Question

The sequence of amino acids in haemoglobin molecules of humans is more similar to that of chimpanzees than it is to the haemoglobin of cats. This similarity suggests that

• A. humans and cats are more closely related than humans and chimpanzees
• B. humans and chimpanzees are more closely related than humans and cats
• C. humans and chimpanzees share 100 percent of their DNA
• D. Both b and c

Answer 1

The correct option is B humans and chimpanzees are more closely related than humans and cats

Molecular homology is the similarity amongst organisms at the molecular level due to shared ancestry. How closely two organisms are related can be determined by the degree of similarity between the base sequence in their nucleic acids. Additionally, similarity of amino acid sequences in their proteins also help to determine the degree of relatedness. The sequence of amino acids in the haemoglobin molecule is very similar in chimpanzees and humans. This indicates that humans and chimpanzees are more closely related than humans and cats.
There is certainly genetic similarity between humans and chimpanzees but it isn't 100 percent.