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Biomolecules · Question 56

AIPMT 2002MCQMedium📈 Topic in 12% papers+4−1
1

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

Answer

(2) All proteins are found in L-form

Solution

As per NCERT, the D/L configuration is assigned to α-amino acids (the monomers), not to proteins; most naturally occurring α-amino acids have the L-configuration, and glycine has no chiral centre at all.

∴ The statement 'All proteins are found in L-form' is not true.

Other statements: the α-carbon of α-amino acids (other than glycine) carries four different groups; the body builds the proteins it needs from amino acids; near pH = 7 amino acids exist as zwitterions ( H3 N-CHR-COO ), with both groups ionised.

Answer: (2)

AIPMT 2002

Keep practising — Biomolecules

2

Cellulose is polymer of

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

Which of the following give positive Fehling solution test?

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

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
5

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
6

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
7

[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
8

-D-glucose and -D-glucose are

  1. epimers
  2. anomers
  3. enantiomers
  4. diastereomers
AIPMT 2000
9

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

  1. Thyroxine
  2. Adrenaline
  3. Oestrogen
  4. Progesterone
AIPMT 2000
10

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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