Question

question 17 of 23
© macmillan lea
adenine
thymine
sugar - phosphate backbone
sugar - phosphate backbone
cytosine
guanine
nitrogenous bases
where are the hydrogen bonds found in this dna molecule?
□ between h in guanine and n in cytosine
□ between n and h in the nucleotide containing guanine
□ between h in adenine and o in thymine
□ between c and h in sugars in the backbone

Explanation:

In a DNA molecule, hydrogen - bonds form between complementary nitrogenous bases. Adenine (A) pairs with Thymine (T) through two hydrogen - bonds (between H in adenine and O in thymine and another between H in adenine and N in thymine). Guanine (G) pairs with Cytosine (C) through three hydrogen - bonds (between H in guanine and N in cytosine and other hydrogen - bonds). The sugar - phosphate backbone is held together by covalent bonds, not hydrogen - bonds. And the bonds within a single nucleotide are covalent, not hydrogen - bonds.

Answer:

between H in adenine and O in thymine, between H in guanine and N in cytosine