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Biomolecules · Question 58

AIPMT 2001MCQEasy📈 Topic in 0% papers+4−1
1

Which of the following give positive Fehling solution test?

  1. Sucrose
  2. Glucose
  3. Fats
  4. Protein

Answer

(2) Glucose

Solution

Fehling solution is reduced (red precipitate of Cu2O) only by reducing sugars, which have a free aldehyde or ketone group.

Glucose has a free –CHO group, so it is a reducing sugar and gives a positive test.

As per NCERT, in sucrose the reducing groups of glucose and fructose are involved in the glycosidic bond, so sucrose is a non-reducing sugar.

Fats and proteins have no free aldehyde group.

Answer: (2)

AIPMT 2001

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2

Which of the following is correct about H-bonding in nucleotide?

  1. A-T, G-C
  2. A-G, T-C
  3. G-T, A-C
  4. A-A, T-T
AIPMT 2001
3

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.
AIPMT 2001
4

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.
AIPMT 2001
5

[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
6

-D-glucose and -D-glucose are

  1. epimers
  2. anomers
  3. enantiomers
  4. diastereomers
AIPMT 2000
7

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

  1. Thyroxine
  2. Adrenaline
  3. Oestrogen
  4. Progesterone
AIPMT 2000
8

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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