Biomolecules

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Question
CBSEENCH12010747

Biuret test is not given by 

  • proteins

  • carbohydrates

  • polypeptides

  • urea

Solution

B.

carbohydrates

Biuret test is given by the compounds having peptide bond which is not present in carbohydrate.  Biuret Test produces violet colour on addition of dilute  CuSO4 to an alkaline solution of a compound containing peptide linkage.

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Question
CBSEENCH12010913

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at

  • straight C subscript 5 superscript straight l space and space straight C subscript 2 superscript straight l respectively of the sugar molecule
  • straight C subscript 2 superscript straight l space and space straight C subscript 5 superscript straight l respectively of the sugar molecule
  • straight C subscript 1 superscript straight l space and space straight C subscript 5 superscript straight l
  • straight C subscript 5 superscript straight l space and space straight C subscript 1 superscript straight l respectively of the sugar molecule

Solution

C.

straight C subscript 1 superscript straight l space and space straight C subscript 5 superscript straight l WiredFaculty

Question
CBSEENCH12010981

Insulin production and its action in the human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

  • A co- enzyme

  • An antibiotic

  • A hormone

  • An enzyme

Solution

C.

A hormone

Insulin is a hormone built up of two polypeptide chains.

Question
CBSEENCH12010684

Synthesis of each molecule of glucose in photosynthesis involves

  • 18 molecules of ATP

  • 10 molecules of ATP

  • 8 molecules of ATP

  • 6 molecules of ATP

Solution

A.

18 molecules of ATP

6CO2 + 12NADP.2H + 18 ATP → C6H12O6 + 18 P +12NADP +18 ADP

Question
CBSEENCH12010619

The absolute configuration of
WiredFaculty
is:

  • (2S, 3R)

  • (2S, 3S)

  • (2R, 3R)

  • (2R, 3S)

Solution

A.

(2S, 3R)

WiredFaculty
For C-2 order of priority of substituents is 
OH> CH(Cl)(CH3)>COOH

For C-3, order of priority of substituents is 
Cl> CH(OH)COOH > CH3

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