NEET

Natural glucose is termed D-glucose because :

–OH on the second carbon is on the right side in Fischer projection
–OH on the sixth carbon is on the right side in Fischer projection.
–OH on the fifth carbon is on the right side in Fischer projection.
It is dextrorotatory

Solution

Nucleotide in DNA are linked by –

hydrogen bond
3'-5' phosphodiester bond
glycosidic bond
peptide bond

Solution

Phosphate is linked to 3^rd & 5^th carbon of corresponding sugar.

When α-D-glucose and β-D-glucose are dissolved in water in two separate beakers I and II respectively and allowed to stand, then –

specific rotation in beaker I will decrease while in II will increase upto a constant value
the specific rotation of equilibrium mixture in two beakers will be different
the equilibrium mixture in both beakers will be leavorotatory
the equilibrium mixture in both beakers will contain only cyclic form of glucose

Solution

Glycosidic linkage is actually an :

Carbonyl bond
Ether bond
Ester bond
Amide bond

Solution

Glycosidic linkage is actually an ether bond as the linkage forming the rings in an oligosaccharide or polysaccharide is not just one bond, but the two bonds sharing an oxygen atom e.g. sucrose.

Which of the following is a non-reducing sugar ?

Sucrose
Maltose
Lactose
Fructose

Solution

Sucrose is formed by 1-2 linking of glucose and fructose.Thus both reducing groups are involved in glycosidic linkage.

Energy is stored in our body in the form of

ATP
ADP
Fats
carbohydrates

Solution

Energy is stored in our body in the form of A.T.P.

The base present in DNA, but not in RNA is

guanine
adenine
uracil
thymine

Solution

Thymine is present in DNA while in RNA there is Uracil.

Vitamin A is present in

cod liver oil
carrot
milk
in all of these

Hydrolytic reaction of fats, with caustic soda, is known as

acetylation
carboxylation
saponification
esterification

Solution

\(Oil/fat + Alkali \overset{Saponification}{\rightarrow} Soap + Glycerol\)

Which one of the following is NOT correct?

D(–) Fructose exists in furanose structure
D(+) Glucose exists in pyranose structure
In sucrose the two monosaccharides are held together by peptide linkage
Maltose is a reducing sugar

Solution

In sucrose the two monosaccharides are held together by glycosidic linkage and not by peptide linkage.

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