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Biomolecules (Biology) · Question 83

AIPMT 2003MCQEasy📈 Topic in 62% papers+4−1
1

The major role of minor elements inside living organisms is to act as

  1. co-factors of enzymes
  2. building blocks of important amino acids
  3. constituent of hormones
  4. binder of cell structure.

Answer

(1) co-factors of enzymes

Solution

Minor (trace) elements such as Zn, Mn, Cu, Mo are needed in very small amounts.

∵ They are not used as structural building material; most of them are metal ions bound to enzymes.

As per NCERT, cofactors may be metal ions, e.g. zinc is a cofactor for the proteolytic enzyme carboxypeptidase.

∴ The major role of minor elements is to act as co-factors (activators) of enzymes.

Answer: (1)

AIPMT 2003

Keep practising — Biomolecules (Biology)

2

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

  1. Pepsin
  2. Invertase
  3. Idioblast
  4. Bacteriochlorophyll
AIPMT 2003
3

Lipids are insoluble in water because lipid molecules are

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

Which of the following is a reducing sugar?

  1. Galactose
  2. Gluconic acid
  3. -methyl galactoside
  4. Sucrose
AIPMT 2002
5

Collagen is:

  1. Globular protein
  2. Fibrous protein
  3. Carbohydrate
  4. Lipid
AIPMT 2002
6

Most abundant organic compound on earth is

  1. Cellulose
  2. Steroids
  3. Protein
  4. Lipids
AIPMT 2001
7

Spoilage of oil can be detected by which fatty acid?

  1. Linolenic acid
  2. Erucic acid
  3. Linoleic acid
  4. Oleic acid
AIPMT 2001
8

In plants, inulin and pectin are

  1. Excretory material
  2. Reserve material
  3. Insect attracting material
  4. Wastes
AIPMT 2001
9

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
10

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

  1. Substrate
  2. Enzymes
  3. End product
  4. Temperature
AIPMT 2000
11

ATP is

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

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