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Biomolecules (Biology) · Question 84

AIPMT 2003MCQMedium📈 Topic in 38% papers+4−1
1

In which one of the following nitrogen is not a constituent ?

  1. Pepsin
  2. Invertase
  3. Idioblast
  4. Bacteriochlorophyll

Answer

(3) Idioblast

Solution

Pepsin and invertase are enzymes, i.e., proteins; as per NCERT, amino acids have an amino group, so proteins always contain nitrogen.

⇒ Bacteriochlorophyll, like chlorophyll, has a tetrapyrrole (porphyrin) ring with four nitrogen atoms around a Mg atom.

⇒ An idioblast is a specialised plant cell that stores substances such as tannins, oils, resins or crystals of calcium oxalate (CaC2O4); these stored substances contain no nitrogen.

∴ Nitrogen is not a constituent of idioblast (its stored material).

Answer: (3)

AIPMT 2003

Keep practising — Biomolecules (Biology)

2

Lipids are insoluble in water because lipid molecules are

  1. hydrophilic
  2. hydrophobic
  3. neutral
  4. zwitterions.
AIPMT 2002
3

Which of the following is a reducing sugar?

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

Collagen is:

  1. Globular protein
  2. Fibrous protein
  3. Carbohydrate
  4. Lipid
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5

Most abundant organic compound on earth is

  1. Cellulose
  2. Steroids
  3. Protein
  4. Lipids
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6

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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7

In plants, inulin and pectin are

  1. Excretory material
  2. Reserve material
  3. Insect attracting material
  4. Wastes
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8

Role of enzyme in reactions is to/as

  1. decrease activation energy
  2. increase activation energy
  3. inorganic catalyst
  4. none of the above.
AIPMT 2000
9

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

  1. Substrate
  2. Enzymes
  3. End product
  4. Temperature
AIPMT 2000
10

ATP is

  1. nucleotide
  2. nucleoside
  3. nucleic acid
  4. vitamin.
AIPMT 2000
11

Which of the following have carbohydrate as prosthetic group?

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

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