Biomolecules Test

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Biomolecules Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

Starch is polymer of

A
fructose

B
Glucose

C
both (a) and (b)

D
none of these

Solution

$$\text{Starch is a polymer of glucose.}$$ It is formed by the attachment of glucose units by glycosidic bonds. The basic formula of starch is ($$C_6H_{10}O_5)_n$$. It exists in two forms $$amylose$$ and $$amylopectin.$$ Amylose is formed by a linkage of glucose by alpha $$1,4$$ glucose unit. It is a linear polymer. Amylopectin is a branched polymer of glucose where two polymeric chains of glucose of alpha 1,4 glucose unit are linked by alpha 1,6 linkage.
So, the correct answer is option B.
Question 2
1 / -0

Which of the following carbohydrates most abundant in nature

A
Glucose

B
Fructose

C
Starch

D
Cellulose

Solution

$$\text{Cellulose is most abundant in nature.}$$ Cellulose, a complex carbohydrate or polysaccharide consisting of 3,000 or more glucose units. Being the basic structural component of plant cell walls, cellulose comprises about 33 percent of all vegetable matter (90 percent of cotton and 50 percent of wood are cellulose) and is the most abundant of all naturally occurring organic compounds.

Option D is correct.
Question 3
1 / -0

Which among the following is the monomer of starch?

A
Glucose

B
Sucrose

C
Fructose

D
Lactose

Solution

$$\text{glucose monomers}$$
Starch is a polysaccharide comprising glucose monomers joined in $$α\ 1,4 -linkages.$$ The simplest form of starch is the linear polymer amylose; amylopectin is the branched form.

Option A is correct.
Question 4
1 / -0

A carbohydrates consists of:

A
carbon and oxygen

B
carbon, hydrogen and oxygen

C
carbon, hydrogen and nitrogen

D
carbon and hydrogen

Solution

$$\text{carbohydrate is a biological molecule consisting of carbon, hydrogen, and oxygen atoms,}$$ usually with a hydrogen-oxygen atom ratio of 2:1 (as in water). The term is common in biochemistry, where it is a synonym of saccharide, a group that includes, and cellulose.
Question 5
1 / -0

Which sugar does not increases the calorific value?

A
Sucrose

B
Glucose

C
Aspartame

D
Fructose

Solution

Aspartame is artificial sugar so it does not increases the calorie intake it only induces the sweetness.

Option C is correct.
Question 6
1 / -0

Sucrose on hydolysis gives

A
glucose only

B
glucose and galactose

C
glucose and fructose

D
glucose and lactose

Solution

Sucrose is composed of one mole of $$\text{α D -glucose and β D fructose, connected by glycosidic linkage at 1 and 4}$$$$\text{ carbon atoms of glucose and fructose respectively.}$$

$$\text{When sucrose is hydrolyzed by an enzyme, a mixture of glucose and fructose is obtained.}$$

Option C is correct.
Question 7
1 / -0

starch undergose hydrolysis is presence of mineral acids to

A
glucose

B
fructose

C
maltose

D
sucrose

Solution

Starch undergoes hydrolysis in the presence of mineral acids to form glucose.

$$\underset{starch\ or\ cellulose}{(C_6H_{12}O_5)_n}+\ nH_2O\xrightarrow[293K,2-3 bar]{H^+}\underset{glucose}{nC_6H_{12}O_6}$$

Option A is correct.
Question 8
1 / -0

Which of the following monosaccharide is pentose?

A
Glucose

B
Fructose

C
Arabinose

D
mannose

Solution

Arabinose is pentose monosaccharide while glucose, fructose and galactose are hexose sugar.

Option C is correct.
Question 9
1 / -0

Rice does not contain:

A
alanine

B
glycine

C
gluten

D
leucine

Solution

Rice does not contain gluten, which makes it and rice based products a good choice for those with celiac disease.
Question 10
1 / -0

In a chemical test, a biomolecule gives purple ring on treatment with a-naphthol and conc. $$H_{2}SO_{4}$$, The chemical test and biomolecule respectively are:

A
molisch test, protein

B
molisch test, carbohydrate

C
ninhydrin test, carbohydrate

D
ninhydrin test, protein

Solution

All carbohydrates (monosaccharides, disaccharides and polysaccharides) give a positive reaction for Molisch test. It is based on the dehydration of the carbohydrate by Sulphuric acid to produce an aldehyde, which condenses with two molecules of α-naphthol, resulting in appearance of a purple ring at the interface.

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Biomolecules Test - 67

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Biomolecules Test - 67

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Question 1

fructose

Glucose

both (a) and (b)

none of these

Solution

Question 2

Glucose

Fructose

Starch

Cellulose

Solution

Question 3

Glucose

Sucrose

Fructose

Lactose

Solution

Question 4

carbon and oxygen

carbon, hydrogen and oxygen

carbon, hydrogen and nitrogen

carbon and hydrogen

Solution

Question 5

Sucrose

Glucose

Aspartame

Fructose

Solution

Question 6

glucose only

glucose and galactose

glucose and fructose

glucose and lactose

Solution

Question 7

glucose

fructose

maltose

sucrose

Solution

Question 8

Glucose

Fructose

Arabinose

mannose

Solution

Question 9

alanine

glycine

gluten

leucine

Solution

Question 10

molisch test, protein

molisch test, carbohydrate

ninhydrin test, carbohydrate

ninhydrin test, protein

Solution

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