Test: Biomolecules- 3


30 Questions MCQ Test Organic Chemistry | Test: Biomolecules- 3


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QUESTION: 1

The number of amino acids and number of peptides bonds in a linear tetrapeptide (made of different amino acids) are respectively:

Solution:
QUESTION: 2

The aqueous solut ion of a carbohydrate gave dark blue colour with iodine solution. The carbohydrate is:

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QUESTION: 3

In the reactions, 

The major product X and Y respectively, are:

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QUESTION: 4

Ident ify the correct set of stereochemical relat ionships amongst the following monosaccharides I-IV:


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QUESTION: 5

In a double stranded DNA, if the sequence 5’AGATCC3’ appears on one strand of DNA, what sequence appears on the complementary strand?

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QUESTION: 6

Which one of the following compounds will form an osazone derivative:

Solution:

When sugars are reacted with excess of phenylhydrazine osazone formation takes place.Osazone will form in that sugar only where keto hydroxy group is present.

Thus CH3CH2COCH2OH will form an osazone derivative; as it has keto hydroxy group.

QUESTION: 7

An acidic amino acid among the following is:

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QUESTION: 8

Ribose and 2-deoxyribose can be different iated by:

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QUESTION: 9

The number of disulphide linkage present in insulin are:

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QUESTION: 10

Which one of the following is an essential amino acid:

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QUESTION: 11

The pKa values for the three ionizable groups X, Y and Z or Glutamic acid are 4.3, 9.7 and 2.2 respectively:

The isoelectric point for the amino acid is:  

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QUESTION: 12

The reagent ‘oxine’ commonly used in analytical chemistry is:

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QUESTION: 13

The structure of D-(+)-glucose is:

The structure of L-(–)-glucose is:

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QUESTION: 14

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution:

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QUESTION: 15

The complementary DNA sequence of the given DNA 5' - G - A - A - T - T - C - 3' is:

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QUESTION: 16

α-Farnesene shown below is a 

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QUESTION: 17

The correct relationship within each pair of the natural product is

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QUESTION: 18

Which one among the following is a Sesquiterpene:

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QUESTION: 19

The compound given below is a: 

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QUESTION: 20

One sequence of amino acids respects for long distances in silk protein. Complete hydrolysis of one mole of a fragment with this sequence gives 2 mol alanine, 3 mol glycine, and 1 mol serine. Partial hydrolysis yields Ala-Gly-Ala, Gly-Ala-Gly, Gly-Ser-Gly, and Ser-Gly-Ala peptides. What is the amino acid repeat:

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QUESTION: 21

Tyrosine, at pH 12, has the following structure:

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QUESTION: 22

A disaccharide does not give a posit ive test for Tollen’s reagent. Upon acidic hydrolysis, it gives an equimolar mixture of two different monosaccharides, both the which can be oxidized by bromine water. This disaccharide is:

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QUESTION: 23

Match the following compounds with their respective classes

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QUESTION: 24

Predict the products X and Y of the following peptide ligation react ion:

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QUESTION: 25

Which of the following monomers do you expect to find in a RNA molecule:

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QUESTION: 26

In the following react ion, the major products X and Y are:

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QUESTION: 27

Among the following, the incorrect statement(s) is/are:

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QUESTION: 28

All natural amino acids, except one, react with cold nitrous acid and produce nitrogen gas. Which one of the following is that odd amino acid:

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QUESTION: 29

Which one of the following statement is correct:

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QUESTION: 30

The product of the following reaction will be able to couple with which amino acids:

Solution:

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