Which one of the following artificial sweeteners is modified sugar ?
- A.Aspartame
- B.Saccharin
- C.Sucralose
- D.Alitame
Correct answer
Explanation
The correct answer is C, Sucralose. Sucralose is made from ordinary table sugar, sucrose, by changing its molecule.
In making sucralose, three hydroxyl (OH) groups of the sucrose molecule are replaced by chlorine atoms. This small change makes it about 600 times sweeter than sugar, and the body cannot break it down for energy, so it adds almost no calories. It is also stable on heating, which is why it can be used in baking and cooking, unlike some other sweeteners. Because it begins as real sugar, sucralose is described as a modified sugar, while the other sweeteners in the list are not built on a sugar molecule.
A is wrong: aspartame is a dipeptide made from two amino acids, aspartic acid and phenylalanine.
B is wrong: saccharin, the oldest artificial sweetener, is a sulphur and nitrogen compound made from coal-tar chemicals, not from sugar.
D is wrong: alitame is also an amino-acid based dipeptide sweetener.
Exam tip: Sucralose = chlorinated sucrose (heat-stable); aspartame and alitame = dipeptides; saccharin = oldest, about 300 to 500 times sweeter than sugar.
Practice Questions
View allThe principle involved in paper chromatography is
- A.Absorption
- B.Partition
- C.Solubility
- D.Volatility
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Paper chromatography separates substances because each one divides, or partitions, itself differently between two liquid phases. In paper chromatography the stationary phase is the water held in the cellulose fibres of the paper, and the mobile phase is the solvent that rises up the paper by capillary action.
Read the full explanation →Which one of the following phenomena CANNOT be exhibited by sound waves ?
- A.Reflection
- B.Refraction
- C.Interference
- D.Polarisation
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Sound in air is a longitudinal wave, and only transverse waves can be polarised. Polarisation means restricting the vibrations of a wave to a single plane.
Read the full explanation →Which one of the following is NOT a luminous object ?
- A.Sun
- B.Electric lamp
- C.Candle
- D.Moon
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The Moon gives out no light of its own; it only reflects sunlight, so it is a non-luminous object. A luminous object produces and emits its own light, while a non-luminous object is seen only because it reflects light falling on it.
Read the full explanation →In experiment #1, a bar magnet is moved towards a conducting wire loop axially, with the magnet's north pole facing the loop. In experiment #2, the same process as in experiment #1 is repeated except that the south pole of the magnet faces the loop. Which one of the following statements is true in this context?
- A.The direction of current in the loop will be of opposite nature in both the experiments.
- B.The direction of current in the loop will be the same in both the experiments.
- C.No current will flow in either of the two experiments.
- D.More current will flow in the loop in experiment #1.
Show answer
Reversing the pole that approaches the loop reverses the change in magnetic flux, so the induced current reverses too. When a magnet moves towards a closed loop, the magnetic flux through the loop changes and an electric current is induced (Faraday's law of electromagnetic induction).
Read the full explanation →Which one of the following statements about classification of plants is correct?
- A.Thallophytes have well differentiated body design
- B.Funaria is a fungus
- C.All Pteridophytes are Phanerogams
- D.Vascular system is not found among Bryophytes
Show answer
Mosses and liverworts have no xylem or phloem, so water moves through them cell to cell. Bryophytes, such as Funaria (a moss) and Marchantia (a liverwort), are called the amphibians of the plant kingdom because they live on land but need water for fertilisation.
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