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Biomolecules · Question 13

NEET (UG) 2020MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following is a basic amino acid?

  1. Alanine
  2. Tyrosine
  3. Lysine
  4. Serine

Answer

(3) Lysine

Solution

As per NCERT, an amino acid having more amino groups than carboxyl groups is basic.

Lysine: H2N-(CH2)4-CH(NH2)-COOH ⇒ two -NH2 groups and one -COOH group ⇒ basic.

Alanine (R = -CH3), tyrosine (R = -CH2-C6H4-OH) and serine (R = -CH2OH) have one amino and one carboxyl group ⇒ neutral.

Answer: (3)

NEET (UG) 2020

Keep practising — Biomolecules

2

Sucrose on hydrolysis gives :

  1. -D-Glucose + -D-Glucose
  2. -D-Glucose + -D-Fructose
  3. -D-Fructose + -D-Fructose
  4. -D-Glucose + -D-Fructose
NEET (UG) 2020
3

The non-essential amino acid among the following is :

  1. alanine
  2. lysine
  3. valine
  4. leucine
NEET (UG) 2019
4

The difference between amylose and amylopectin is

  1. amylopectin have 1 4 -linkage and 1 6 -linkage
  2. amylose have 1 4 -linkage and 1 6 -linkage
  3. amylopectin have 1 4 -linkage and 1 6 -linkage
  4. amylose is made up of glucose and galactose
NEET 2018
5

Which of the following compounds can form a zwitter ion?

  1. Aniline
  2. Acetanilide
  3. Benzoic acid
  4. Glycine
NEET 2018
6

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
7

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)
8

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)
9

Which one given below is a non-reducing sugar?

  1. Glucose
  2. Sucrose
  3. Maltose
  4. Lactose
NEET 2016 (Phase 1)
10

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)
11

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)

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