This image shows an X-ray diffraction photograph of DNA, like those made by Rosalind Franklin and Maurice Wilkins. Which of the following
best describes what was learned about DNA from images like this one?

Purines have two carbon rings, while pyrimidines have one.

DNA is composed of millions of nucleotides bonded in a chain.

There are four possible kinds of nucleotides in DNA.

DNA has a double-helical structure

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."