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Biomolecules · Question 53

AIPMT 2003MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(2) two carboxylic acid residues and one phosphate group

Solution

In a phospholipid (e.g. lecithin) two –OH groups of glycerol are esterified with fatty acids and the third –OH with phosphoric acid (often further linked to a base such as choline).

two carboxylic acid residues + one phosphate group

(Three carboxylic acid residues triglyceride, i.e. fat / oil.)

Answer: (2)

AIPMT 2003

Keep practising — Biomolecules

2

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
AIPMT 2003
3

Enzymes are made up of

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

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
AIPMT 2002
5

Cellulose is polymer of

  1. glucose
  2. fructose
  3. ribose
  4. sucrose
Out of syllabusAIPMT 2002
6

Which of the following give positive Fehling solution test?

  1. Sucrose
  2. Glucose
  3. Fats
  4. Protein
AIPMT 2001
7

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
8

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
9

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
10

[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
11

-D-glucose and -D-glucose are

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

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