Question

1. the proportions of the bases are consistent within a species; however they do vary between species. using the base - pair rules, complete the following table to show the percentage of each type of base in the five different organisms.

organism	adenine	guanine	cytosine	thymine
cow	28		21
salmon
wheat	27	19
yeast	31	19

Explanation:

Step1: Recall base - pair rules

In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). So, the percentage of A = T and the percentage of G = C.

Step2: Calculate missing values for each organism

For the first organism: Since G = 19, C = 19. Let the percentage of A be \(x\) and T be \(x\) (A=T). Then \(x + x+19 + 19=100\), \(2x=100-(19 + 19)=62\), \(x = 31\).
For human: T = 31 (because A = 31).
For cow: Since A = 28, T = 28. Since C = 21, G = 21.
For salmon: Since A = 27, T = 27. Since G = 23 (because \(100-(27 + 27+23)=23\)), C = 23.
For wheat: Since A = 27, T = 27. Since G = 19, C = 19.
For yeast: Since A = 31, T = 31. Since G = 19, C = 19.

Answer:

Organism	Adenine	Guanine	Cytosine	Thymine
Human	31	22	22	31
Cow	28	21	21	28
Salmon	27	23	23	27
Wheat	27	19	19	27
Yeast	31	19	19	31