Question

question 1-1
which statement about the structure of dna is not true?
long strands of dna are twisted in the form of a double helix
dna contains four different nitrogen bases in including adenine, guanine, cytosine and uracil
dna consists of two strands joined together by complimentary base pairing
dna is made of linked nucleotides which are each made of a sugar, a phosphate and a nitrogen base

Explanation:

DNA contains four nitrogen - bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Uracil (U) is found in RNA, not DNA. Long strands of DNA form a double - helix, consist of two strands with complementary base - pairing, and are made of nucleotides with a sugar, phosphate, and nitrogen - base.

Answer:

B. DNA contains four different nitrogen bases including adenine, guanine, cytosine and uracil