Question

A tree of life depicting the hypothetical phylogeny of the three domains is shown above. A star is placed at the common ancestor of all eukaryotes. Which characteristic would a common ancestor located at the star contain?

(See picture)

CHOICES: A- linear chromosomes with introns
B- circular chromosomes with introns
C- linear chromosomes lacking introns
D- circular chromosomes lacking introns

Answer 1

Answer: A

Explanation: linear chromosomes with introns

Answer 2

Answer: C. Linear chromosomes lacking introns

Explanation: Eukaryotes have linear chromosomes. After cellular replication, introns are spliced in eukaryotes and only keep the exons. This process also includes a 5’ cap and a poly-A tail.