The base pairs in a dna strand are held together with hydrogen bonds. in what way would a cell be most affected if these were covalent bonds instead? the cell would need to make new dna each time the strand was opened. the cell would only be able to open and close the dna strand when it replicated. the cell would have to take in and use more energy in order to break the covalent bonds. the cell would need to replace the nitrogenous bases each time the dna strand opened.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Describe characteristics of a good respitory surface

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species