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Biomolecules (Biology) · Question 75

AIPMT 2006MCQEasy📈 Topic in 62% papers+4−1
1

An organic substance bound to an enzyme and essential for its activity is called

  1. isoenzyme
  2. coenzyme
  3. holoenzyme
  4. apoenzyme

Answer

(2) coenzyme

Solution

As per NCERT, many enzymes need non-protein constituents called cofactors bound to the enzyme for catalytic activity; the protein part is the apoenzyme.

∵ Co-enzymes are organic compounds associated with the apoenzyme and essential for its activity (e.g. NAD, NADP, which contain the vitamin niacin).

∵ Apoenzyme + cofactor = holoenzyme; isoenzymes are different molecular forms of the same enzyme ⇒ options (1), (3) and (4) are wrong.

Answer: (2)

AIPMT 2006

Keep practising — Biomolecules (Biology)

2

The catalytic efficiency of two different enzymes can be compared by the

  1. formation of the product
  2. pH of optimum value
  3. Km value
  4. molecular size of the enzyme.
AIPMT 2005
3

Which one of the following statements regarding enzyme inhibition is correct?

  1. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.
  2. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme.
  3. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate.
  4. Non-competitive inhibitors often bind to the enzyme irreversibly.
AIPMT 2005
4

Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

  1. help in regulating metabolism
  2. are exclusively synthesized in the body of a living organism as at present
  3. are conjugated proteins
  4. enhance oxidative metabolism.
AIPMT 2005
5

Which of the following is the simplest amino acid?

  1. Alanine
  2. Asparagine
  3. Glycine
  4. Tyrosine
AIPMT 2005
6

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

  1. base-sugar-phosphate
  2. base-sugar-OH
  3. (base-sugar-phosphate)n
  4. sugar-phosphate
AIPMT 2005
7

Carbohydrates, the most abundant biomolecule on earth, are produced by

  1. some bacteria, algae and green plant cells
  2. fungi, algae and green plant cells
  3. all bacteria, fungi and algae
  4. viruses, fungi and bacteria.
AIPMT 2005
8

With which one of the following enzymes is copper necessarily associated as an activator?

  1. Carbonic anhydrase
  2. Tryptophanase
  3. Lactic dehydrogenase
  4. Tyrosinase
AIPMT 2004
9

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.
AIPMT 2003
10

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

  1. Pepsin
  2. Invertase
  3. Idioblast
  4. Bacteriochlorophyll
AIPMT 2003
11

Lipids are insoluble in water because lipid molecules are

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

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