Adna double helix is 500 nucleotides long, so it contains a total of 1,000 nucleotides between the two strands of the double helix. if 300 of those nucleotides are adenine (a), how many would be guanine (g) g

200

Explanation:

According to Chargaff's rules , Adenine pairs with Thymine and Guanine pairs with Cytosine, so in a DNA double helix the number of A bases equals the number of T bases, and the number of G bases = C bases.

If 300 nucleotides are A, then 300 are also T.

A+T= 600 nucleotides out of 1000, so the remaining 400 must be G+C.

Because the number of G equals the number of C, there must be 200 Guanine nucleotides in that molecule.

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explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.