Chargaff's rules of base pairing are explained by which structural feature of DNA? A. Each strand of DNA contains a phosphate and sugar backbone. B. The nucleotides of DNA may appear in a wide variety of sequences. C. DNA is double stranded, and covalent bonds between identical nucleotides hold the strands together. D. DNA is double stranded, and hydrogen bonds between base pairs hold the strands together.

Which experiment would most likely contain experimental bias ?

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.