Chromosomes are made up of
(a) DNA
(b) protein
(c) DNA and protein
(d) RNA.

AcademicBiologyNCERTClass 9

Correct Answer: (c) DNA and protein


 Chromosomes are thread-like structures made up of protein and a single molecule of deoxyribonucleic acid (DNA). These are located inside the nucleus of animal and plant cells.

The structure of chromosomes keeps DNA tightly wrapped around spool-like proteins called histones. Humans have 23 pairs of chromosomes, for a total of 46 chromosomes.

Chromosomes are composed of DNA, histones, and RNA. Genes are not visible and chromosomes are visible under the microscope. A single chromosome comprises many genes. It contains and preserves information in the form of a sequence of DNA for producing proteins.

Updated on 10-Oct-2022 13:28:28