Question

Of the total base sequence in human DNA, what percentage codes for proteins? A) Nearly 50 percent
B) About 5 percent
C) About 90 percent
D) 100 percent

Answer 1

Answer:

The correct answer is B)About 5 percent

Explanation:

The approximate total size of the human nuclear genome is 3,200,000,000 base pairs. 1 to 1, 4% encode proteins, 24% are non-coding regions and the rest correspond to intergenic regions.

Answer 2

Of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).

• DNA is a double helix molecule composed of two long chains of nucleotides.

• This molecule (DNA) is composed of sequences that encode proteins called genes and non-coding regions, which often play regulatory functions (i.e., non-coding nucleotide sequences are mainly involved in the regulation of gene expression).

• According to the human genome sequencing project, only 5% (or even a lesser proportion) of the human genome encode for proteins, thereby the remaining DNA consists of repetitive non-coding sequences.

In conclusion, of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).

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