What percentage of human chromosomes are made up of protein-coding genes?

• A. 50-60%
• B. 1-2%
• C. 25-30%
• D. 10-15%

Answer: (B)

Verified step by step guidance

1. Understand that human chromosomes are composed of DNA, which includes both protein-coding genes and non-coding regions.
2. Recognize that protein-coding genes are segments of DNA that are transcribed into mRNA and then translated into proteins.
3. Consider that the majority of the human genome consists of non-coding DNA, which includes introns, regulatory sequences, and repetitive elements.
4. Research or recall that only a small fraction of the human genome is made up of protein-coding genes, typically around 1-2%.
5. Compare the given options with the known percentage of protein-coding genes in the human genome to identify the correct answer.