Question

less than 2% of human dna is composed of protein - coding dna—that is, genes containing instructions to make proteins. although nearly all cells in a multicellular organism contain the same dna, not every cell uses every gene. the remaining 98% of human dna, called non - coding dna, serves a variety of functions, including the regulation of which genes are active or inactive in certain cells. this regulation allows for specialized body cells that produce only specific proteins. select the true statements. all cells in a multicellular organism produce the same proteins. non - coding dna is important for cell specialization. each of an organisms cells contains a unique set of dna. only a small fraction of the dna in a human cell contains instructions to build proteins.

Explanation:

1. The text states that not every cell uses every gene, so cells don't produce the same proteins. So the statement "All cells in a multicellular organism produce the same proteins" is false.
2. It is mentioned that non - coding DNA regulates which genes are active or inactive in certain cells, allowing for specialized body cells, so non - coding DNA is important for cell specialization.
3. The text says nearly all cells in a multicellular organism contain the same DNA, not a unique set for each cell. So the statement "Each of an organism's cells contains a unique set of DNA" is false.
4. It is clearly stated that less than 2% of human DNA is protein - coding DNA, meaning only a small fraction of the DNA in a human cell contains instructions to build proteins.

Answer:

Non - coding DNA is important for cell specialization.
Only a small fraction of the DNA in a human cell contains instructions to build proteins.