3. Chromosomes are made up of:

The correct option is C

DNA and protein

The correct option is : (c)

Explanation of the correct option :

1. Chromosomes are the thin thread like structures which are made up of DNA and packed with the help of proteins.
2. Chromosomes are present in the nucleus of an eukaryotic cell and carry the hereditary information for carrying out all the metabolic activities of the cell.

Explanation of the incorrect options:

Option (a) DNA is a part of chromosomes but proteins also occur along with them so this option is incorrect.

Option (b) Proteins are a part of chromosomes and DNA also occur along with them so this option is incorrect.

Option (d) RNA is not a part of chromosomes .

Final answer :

Chromosomes are made up of DNA and proteins.