Answer:E. Adenine and Guanine
Explanation:
They are double <u>double carbon- nitrogen rings with four nitrogen atoms</u> bases found in DNA and RNA. Purines always pair with pyrimidines(cytosine and thymine) to form a double helix structure.This precise paring ensured that the DNA has a complementary structure.
This paring of purines with pyrimidines is by hydrogen bonds. This is to ensure easily unwinding during replication, that is formation of new DNA molecules.
purines bases are also used for cell protein synthesis fro cell division.
The anther is to produce pollen.
Answer:
can u put that in english plz bc i dont understand you
Explanation:
Each sp2<span> hybrid orbital on a carbon atom contains one electron. Figure 9.21 shows how the four C</span><span>H </span><span> bonds are formed by overlap of </span>sp2<span> hybrid orbitals on C with the 1</span>s<span> orbitals on each H atom. We use eight electrons to form these four electron-pair bonds. The C</span><span>C </span><span> bond is formed by the overlap of two </span>sp2<span> hybrid orbitals, one on each carbon atom, and requires two more electrons. The C</span>2H4<span> molecule has a total of 12 valence electrons, 10 of which form the one C</span>C and the four C<span>H </span><span> bonds.</span>
