Biomolecules

Question 1

the carbohydrates may be defined as

Answer 1

optically active polyhydroxy aldehydes or ketones or the compounds
which produce such units on hydrolysis

Question 2

Monosaccharides:

Answer 2

A carbohydrate that cannot be hydrolysed further
to give simpler unit of polyhydroxy aldehyde or ketone is called a
monosaccharide.

Question 3

Oligosaccharides:

Answer 3

Carbohydrates that yield two to ten

monosaccharide units, on hydrolysis, are called oligosaccharides

Question 4

How many monosaccharides are known

Answer 4

20

Question 5

Pyran

Answer 5

Pyran is a cyclic organic compound with one oxygen atom

and five carbon atoms in the ring.

Question 6

The cyclic structure of glucose is

more correctly represented by ? structure as given below.

Answer 6

Haworth

Question 7

Fructose is an important

Answer 7

ketohexose

Question 8

It is obtained along with glucose

by

Answer 8

the hydrolysis of disaccharide, sucrose.

Question 9

It is a natural

monosaccharide found in

Answer 9

fruits, honey and vegetables.

Question 10

In its pure

form it is used as a

Answer 10

sweatener

Question 11

It

belongs to ?-series and is a ?rotatory compound.

Answer 11

d and laevo

Question 12

fructose is appropiately written as

Answer 12

d -(-)fructose

Question 13

The ring, thus formed
is a five membered ring and is named as ? with analogy to the
compound furan

Answer 13

furanose

Question 14

furan

Answer 14

Furan is a five membered cyclic compound with one

oxygen and four carbon atoms.

Question 15

glycosidic linkage

Answer 15

The two monosaccharides are joined together by an
oxide linkage formed by the loss of a water molecule. Such a linkage
between two monosaccharide units through oxygen atom is called
glycosidic linkage.

Question 16

define ketonic group with the reference to bonding.

Answer 16

In disaccharides, if the reducing groups of monosaccharides i.e.,
aldehydic or ketonic groups are bonded, these are non-reducing sugars,
e.g., sucrose.