term is mainly carbohydrates (like glucose).
B. (Correct) Long-term energy storage : Lipids store energy for long periods.
C. (Wrong) Making DNA: DNA is made from nucleotides, not lipids.
D. (Wrong) Producing oxygen: Oxygen is produced mainly by photosynthesis.
2
A. (Wrong) Amino acids, proteins, enzymes, hormones: That’s mostly proteins/ biochem terms.
B. (Correct) Triglycerides, phospholipids, steroids, waxes: These are major lipid groups.
C. (Wrong) Glucose, starch, glycogen, cellulose: These are carbohydrates.
D. (Wrong) DNA, RNA, ribosomes, nucleus : These are nucleic acids/cell structures.
3
A. (Wrong) Soluble: Lipids do not dissolve well in water.
B. (Correct) Insoluble: Lipids are hydrophobic, so they don’t mix with water.
C. (Wrong) Neutralized: “Neutralized” is not a solubility property.
D. (Wrong) Broken down: That refers to digestion, not solubility.
4
A. (Wrong) Hydrophilic : Hydrophilic means water-loving.
B. (Wrong) Hydrostatic : Relates to water pressure, not attraction/repulsion.
C. (Correct) Hydrophobic : Hydrophobic substances repel water.
D. (Wrong) Hypertonic: Relates to concentration in osmosis, not lipid behavior.
5
A. Fats only (Wrong): Triglycerides include fats AND oils.
B. Oils only (Wrong): Not only oils; fats are also triglycerides.
C. Fats and oils (Correct): Both fats and oils are triglycerides.
D. Steroids and waxes (Wrong) : Those are different lipid types.
6
A. Plants — ✅ Correct: plants store oils (like sunflower/canola oil).
B. Animals — ❌ Wrong: animals mainly store fats (solid).
C. Fungi — ❌ Wrong: not the main example highlighted.
D. Humans only — ❌ Wrong: oils exist widely, not only in humans.
7
A. Solid(Wrong): Oils are usually liquid.
B. Liquid(Correct): Oils have more unsaturated fats, so they stay liquid.
C. Gas(Wrong): Oils are not gas at room temperature.
D. Always frozen(Wrong): Not true; only freezes at low temperature.
8
A. Plants — ❌ Wrong: plants mainly store oils (especially in seeds).
B. Animals — ✅ Correct: animals commonly store fat under skin/around organs.
C. Bacteria — ❌ Wrong: not the typical main example in the video.
D. Viruses — ❌ Wrong: viruses don’t store fat as energy reserves.
9
A. Solid (Correct): Fats pack tightly (more saturated), so solid.
B. Liquid (Wrong): That describes oils more.
C. Gas(Wrong): Fats don’t become gas at room temperature.
D. Always dissolved in water(Wrong): Fats are insoluble in water.
10
A. 1 glycerol + 1 fatty acid (Wrong): That would be mono-glyceride (not triglyceride).
B. 1 glycerol + 2 fatty acids (Wrong): That would be di-glyceride.
C. 1 glycerol + 3 fatty acids (Correct): “Tri” means three fatty acids.
D. 3 glycerol + 1 fatty acid (Wrong): Structure is incorrect.
11
A. Acid group ✅ Correct part of fatty acid (carboxyl end).
B. Hydrocarbon chain ✅ Correct part (long carbon chain).
C. Methyl group ✅ Correct part (CH₃ at the end).
D. All of the above ✅ Correct: all are parts of a fatty acid.
12
A. No double bonds — ✅ Correct: only single bonds; fully “saturated” with hydrogen.
B. One double bond — ❌ Wrong: that’s unsaturated.
C. Many double bonds — ❌ Wrong: that’s polyunsaturated.
D. Only phosphate groups — ❌ Wrong: phosphate group is in phospholipids, not fatty acids.
13
A. No double bonds (Wrong): That’s saturated.
B. A double bond that causes a bend/kink (Correct): Cis double bond makes a kink.
C. No carbon atoms (Wrong): Fatty acids are carbon chains.
D. Only glycerol (Wrong): Glycerol is separate; fatty acid is the chain.
14
A. Bent chain because of double bond (Wrong): That’s cis fat.
B. Straight chain even with a double bond (trans) (Correct): Trans keeps a straighter shape.
C. No double bond (Wrong): Trans fats still have a double bond.
D. Made from proteins (Wrong): Fats are not made from proteins.
15
A. 3 fatty acids (Wrong): That’s triglyceride.
B. 2 fatty acids + glycerol + phosphate group (Correct): Structure for phospholipid.
C. Only glucose (Wrong): Glucose is carbohydrate.
D. Only cholesterol (Wrong): Cholesterol is a steroid, not phospholipid.
16
A. Tail (Wrong): Tails are hydrophobic (repel water).
B. Head(Correct): Phosphate head is polar and mixes with water.
C. Entire molecule is hydrophilic (Wrong) : Only head is hydrophilic, tails are not.
D. Double bond (Wrong): Double bond affects shape, not water-loving head.
17
A. DNA strands (Wrong) : DNA is nucleic acid.
B. Cell membrane Bilayers (Correct) : phospholipids form the membrane.
C. Bones (Wrong) : Bones are mostly minerals/collagen.
D. Hair (Wrong): Hair is keratin (protein).
18
A. Triglycerides (Wrong): triglyceride = glycerol + 3 fatty acids.
B. Steroids (Correct): cholesterol has steroid ring structure.
C. Phospholipids (Wrong): phospholipids have phosphate head + 2 tails.
D. Waxes (Wrong): waxes are fatty acids + alcohols.
19
A. Testosterone (Correct): testosterone is a steroid hormone.
B. Glucose (Wrong): glucose is a carbohydrate.
C. Starch (Wrong): starch is a carbohydrate polymer.
D. Water(Wrong): not a lipid and not a steroid
20
A. Proteins (Wrong): proteins are not the focus (amino acids/enzymes not discussed as main).
B. Lipids(Correct): the video explains lipid types, structures, and functions.
C. Carbohydrates (Wrong): carbohydrates (glucose/starch) are not the main content.
D. DNA(Wrong): DNA/genetics is not the focus.
Please, watch and listen the following carefully. Then, anwer the questions. https://www.youtube.com/watch?v=TcMBFSGVi1c
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