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Standard XII
Biology
Amino Acids
Question

Pick out wrong statement.
  1. Proteins are linear chains of amino acids linked by peptide bonds
  2. Cellulose is a homopolymer
  3. Inulin is polymer of glucose
  4. RuBisCO is the most abundant protein in the whole biosphere
  5. Chitin is a heteropolymer

A
Cellulose is a homopolymer
B
Chitin is a heteropolymer
C
Proteins are linear chains of amino acids linked by peptide bonds
D
RuBisCO is the most abundant protein in the whole biosphere
E
Inulin is polymer of glucose
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Solution
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Answer is option C i.e. "Inulin is polymer of glucose"
Inulin is a heterogeneous blend of fructose polymers found widely distributed in nature as plant storage carbohydrates. Inulin is a heterogeneous collection of fructose polymers. It consists of chain-terminating glucosyl moieties and a repetitive fructosyl moiety, which are linked by β(2,1) bonds.

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Similar Questions
Q1

Which of the following statement(s) is false, regarding Proteins ?

I. A protein is a heteropolymer but not a homopolymer.

II. Collagen is the most abundant protein in the animal world.

III. RUBISCO is the most abundant protein in the biosphere.

IV The first amino acid in a polypeptide chain is C- terminal amino acid and the last is N- terminal amino acid.


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Q2
A linear arrangement of amino acids linked by peptide bonds, forms the _____ structure of protein.
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Q3
Assertion :A protein is a heteropolymer. Reason: Dietary proteins are the source of non- essential amino acids.
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Q4
Which of the following statements are true?
(a) Proteins are the heteropolymer of α-amino acid.
(b) Sugar found in nucleic acid, is in the form of β-form.
(c) Nucleic acids show acidic nature.
(d) 5-methyl uracil binds with the first carbon atom of the ribose sugar.
(e) Collagen is the most abundant protein in the plant world.
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Q5

Enzymes are proteins. Proteins are long chains of amino acids linked to each other by peptide bonds. Amino acids have many functional groups in their structure.

These functional groups are many of them at least, ionisable. As they are weak acids and bases in chemical nature, this iohisation is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below, explain briefly.

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