Biomolecules Test

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Biomolecules Test - 3

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Weekly Quiz Competition

Question 1
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Carbohydrates Which taste sweet are called

A
Saccharides

B
Sugars

C
aldehydes and ketones

D
Saccharides and sugars.

Solution

carbohydrates like monosaccharides (one sugar molecule, example: Glucose) and disaccharides (two sugar molecule,example Sucrose I.e Table sugar) always tastes sweet.
Question 2
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Acetylation of glucose yields

A
p – toluenesulphonyl chloride

B
N Methylbenzamide

C
oxime

D
glucose pentaacetate

Solution

Acetylation of glucose with acetic anhydride gives glucose pentaacetate which confirms the presence of five –OH groups. Since it exists as a stable compound, five –OH groups should be attached to different carbon atoms.
Question 3
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Which of the following substances fall(s) in the category of carbohydrates?

A
Glycogen

B
Insulin

C
Cytosine

D
All of the above
Question 4
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The polymer(s) of dextrose is

A
Maltose

B
Glucose

C
Cellulose and Starch

D
Fructose

Solution

Monosaccharides (such as Glucose/dextrose) are building blocks of disaccharides (such as sucrose and lactose) and polysaccharides (such as Cellulose and Starch).
Question 5
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The chemical name of vitamin C is

A
citric acid

B
acetic acid

C
ascorbic acid

D
oxalic acid
Question 6
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What is the most abundant organic compound on earth?

A
Starch

B
Glucose

C
Cellulose

D
Fructose

Solution

Glucose is probably the most abundant organic compound on earth. It is the monomer of many of the larger carbohydrates, namely starch, cellulose
Question 7
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Which of the following pairs contains a reducing sugar and a non-reducing sugar?

A
Glucose and galactose

B
Maltose and lactose

C
Glucose and sucrose

D
Glucose and maltose
Question 8
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Which of the following substances does not fall in the category of carbohydrates?

A
Sugar

B
Starch

C
Glycerol

D
Cellulose
Question 9
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Which of the following structures represents thymine?

A

B

C

D
Question 10
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Which of the following statements is not correct?

A
A peptide bond is –CO–NH–.

B
Each polypeptide has one C-terminal and one N-terminal.

C
The amino acid sequence of a protein determines the function of the protein.

D
The union of two amino acids produces two peptide linkages.
Question 11
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Which of the following statements is incorrect?

A
The molecules of proteins and enzymes are produced in the cell by nucleic acids.

B
There are two types of nucleic acids, namely DNA and RNA.

C
Nucleic acids are polymers of nucleotides.

D
Deoxyribonucleotide is a polymer of deoxyribonucleic acid.
Question 12
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Which of the following is not a disaccharide?

A
Sucrose

B
Maltose

C
Lactose

D
Dextrose
Question 13
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Sucrose in water is dextrorotatory, [_D] = +66.50. When boiled with dilute HCl, the solution becomes laevorotatory, [_D]= –39.5^o. In this process, the sucrose molecule breaks into

A
L-glucose + D-fructose

B
L-glucose + L-fructose

C
D-glucose + D-fructose

D
D-glucose + L-fructose
Question 14
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The protein molecule present in haemoglobin is

A
thrombin

B
fibrinogen

C
globulin

D
casein

Question 15

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Directions: Match the statements/expressions in Column–I with the statements/expressions in Column–II and indicate your answer by selecting the appropriate option. Any statement in Column–I can correctly match with only one statement in Column–II.

Column–I	Column–II
(A) Peptide linkage (B) Polypeptide (C) Proteins (D) Zwitter ion	(a) Oxytocin (b) Molecular weight > 10,000 (c) –CO^-NH^- (d) Molecules having oppositely charged groups

(A) – (c), (B) – (a), (C) – (b), (D) – (d)

(A) – (d), (B) – (c), (C) – (b), (D) – (a)

(A) – (c), (B) – (d), (C) – (a), (D) – (b)

(A) – (a), (B) – (b), (C) – (c), (D) – (d)

Question 16
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Which of the following enzymes converts starch into maltose?

A
Maltase

B
Diastase

C
Zymase

D
Invertase
Question 17
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Identify the incorrect statement regarding vitamin B₁.

A
It is a fat-soluble vitamin.

B
It is also known as thiamine.

C
Its deficiency causes beriberi.

D
It is a sulphur-containing vitamin.
Question 18
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Denaturation of proteins involves breakdown of

A
primary structure only

B
secondary structure only

C
primary, secondary and tertiary structures

D
secondary, tertiary and quaternary structures
Question 19
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Oxime is formed by treating glucose with

A
Water

B
hydroxylamine

C
nitric acid

D
bromine water

Solution

Glucose reacts with hydroxylamine (NH2OH) to form an oxime. Oxime is formed by combination of carbonyl group of glucose and hydroxyl group of hydroxyl amine.
Question 20
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Which of the following pairs is NOT correctly matched?

A
Retinol : Vitamin A

B
Thiamine : Vitamin B₂

C
Calciferol : Vitamin D

D
Biotin : Vitamin H
Question 21
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Maltose is formed by the union of

A
one molecule of glucose and one molecule of fructose

B
one molecule of glucose and one molecule of galactose

C
two molecules of glucose

D
two molecules of galactose
Question 22
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Sucrose is formed by the union of

A
one molecule of glucose and one molecule of fructose

B
one molecule of glucose and one molecule of galactose

C
two molecules of glucose

D
two molecules of galactose
Question 23
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Directions: The following question has four choices out of which ONLY ONE is correct.

Amino acid having a hydrophilic side chain is

A
valine

B
leucine

C
lysine

D
phenylalanine
Question 24
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Directions: The following question has four choices, out of which ONLY ONE is correct.

Which of the following statements about fructose is not correct?

A
Fructose reacts with five molecules of acetic anhydride to give a penta-acetate.

B
It is oxidised by nitric acid to give a mixture of trihydroxy glutaric, tartaric and glycolic acids.

C
Fructose is not oxidised by bromine water.

D
With excess of phenylhydrazine, it gives an osazone completely different from glucosazone.
Question 25
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Which of the following bases is not common in DNA and RNA?

A
Adenine

B
Guanine

C
Thymine

D
Cytosine

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Biomolecules Test - 3

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Question 1

Saccharides

Sugars

aldehydes and ketones

Saccharides and sugars.

Solution

Question 2

p – toluenesulphonyl chloride

N Methylbenzamide

oxime

glucose pentaacetate

Solution

Question 3

Glycogen

Insulin

Cytosine

All of the above

Question 4

Maltose

Glucose

Cellulose and Starch

Fructose

Solution

Question 5

citric acid

acetic acid

ascorbic acid

oxalic acid

Question 6

Starch

Glucose

Cellulose

Fructose

Solution

Question 7

Glucose and galactose

Maltose and lactose

Glucose and sucrose

Glucose and maltose

Question 8

Sugar

Starch

Glycerol

Cellulose

Question 9

Question 10

A peptide bond is –CO–NH–.

Each polypeptide has one C-terminal and one N-terminal.

The amino acid sequence of a protein determines the function of the protein.

The union of two amino acids produces two peptide linkages.

Question 11

The molecules of proteins and enzymes are produced in the cell by nucleic acids.

There are two types of nucleic acids, namely DNA and RNA.

Nucleic acids are polymers of nucleotides.

Deoxyribonucleotide is a polymer of deoxyribonucleic acid.

Question 12

Sucrose

Maltose

Lactose

Dextrose

Question 13

L-glucose + D-fructose

L-glucose + L-fructose

D-glucose + D-fructose

D-glucose + L-fructose

Question 14

thrombin

fibrinogen

globulin

casein

Question 15

(A) – (c), (B) – (a), (C) – (b), (D) – (d)

Thiamine : Vitamin B₂