In the 1950s, the race to solve the secondary structure of dna became intense. in an uncharacteristic rush to publish, linus pauling erroneously proposed a triple-stranded structure in february 1953. this model had the nitrogenous bases on the exterior and the sugar−phosphate backbones clustered in the middle. how does the orientation of the sugar−phosphate backbone in this model compare with the one proposed by watson and crick? do you think pauling's structure could exist in cells? why or why not?

Mike was adopted, and his biological family history is unknown. although he is healthy, he would like some understanding of his genetic makeup, including potential health risks and genes that he could pass on to his children. mike has heard about commercial laboratories that can compare segments of your dna to those of people with common hereditary diseases in order to give you some idea of how susceptible you are to the diseases. the results of these types of tests are highly inconclusive. if mike's dna showed that he shares similarities in a segment of dna with people who have a given disease, his chances of developing that disease or passing it on to his children may be slightly elevated, but they are not 100 percent. these tests can cost more than $2,500 and are not covered by many insurance companies. do you think that mike should undergo the genetic tests? explain your answer. what are the potential pros and cons of having such tests done? describe how the availability of these genetic tests might affect the frequency of genetic diseases in individuals and populations.

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.

Explain why the plants cortex would serve as the best food source for animals