When the Human Genome Was Sequenced, We Learned That There

question 23

Multiple Choice

When the human genome was sequenced, we learned that there are fewer than expected protein-coding genes (approximately 20,000) . Yet, the total number of proteins produced in humans approaches 100,000. What accounts for this discrepancy in numbers?

• A) We have not yet identified all of the open reading frames in the human genome.
• B) We have not yet fully sequenced the human genome.
• C) Processing mechanisms for mRNAs allow multiple proteins to be produced from a single DNA sequence.
• D) Some noncoding DNA sequences encode proteins.
• E) There has been a gross over-estimation of the number of proteins produced in humans.

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