Purines and pyrimidines refer to the ________ of the DNA molecules.
A) nitrogenous bases
B) sugar-phosphate backbone
C) hydrogen bonds
D) nucleus
E)
histones
A) nitrogenous bases
You might also like to view...
The introduction of a foreign species into an area where it is not native is called:a
parasitization. b. infestation. c. fragmentation. d. biotic pollution. e. commercial harvest
The suffix-viridae is used for virus
a) genus names. b) order names. c) phylum names. d) family names.
A term which applies to most trees which lose only a few leaves at a time is
A. deciduous. B. carnivorous. C. maple. D. hickory. E. coniferous.
The evolution of biochemical molecules started on Earth ____.
A. after the appearance of prokaryotic cells B. long before any cells emerged C. after the appearance of eukaryotic cells D. after the appearance of eukaryotic cells but before the appearance of multicellular organisms E. after the appearance of multicellular organisms