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Biomolecules · Question 61

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

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.

Answer

(1) Starch is a polymer of -glucose.

Solution

(1) Correct: as per NCERT, starch is a polymer of -glucose (amylose and amylopectin).

(2) Incorrect: amylose is a component of starch; cellulose is a straight-chain polymer of -glucose.

(3) Incorrect: proteins are polymers of many different -amino acids joined by peptide bonds.

(4) Incorrect: cyclic fructose (furanose form) has a five-membered ring of four carbons and one oxygen, but the cyclic structure as a whole contains six carbon atoms (C-1 and C-6 are outside the ring as -CH2OH groups).

Answer: (1)

AIPMT 2001

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2

[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.
AIPMT 2001
3

-D-glucose and -D-glucose are

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

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

  1. Thyroxine
  2. Adrenaline
  3. Oestrogen
  4. Progesterone
AIPMT 2000
5

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.
AIPMT 2000

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