This means that a single carbon atom can form up to tetravalent bonds with other atoms
Answer:
1. Purines
2. States that DNA composition varies among species
3. Hydrogen Bond
4. Purines
<em>Answer to #2 is a little iffy </em>-- sorry
Explanation:
Pyrmidines have two rings
Purines have one ring
Complementary bases are connected by hydrogen bonds.
Answer:
point of view is a particular attitude or way of considering a matter.
Explanation:
pls mark brainliest