Question

Assume that a 100 base pair dna double helix contains 4 cytosines how many adenine and guanine are there

Answer 1

G pairs with C
A pairs with T

45 cytosines, 45 guanines
55 adenines, 55 thymines 
Cytosine pairs with Guanine, and Adenine pairs with Thymine.
This means, that if there are 45 cytosines, there must be 45 guanines.
So that's 90 base pairs down.
That means that there are 10 left between adenine and thymine- so that means there are 5 adenines. 

Answer 2

Assuming that a 100 base pair DNA double helix contains 4 cytosines, then there are 4 guanines that pair with 4 cytocines and 96 adenines.

DNA is a double helix composed of two polynucleotide chains.

In DNA, there are four types of nucleotides, each containing one different nitrogenous base, i.e., adenine, guanine, cytosine and thymine.

According to the base pair rules, adenine always pairs with thymine, whereas guanine pairs with cytosine.

In conclusion, assuming that a 100 base pair DNA double helix contains 4 cytosines, then there are 4 guanines that pair with 4 cytocines and 96 adenines (200 nucleotides - 4 guanines - 4 cytocines = 192 >> 96 adenines + 96 thymines = 192).

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