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Biomolecules

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2001

Which of the following is correct?

  1. Cycloheptane is an aromatic compound.
  2. Diastase is an enzyme
  3. Acetophenone is an ether.
  4. All of these.

Answer

(2) Diastase is an enzyme

Solution

(1) Incorrect: cycloheptane is a saturated cycloalkane; it has no ring of delocalised π electrons, so it is not aromatic.

(2) Correct: diastase is an enzyme (present in malt) which hydrolyses starch to maltose.

(3) Incorrect: acetophenone, C6H5COCH3, is a ketone, not an ether.

Only statement (2) is correct, so (4) is also wrong.

Answer: (2)

Keep practising — Biomolecules

Ques. 2AIPMT 2001

Which is the correct statement?

  1. Starch is a polymer of -glucose.
  2. Amylose is a component of cellulose.
  3. Proteins are composed of only one type of amino acid.
  4. In cyclic structure of fructose, there are four carbons and one oxygen atom.
Ques. 3AIPMT 2001

[figure] Which statement is incorrect about peptide bond?

  1. C-N bond length in proteins is longer than usual bond length of N-C bond.
  2. Spectroscopic analysis shows planar structure of [figure] group.
  3. C-N bond length in proteins is smaller than usual bond length of C-N bond.
  4. None of the above.
Ques. 4AIPMT 2000

-D-glucose and -D-glucose are

  1. epimers
  2. anomers
  3. enantiomers
  4. diastereomers
Ques. 5AIPMT 2000

Which one is responsible for production of energy in bio-reaction?

  1. Thyroxine
  2. Adrenaline
  3. Oestrogen
  4. Progesterone
Ques. 6AIPMT 2000

How do enzymes increase the rate of reactions?

  1. by lowering activation energy
  2. by increasing activation energy
  3. by changing equilibrium constant
  4. by forming enzyme substrate complex.

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