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Biomolecules

AIPMT 2004MCQMedium📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2004

Which of the following structures represents the peptide chain?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(3) [figure]

Solution

Proteins are polymers of -amino acids, H2N-CH(R)-COOH, joined by peptide (amide) linkages -CO-NH-.

A peptide chain is therefore the repeating unit -NH-CH(R)-CO-, in which every N is followed by one -carbon and then a >C=O group bonded to the next N.

Structure (3) is -NH-C-CO-NH-C-CO-NH-C-CO-, which is exactly this pattern.

The others do not fit, because (1) has -NH-CO-NH- (urea-type) links, (2) has only one amide link followed by a chain of carbons, and (4) has two carbons between N and C=O (not -amino acid units).

Answer: (3)

Keep practising — Biomolecules

Ques. 2AIPMT 2004

The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called

  1. maltase
  2. lipase
  3. zymase
  4. pepsin
Out of syllabus
Ques. 3AIPMT 2003

Glycolysis is

  1. oxidation of glucose to glutamate
  2. conversion of pyruvate to citrate
  3. oxidation of glucose to pyruvate
  4. conversion of glucose to haem
Ques. 4AIPMT 2003

Phospholipids are esters of glycerol with

  1. three carboxylic acid residues
  2. two carboxylic acid residues and one phosphate group
  3. one carboxylic acid residue and two phosphate groups
  4. three phosphate groups
Ques. 5AIPMT 2003

Chargaff's rule states that in an organism

  1. amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
  2. amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
  3. amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
  4. amounts of all bases are equal
Ques. 6AIPMT 2002

Enzymes are made up of

  1. edible proteins
  2. proteins with specific structure
  3. nitrogen containing carbohydrates
  4. carbohydrates
Ques. 7AIPMT 2002

Which is not a true statement?

  1. -carbon of -amino acid is asymmetric
  2. All proteins are found in L-form
  3. Human body can synthesise all proteins it needs
  4. At pH = 7, both amino and carboxylic groups exist in ionised form
Ques. 8AIPMT 2002

Cellulose is polymer of

  1. glucose
  2. fructose
  3. ribose
  4. sucrose
Out of syllabus
Ques. 9AIPMT 2001

Which of the following give positive Fehling solution test?

  1. Sucrose
  2. Glucose
  3. Fats
  4. Protein
Ques. 10AIPMT 2001

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
Ques. 11AIPMT 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.

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