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Biomolecules · Question 21

NEET 2016 (Phase 1)MCQEasy📈 Topic in 0% papers+4−1
1

Which one given below is a non-reducing sugar?

  1. Glucose
  2. Sucrose
  3. Maltose
  4. Lactose

Answer

(2) Sucrose

Solution

As per NCERT, sugars with a free aldehydic or ketonic group reduce Fehling's solution and Tollens' reagent (reducing sugars).

Glucose: free aldehyde group ⇒ reducing.

Maltose and lactose: one free hemiacetal (C-1) group ⇒ reducing.

Sucrose: glycosidic linkage between C-1 of α-glucose and C-2 of β-fructose ⇒ both reducing groups are involved ⇒ non-reducing.

Answer: (2)

NEET 2016 (Phase 1)

Keep practising — Biomolecules

2

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)
3

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)
4

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
5

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
6

In DNA, the linkages between different nitrogenous bases are

  1. phosphate linkage
  2. H-bonding
  3. glycosidic linkage
  4. peptide linkage
NEET 2013 (Karnataka)
7

Deficiency of vitamin B1 causes the disease

  1. convulsions
  2. beri-beri
  3. cheilosis
  4. sterility
AIPMT 2012 (Prelims)
8

Which one of the following sets of monosaccharides forms sucrose?

  1. -D-galactopyranose and -D-glucopyranose
  2. -D-glucopyranose and -D-fructofuranose
  3. -D-glucopyranose and -D-fructofuranose
  4. -D-glucopyranose and -D-fructopyranose
AIPMT 2012 (Prelims)
9

Which of the following is not a fat soluble vitamin?

  1. Vitamin B complex
  2. Vitamin D
  3. Vitamin E
  4. Vitamin A
AIPMT 2011 (Mains)
10

Which of the statements about "Denaturation" given below are correct?

  1. B and C
  2. A and C
  3. A and B
  4. A, B and C
AIPMT 2011 (Mains)
11

Which one of the following statements is not true regarding (+) lactose?

  1. On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
  2. (+) Lactose is a -glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
  3. (+) Lactose is a reducing sugar and does not exhibit mutarotation.
  4. (+) Lactose, C12H22O11 contains 8 –OH groups
AIPMT 2011 (Prelims)

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