Molecular Basis of Inheritance Test 4

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Molecular Basis of Inheritance Test 4

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Weekly Quiz Competition

Question 1
1 / -0

Identify the purine base of nucleic acids in the following

A
Cytosine

B
Thymine

C
Uracil

D
Adenine

Solution

Purines have two rings in their structure, but pyrimidine bases have only one ring.Adenine has two rings in its structure.
Question 2
1 / -0

Which of the following are not the components of RNA?

A
Thymine

B
Adenine

C
Guanine

D
Cytosine

Solution

Thymine is present in DNA but not in RNA.
Question 3
1 / -0

Which of the following statements is true?

A
Sugar component of a nucleotide is ribose

B
Sugar component of a nucleotide is deoxyribose

C
The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage

D
The sugar molecule of the nucleotide is in L-configuration

Solution

Sugar component of a nucleotide may be ribose or deoxyribose.
Question 4
1 / -0

What is the composition of nucleoside?

A
a sugar + a phosphate

B
a base + a sugar

C
a base + a phosphate

D
a base + a sugar + phosphate

Solution

A nucleoside is composed of a base and a sugar.
Question 5
1 / -0

What is the composition of nucleotide?

A
a sugar + a phosphate

B
a base + a sugar

C
a base + a phosphate

D
a base + a sugar + phosphate

Solution

A nucleotide is composed of a base, a sugar and a phosphate.
Question 6
1 / -0

Group of adjacent nucleotides are joined by

A
Phosphodiester bond

B
Peptide bond

C
Ionic bond

D
Covalent bond

Solution

In DNA and RNA, the phosphodiester bond is the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another, deoxyribose in DNA and ribose in RNA
Question 7
1 / -0

The sugar molecule in a nucleotide is

A
Pentose

B
Hexose

C
Tetrose

D
Triose

Solution

Ribose or deoxyribose is a 5 carbon sugar.
Question 8
1 / -0

Which of the following is true about phosphodiester linkage?

A
5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide

B
3’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide

C
5’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide

D
3’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide

Solution

5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide.
Question 9
1 / -0

Building blocks of nucleic acids are

A
Nucleotides

B
Nucleosides

C
Amino acids

D
Histones

Solution

Nucleotides are the building blocks of nucleic acids.

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Molecular Basis of Inheritance Test 4

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Molecular Basis of Inheritance Test 4

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Question 1

Cytosine

Thymine

Uracil

Adenine

Solution

Question 2

Thymine

Adenine

Guanine

Cytosine

Solution

Question 3

Sugar component of a nucleotide is ribose

Sugar component of a nucleotide is deoxyribose

The bases in nucleotides are attached to a pentose sugar moiety by a glycosidic linkage

The sugar molecule of the nucleotide is in L-configuration

Solution

Question 4

a sugar + a phosphate

a base + a sugar

a base + a phosphate

a base + a sugar + phosphate

Solution

Question 5

a sugar + a phosphate

a base + a sugar

a base + a phosphate

a base + a sugar + phosphate

Solution

Question 6

Phosphodiester bond

Peptide bond

Ionic bond

Covalent bond

Solution

Question 7

Pentose

Hexose

Tetrose

Triose

Solution

Question 8

5’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide

3’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide

5’-phosphate group of one nucleotide unit is joined to the 5’-hydroxyl group of the next nucleotide

3’-phosphate group of one nucleotide unit is joined to the 3’-hydroxyl group of the next nucleotide

Solution

Question 9

Nucleotides

Nucleosides

Amino acids

Histones

Solution

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