Question

Match the items given in column A with most appropriate one in column B. Rewrite the correct matching pairs.

Column 1	Column 2
Column A	Column B
Nitrogen base	Nucleosome
Waldeyer	Inheritance
DNA and histone	Chromatin
Gene	Cytosine
Nucleus	Chromosome

Answer 1

1. Nitrogen base d. Cytosine

1. There are four nitrogen bases found in a DNA - adenine, guanine, cytosine, thymine.
2. Adenine is complementary to guanine and forms two hydrogen bonds.
3. Similarly, cytosine is complementary to thymine and forms three hydrogen bonds.

2. Waldeyer e. Chromosome

1. Waldeyer - Hartz was a German anatomist who discovered chromosomes in the year 1888.
2. Chromosome are thread-like structure found in the nucleus which contains genetic material.
3. It is made up of DNA and proteins and is organized into genes.

3. DNA and histone a. Nucleosome

1. Chromatin is made up of 40% DNA and 60% histone proteins.
2. The DNA wraps around the core histone proteins to form a complex called the nucleosome.

4. Gene b. Inheritance

1. Gene is a region of the DNA that expresses a particular character.
2. So, the gene is associated with inheritance.
3. Inheritance is the phenomenon by which the genetic information contained in the gene is passed on from one generation to the next generation.
4. Parents pass on their traits to their offspring by inheritance.

5. Nucleus c. Chromatin

1. Nucleus contains the hereditary material called the chromatin.
2. During cell division, the chromatin condenses to form the duplicated chromosome during prophase stage.

Column A	Column B
1. Nitrogen base	d. Cytosine
2. Waldeyer	e. Chromosome
3. DNA and histone	a. Nucleosome
4. Gene	b. Inheritance
5. Nucleus	c. Chromatin