Biomolecules Test

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Biomolecules Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

Match the following.
SET A SET B
Name of hormone Functional group in hormones
1) Testosterone a) double bond
2) Estradiol b) Ketone
3) Progesterone c) Alcohols
4) Ethylene d) Alcohol and ketone

A
1 - d; 2 - c; 3 - b; 4 - a

B
1 - a; 2 - b; 3 - c; 4 - d

C
1 - c; 2 - d; 3 - a; 4 - b

D
1 - b; 2 - c; 3 - d; 4 - a

Solution

Testosterone contains alpha beta unsaturated carbonyl group and a secondary OH group.
Estradiol contains a phenolic OH group and a secondary alcohol.
Progesterone contains alpha beta unsaturated carbonyl group and carbonyl group.
Ethylene contains a carbon carbon double bond.
Question 2
1 / -0

___________ are the chemical messengers that are used by multicellular organisms for control and coordination.

A
Vitamins

B
Minerals

C
Antibiotics

D
Hormones

Solution

Hormones are the chemical messengers that are produced by the endocrine system (composed of glands) but are transported to different parts of the body through the bloodstream.
Hormones play an important role in the control and coordination of the body. For example, the growth of an individual is regulated by growth hormones secreted by the pituitary gland.
Question 3
1 / -0

A disaccharide, on hydrolysis, gives:

A
two molecules of the same monosaccharide

B
one molecule each of the same monosaccharide

C
three molecules of the same monosaccharide

D
two molecules of the same or one molecule each of two different monosaccharides

Solution

A disaccharide on hydrolysis gives two molecules of the same or one molecule each of two different monosaccharides since a disaccharide is defined as the sugar formed by the glycosidic linkage of 2 monosaccharides. Consider, for example, maltose. It hydrolyses to give 2 molecules of glucose.
Question 4
1 / -0

Which of the following statement(s) is/are correct?
I. Natural starch contains 10-20 % amylopectin and 90-80 % amylose.
II. Amylose is insoluble in water.
III. Amylopectin is soluble in water.
IV. Starch is white amorphous powder found in roots and seeds of plants.

A
IV only

B
II only

C
II and III

D
I and IV

Solution

Option (D) is correct.
I. Natural starch contains 10-20 % amylose and 90-80 % amylopectin.
II. Amylose is soluble in water. It is also soluble in hot water but does not forms a starch gel or paste.
III. Amylopectin is insoluble in water.
IV. Starch is white amorphous powder found in form of granules in seeds of plants.
Question 5
1 / -0

Which of the following $$\alpha$$-amino acids does not contain a chiral carbon?

A
Glycine

B
Alanine

C
Phenylalanine

D
Valine

Solution

Glycine does not contain a chiral carbon.
As two H atoms are attached to the tetrahedral carbon atom. Hence, it is achiral.
Question 6
1 / -0

Consider the given statements.
I. Dextrin and glycogen are polysaccharides
II. Lactose and glucose are disaccharides
III.Sucrose and maltose are disaccharides
IV. Raffinose is oligosaccharide
The incorrect statements is/are:

A
only II

B
I and II

C
I, II and III

D
IV only

Solution

Option (A) is right. The incorrect statement is (II).
(II) Lactose is a disaccharide while glucose is an aldosic monosaccharide.
Question 7
1 / -0

Consider the given statements about polysaccharides.
I. These are amorphous solids
II. These are insoluble in water
III. These are sugars
The incorrect statements is/are:

A
only III

B
II and III

C
I and III

D
All

Solution

Polysaccharides are amorphous, tasteless and insoluble in water. Sugar mainly contains monosaccharides and some disaccharides. Polysaccharides are not sugars. Thus, only statement III is incorrect.
Question 8
1 / -0

Which of the following is a naphthaquinone derivative?

A
Vitamin K

B
Vitamin D

C
Vitamin A

D
Vitamin B

5

Solution

Vitamin K is a naphthaquinone derivative. It contains isoprene units.
It is also called as "anti-haemorrhagic" vitamin.
Question 9
1 / -0

Which of the following is incorrect about polysaccharides?
I. These are amorphous solids.
II. These are sparingly soluble in water.
III. These are sugars.

A
Only III

B
II and III

C
I and III

D
All of the above

Solution

Polysaccharides are amorphous, tasteless and insoluble in water.

They are non sugars.

Thus only statement III is incorrect.
Question 10
1 / -0

Which of the following statement(s) is/are correct?
I. Starch is almost insoluble in cold water but relatively more soluble in boiling water.
II. Starch solution gives blue colour with $$I_2$$ solution in cold.
III. Starch is a reducing sugar.
IV. Starch forms osazone.

A
III and IV

B
I and II

C
II and III

D
I and IV

Solution

I. Starch is a polysaccharide. It is almost insoluble in cold water but relatively more soluble in boiling water.
Thus, statement I is correct.
II. Starch solution gives blue colour with $$I_2$$ solution in cold. Amylose, a component of starch, gives this blue colour with iodine.
Thus statement II is correct.
III. Starch is non-reducing sugar as the aldehyde group is not free.
Hence, statement III is incorrect.
IV. Starch cannot form osazone as the aldehyde group is not free.
Hence, statement IV is incorrect.

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Biomolecules Test - 39

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Biomolecules Test - 39

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Question 1

1 - d; 2 - c; 3 - b; 4 - a

1 - a; 2 - b; 3 - c; 4 - d

1 - c; 2 - d; 3 - a; 4 - b

1 - b; 2 - c; 3 - d; 4 - a

Solution

Question 2

Vitamins

Minerals

Antibiotics

Hormones

Solution

Question 3

two molecules of the same monosaccharide

one molecule each of the same monosaccharide

three molecules of the same monosaccharide

two molecules of the same or one molecule each of two different monosaccharides

Solution

Question 4

IV only

II only

II and III

I and IV

Solution

Question 5

Glycine

Alanine

Phenylalanine

Valine

Solution

Question 6

only II

I and II

I, II and III

IV only

Solution

Question 7

only III

II and III

I and III

All

Solution

Question 8

Vitamin K

Vitamin D

Vitamin A

Vitamin B5

Solution

Question 9

Only III

II and III

I and III

All of the above

Solution

Question 10

III and IV

I and II

II and III

I and IV

Solution

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Vitamin B

5