The human genome and invertebrate genomes encode similar numbers of protein doma

Question

The human genome and invertebrate genomes encode similar numbers of protein domains, yet the human genome encodes many more proteins. How can the human genome encode more proteins using the same number of protein domains?

A. A genome duplication in the human genome doubled the number of proteins.

B. Humans have a higher mutation rate than invertebrates.

C. Genetic recombination occurs more frequently in humans than in invertebrates.

D. The human genome uses more combinations of the same domains.

E. A greater percentage of the human genome encodes proteins.

Explanation / Answer

The correct answer is the human genome uses more combinations of the same domains. Human have splicing machinery that remove introns and join exons and different combinations of exons joining lead to the different proteins

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