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Biomolecules · Question 17

NEET 2018MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following compounds can form a zwitter ion?

  1. Aniline
  2. Acetanilide
  3. Benzoic acid
  4. Glycine

Answer

(4) Glycine

Solution

A zwitter ion needs both an acidic group and a basic group in the same molecule.

As per NCERT, in aqueous solution the carboxyl group of an amino acid loses a proton and the amino group accepts a proton, giving a dipolar ion (zwitter ion).

Glycine: H2N-CH2-COOH H3 N-CH2-COO

Aniline (only basic), acetanilide (neither) and benzoic acid (only acidic) cannot form a zwitter ion.

Answer: (4)

NEET 2018

Keep practising — Biomolecules

2

Which of the following statements is not correct?

  1. Ovalbumin is a simple food reserve in egg-white.
  2. Blood proteins thrombin and fibrinogen are involved in blood clotting.
  3. Denaturation makes the proteins more active.
  4. Insulin maintains sugar level in the blood of a human body.
NEET 2017
3

The correct statement regarding RNA and DNA, respectively is

  1. The sugar component in RNA is arabinose and the sugar component in DNA is ribose
  2. The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose
  3. The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose
  4. The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.
NEET 2016 (Phase 1)
4

In a protein molecule various amino acids are linked together by

  1. peptide bond
  2. dative bond
  3. -glycosidic bond
  4. -glycosidic bond.
NEET 2016 (Phase 1)
5

Which one given below is a non-reducing sugar?

  1. Glucose
  2. Sucrose
  3. Maltose
  4. Lactose
NEET 2016 (Phase 1)
6

The central dogma of molecular genetics states that the genetic information flows from

  1. Amino acids Proteins DNA
  2. DNA Carbohydrates Proteins
  3. DNA RNA Proteins
  4. DNA RNA Carbohydrates
NEET 2016 (Phase 2)
7

The correct corresponding order of names of four aldoses with configuration given below [figure] respectively, is

  1. L-erythrose, L-threose, L-erythrose, D-threose
  2. D-threose, D-erythrose, L-threose, L-erythrose
  3. L-erythrose, L-threose, D-erythrose, D-threose
  4. D-erythrose, D-threose, L-erythrose, L-threose
NEET 2016 (Phase 2)
8

Which of the following hormones is produced under the condition of stress which stimulate glycogenolysis in the liver of human beings?

  1. Thyroxine
  2. Insulin
  3. Adrenaline
  4. Estradiol
AIPMT 2014
9

D(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2014
10

In DNA, the linkages between different nitrogenous bases are

  1. phosphate linkage
  2. H-bonding
  3. glycosidic linkage
  4. peptide linkage
NEET 2013 (Karnataka)
11

Deficiency of vitamin B1 causes the disease

  1. convulsions
  2. beri-beri
  3. cheilosis
  4. sterility
AIPMT 2012 (Prelims)

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