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Damm [24]
3 years ago
14

"Now that you have come up with an equation that describes the relationship between amounts of different nucleotide bases in DNA

, can you use it to predict the amounts of all four nucleotide bases when you only know the amount of one type of base? Approximately 21% of the human genome is comprised of nucleotides containing C. Given this information, calculate the percentage of the human genome that is comprised of nucleotides containing G, T, and A."
Biology
2 answers:
zepelin [54]3 years ago
8 0

Answer:

C- 21%

G- 21%

A - 29%

T - 29%

Explanation:

Four nucleotides make up the DNA molecule, and the sum of all four nuceleotides must equal 100% i.e.

A + G + C + T = 100%

If A -T and G - C pairs in the DNA, it means they each nucleotide must contain same proportion as its complementary pair. Therefore, if C is 21%, G is Al 21%.

Hence, 21 + 21 = 42%

We are left with the proportion of the other two nucleotides (A and T). We find it by saying 100 - 42 = 58%

Hence, if A and T must contain equal proportion, each will contain 58/2 = 29%.

The proportions of the four nuceleotides are 21, 21, 29 and 29 % for C, G, A and T respectively.

Dima020 [189]3 years ago
4 0

Answer:

G - 21%

T - 29%

A - 29%

Explanation:

Nucleotide bases in DNA are complementary. Adenosine (A) binds to Thymine (T) while Cytosine (C) binds to Guanine (G). Hence the composition of A in DNA is the same as that of T; and that of C is the same as that of G.

From the information given, C is 21%

Therefore G is also 21% of the genome as  C is bound to G, the therefore are the same proportion.

C and G make up 42% of the genome (that 21% + 21%).

The remaining 58% (100%-42%) is made up of A + T

Similarly the proportion of A is equal to that of T,

Hence A is 29% (half of 58%) and T is 29%.

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