Which statement about the globin genes is true?
A) They are all continually expressed in humans.
B) The globin genes first arose in invertebrates.
C) Different tissues in mammals will express different globin genes.
D) All the different globin genes carry out the exact same function in humans.
E) All forms of human globins bind oxygen with the same affinity.

Question

Quizplus · Accepted Answer

Different tissues in mammals will express different globin genes, allowing for specialized oxygen binding in different parts of the body.

Answer: B
 The globin genes first arose in invertebrates, specifically the ancestors of modern-day polychaete worms.

Answer: E
 All forms of human globins do not bind oxygen with the same affinity. For example, fetal hemoglobin binds oxygen more tightly than adult hemoglobin.

Therefore, the correct statement about the globin genes is C: Different tissues in mammals will express different globin genes.

Which Statement About the Globin Genes Is True