Which of the following statements about the evolution of animal cell adhesion molecules is TRUE?
A)The genes for integrins are found in all opisthokonts, including animals, plants, and fungi.
B)Animal cell adhesion molecules evolved from protein families that originally performed other functions.
C)The genes for cadherins are only found in animals.
D)The genes for integrins are found only in multicellular organisms.
E)All of these choices are correct.

Question

Quizplus · Accepted Answer

Animal cell adhesion molecules, such as integrins and cadherins, evolved from protein families that originally performed other functions, such as extracellular matrix proteins and bacterial pili, respectively. The genes for integrins and cadherins are only found in animals, not plants, fungi, or other opisthokonts. The statement in option A is incorrect, as integrin genes are not found in plants and fungi. The statement in option D is also incorrect, as integrin genes are found in some unicellular organisms. Therefore, option B is the best choice as it is the only statement that is completely accurate.

Which of the Following Statements About the Evolution of Animal