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Biomolecules (Biology) · Question 58

NEET 2013MCQEasy📈 Topic in 38% papers+4−1
1

Transition state structure of the substrate formed during an enzymatic reaction is

  1. transient and unstable
  2. permanent and stable
  3. transient but stable
  4. permanent but unstable.

Answer

(1) transient and unstable

Solution

As per NCERT, the substrate binds to the active site of the enzyme and is converted through an unstable transition state structure into the product; the formation of the ES complex is a transient phenomenon.

⇒ Any unstable structure that lies in between the stable substrate and the stable product is the transition state.

∴ It is transient and unstable.

Answer: (1)

NEET 2013

Keep practising — Biomolecules (Biology)

2

The essential chemical components of many coenzymes are

  1. carbohydrates
  2. vitamins
  3. proteins
  4. nucleic acids.
NEET 2013
3

Which of the following statements about enzymes is wrong?

  1. Enzymes are denaturated at high temperatures.
  2. Enzymes are mostly proteins but some are lipids also.
  3. Enzymes are highly specific.
  4. Enzymes require optimum pH and temperature for maximum activity.
NEET 2013 (Karnataka)
4

Uridine, present only in RNA is a

  1. nucleoside
  2. nucleotide
  3. purine
  4. pyrimidine.
NEET 2013 (Karnataka)
5

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A - D. Which one of the following options is correct? [figure]

  1. D is an acidic amino acid-glutamic acid.
  2. C is an aromatic amino acid-tryptophan.
  3. A is the C-terminal amino acid and D is N-terminal amino acid.
  4. A is a sulphur containing amino acid methionine.
NEET 2013 (Karnataka)
6

Which one of the following biomolecules is correctly characterized?

  1. Lecithin – a phosphorylated glyceride found in cell membrane.
  2. Palmitic acid – an unsaturated fatty acid with 18 carbon atoms.
  3. Adenylic acid – adenosine with a glucose phosphate molecule.
  4. Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule.
AIPMT 2012 (Mains)
7

For its activity, carboxypeptidase requires

  1. Zinc
  2. iron
  3. niacin
  4. copper
Out of syllabusAIPMT 2012 (Mains)
8

Which one out of A - D given below correctly represents the structural formula of the basic amino acid? [figure]

  1. C
  2. D
  3. A
  4. B
AIPMT 2012 (Prelims)
9

Which one is the most abundant protein in the animal world?

  1. Trypsin
  2. Haemoglobin
  3. Collagen
  4. Insulin
AIPMT 2012 (Prelims)
10

The given diagrammatic representation shows one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component “X” in it. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2012 (Prelims)
11

The curve given below shows enzymatic activity in relation to three conditions (pH, temperature and substrate concentration). What do the two axes (x and y) represent? [figure]

  1. array|l|l| x-axis & y-axis \ enzymatic activity & pH \ array
  2. array|l|l| x-axis & y-axis \ temperature & enzyme activity \ array
  3. array|l|l| x-axis & y-axis \ substrate concentration & enzymatic activity \ array
  4. array|l|l| x-axis & y-axis \ enzymatic activity & temperature \ array
AIPMT 2011 (Prelims)

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