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Biomolecules (Biology) · Question 86

AIPMT 2002MCQMedium📈 Topic in 12% papers+4−1
1

Which of the following is a reducing sugar?

  1. Galactose
  2. Gluconic acid
  3. -methyl galactoside
  4. Sucrose

Answer

(1) Galactose

Solution

A reducing sugar has a free (or potentially free) aldehyde or ketone group at its anomeric carbon, which reduces Fehling's / Benedict's solution.

⇒ Galactose is an aldohexose whose anomeric carbon is free, so it is a reducing sugar.

⇒ In -methyl galactoside the anomeric -OH is replaced by -OCH3 (glycoside), so the ring cannot open – non-reducing.

⇒ Sucrose is non-reducing because the anomeric carbons of glucose and fructose are joined in the glycosidic bond.

⇒ Gluconic acid is an oxidised product (aldonic acid) and has no free aldehyde group.

∴ Galactose is a reducing sugar.

Answer: (1)

AIPMT 2002

Keep practising — Biomolecules (Biology)

2

Collagen is:

  1. Globular protein
  2. Fibrous protein
  3. Carbohydrate
  4. Lipid
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3

Most abundant organic compound on earth is

  1. Cellulose
  2. Steroids
  3. Protein
  4. Lipids
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4

Spoilage of oil can be detected by which fatty acid?

  1. Linolenic acid
  2. Erucic acid
  3. Linoleic acid
  4. Oleic acid
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5

In plants, inulin and pectin are

  1. Excretory material
  2. Reserve material
  3. Insect attracting material
  4. Wastes
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6

Role of enzyme in reactions is to/as

  1. decrease activation energy
  2. increase activation energy
  3. inorganic catalyst
  4. none of the above.
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7

Which factor is responsible for inhibition of enzymatic process during feedback?

  1. Substrate
  2. Enzymes
  3. End product
  4. Temperature
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8

ATP is

  1. nucleotide
  2. nucleoside
  3. nucleic acid
  4. vitamin.
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9

Which of the following have carbohydrate as prosthetic group?

  1. Glycoprotein
  2. Chromoprotein
  3. Lipoprotein
  4. Nucleoprotein
AIPMT 2000
10

Essential amino acid is

  1. phenylalanine
  2. glycine
  3. aspartic acid
  4. serine
Out of syllabusAIPMT 2000

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