The right options are; (A) are tight coils of DNA, (D) can be analyzed in a karyotype and (E) carry thousands of genes. Chromosomes are thread-like structures located in the nucleus of most living cells. Chromosomes are composed of DNA (deoxyribonucleic acid), which contains an organism's genetic information in the form of genes that is passed down from parents, histone protein and other structural proteins. DNA is coiled around the histone proteins which give it structural support. During cell division, chromosomes assist in the proper replication and distribution of DNA.
