Question

question 4
1 pts
in dna, the amount of cytosine is always equal to the amount of ______.
uracil
adenine
guanine
two of these
cytosine

Explanation:

In DNA, base pairing follows Chargaff's rules: cytosine (C) pairs with guanine (G), so their amounts are equal. Uracil is in RNA, adenine pairs with thymine, and cytosine doesn't equal itself in this context. So the correct base is guanine.

Answer:

C. guanine