Which statement is true of DNA?
It is used by ribosomes for translation.
Successive nucleotides in a strand are connected by hydrogen bonds.
A phosphate group in a nucleotide is attached to the 3' carbon in ribose.
A purine always forms a complementary base pair with a pyrimidine.
The percentage of the purine A always equals the percentage of the purine G.

Which is the correct formula for photosynthesis

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.

What is the major difference between a virus and a viroid?