541.

Which of the following aldoses gives an optically active compound upon reaction with warm dilute nitric acid ?

• 

• 

• 

• 

In the $\mathrm{\alpha }$-helix , the hydrogen bonds

• are roughly parallel to the axis of the helix

• are roughly perpendicular to the axis of the helix

• occur mainly between electronegative atoms of the R groups

• occur only between some of the amino acids of the helix

Glucose $\stackrel{\mathrm{HCN}}{\to } \stackrel{\mathrm{Hydrolysis}}{\to } \stackrel{\mathrm{HI}, \mathrm{heat}}{\to }$ A,

A is

• heptanoic acid

• 2-iodohexane

• heptane

• heptanol

Maltose is made of the units

•  $\mathrm{\alpha }$-D glucose and $\mathrm{\beta }$-D glucose

•  $\mathrm{\alpha }$-D glucose and $\mathrm{\beta }$-D fructose

• $\mathrm{\alpha }$-D glucose and $\mathrm{\beta }$-D glucose

• $\mathrm{\alpha }$-D glucose and $\mathrm{\beta }$-D galactose.

Lysine is least soluble in water in the pH range

• 3 to 4

• 5 to 6

• 6 to 7 

• 9 to 10

Thymine is

• 5-methyluracil

• 4-methyluracil

• 3-methyluracil

• 1-methyluracil

Which one of the following is an example for homogeneous catalysis?

• Manufacture of ammonia by Haber's process.

• Manufacture of sulphuric acid by contact process.

• Hydrogenation of oil.

• Hydrolysis of sucrose in presence of dilute hydrochloric acid.

'Tocopherol' is the chemical name of

• vitamin K

• vitamin E

• vitamin H

• vitamin D

Assertion: Insulin is water soluble.

Reason: Insulin is a globular protein.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false

Assertion : Solubility of proteins is minimum at the isoelectric point.

Reason : At isoelectric point, protein molecule behaves as a zwitter ion.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.