Sample 1Easy
Which of the following polysaccharides is a polymer of fructose?
- A
Cellulose
- B
Glycogen
- C
Inulin
- D
Starch
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The answer is C.Inulin is a polymer of fructose. Cellulose, starch and glycogen are all homopolymers of glucose.
- A.
Cellulose is a homopolymer of glucose.
- B.
Glycogen, the animal storage polysaccharide, is a polymer of glucose.
- D.
Starch, the plant storage polysaccharide, is a polymer of glucose.
NCERT: Class 11 Biology, Chapter 9 (Biomolecules), Polysaccharides
Sample 2Medium
A figure shows the structure of a compound: a five-carbon ribose sugar ring, with the nitrogen base adenine attached to its first carbon and a phosphate group esterified to the hydroxyl group of its fifth carbon. If the phosphate group is removed, what compound is left?
- A
Adenylic acid, a nucleotide
- B
Adenosine, a nucleoside
- C
Adenine, a purine base
- D
Ribose, a pentose sugar
Show the answer
The answer is B.A nitrogen base attached to a sugar is a nucleoside, such as adenosine. When a phosphate is also esterified to the sugar it becomes a nucleotide, such as adenylic acid. Removing the phosphate from adenylic acid leaves adenosine.
- A.
Adenylic acid is the compound in the figure: base, sugar and phosphate together form a nucleotide. Removing the phosphate leaves a nucleoside.
- C.
Adenine alone is left only if the sugar is removed as well. With the sugar still attached, the compound is a nucleoside.
- D.
Ribose alone is left only if both the base and the phosphate are removed.
NCERT: Class 11 Biology, Chapter 9