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Biomolecules · Question 25

AIPMT 2014MCQEasy📈 Topic in 25% papers+4−1
1

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

As per NCERT, glucose reacts with hydroxylamine to form an oxime; only the -CHO group (C-1) changes to -CH=NOH:

CHO-(CHOH)4-CH2OH NH2OH HON=CH-(CHOH)4-CH2OH

The configuration at C-2 to C-5 stays the same as in D-glucose (Fischer projection): -OH on the right at C-2, left at C-3, right at C-4 and right at C-5.

⇒ Order from top: H–C–OH, HO–C–H, H–C–OH, H–C–OH, which is structure (4).

Answer: (4)

AIPMT 2014

Keep practising — Biomolecules

2

In DNA, the linkages between different nitrogenous bases are

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

Deficiency of vitamin B1 causes the disease

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

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)
5

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)
6

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)
7

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)
8

Fructose reduces Tollens' reagent due to

  1. asymmetric carbons
  2. primary alcoholic group
  3. secondary alcoholic group
  4. enolisation of fructose followed by conversion to aldehyde by base
AIPMT 2010 (Mains)
9

Which one of the following does not exhibit the phenomenon of mutarotation?

  1. (+) Sucrose
  2. (+) Lactose
  3. (+) Maltose
  4. (−) Fructose
AIPMT 2010 (Prelims)
10

The segment of DNA which acts as the instructional manual for the synthesis of the protein is

  1. ribose
  2. gene
  3. nucleoside
  4. nucleotide
AIPMT 2009
11

Which of the following hormones contains iodine?

  1. Testosterone
  2. Adrenaline
  3. Thyroxine
  4. Insulin
AIPMT 2009

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