Which of the following is true about chromosomes?

Question

a. have numbers that increase with evolution; primitive organisms have few, advanced have many.

b. consist of coiled and condensed chromatin.

c. occur in full haploid pairs (2n) or single diploid strands (n).

d. consist of RNA.

e. are duplicated during mitosis.

Answer 1

b. consist of coiled and condensed chromatin.

Answer 2

b. consist of coiled and condensed chromatin.

Chromatin is basically a lot of DNA wrapped up.  It's always present in the cell's nucleus (assuming it's a eukaryotic cell), but during mitosis (and/or meiosis), it thickens and condenses into chromosomes, which then proceed to divide and the cell replicates.