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

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).

Learn more in:

link

C) electrons encircling a nucleus with neutrons and protons

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.