Excerpt from: alfred the great — part b
lance carson

after that alfred agreed a peace, and for the next five years the danes busy in other parts of england.
look at the blank with the number 12 in the passage. which of these answers correctly completes the sentence?
a) are
b) is
c) was
d) were

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.

What's your question?