A protein known as RecA helps repair damaged DNA. All types of organisms
make this protein, but the
versions in different organisms may have different
amino acid sequences. A
segment of the amino acid sequence is shown for
four species:
Moss:
LIK GLS DAK
Nematode:
Plasmodium:
Zebrafish:
NVK GIS DQK
AIK GIS EQK
NIK GIS EAK
Based on these sequences, which two organisms have the most recent
common ancestor?
A. Zebrafish
☐ B. Plasmodium
C. Moss
D. Nematode
