Question

which of the following statements best describes the eukaryotic chromosome?

it is composed of dna alone.

the nucleosome is its most basic functional subunit.

the number of genes on each chromosome is different in different cell types of an organism.

it consists of a single linear molecule of double - stranded dna plus proteins.

Explanation:

• Eukaryotic chromosomes are not composed of DNA alone. They have associated proteins.
• The nucleosome is a structural subunit, not the most basic functional subunit in the context of describing the chromosome as a whole.
• The number of genes on a chromosome is generally the same in different cell types of an organism (except for some rare cases like immune - cell gene rearrangements which are not the general case).
• Eukaryotic chromosomes consist of a single linear double - stranded DNA molecule associated with proteins (histones and non - histone proteins).

Answer:

It consists of a single linear molecule of double - stranded DNA plus proteins.