What did this x-ray crystallography indicate about dna? a. the ratios of the base pairs were always one to one b. the structure of dna was helical c. dna contained hydrogen bonds d. the building blocks of dna were called nucleotides.

The correct answer is: b. The structure of DNA was helical

This photo known as Photo 51 is an X-ray diffraction image of crystallized DNA made by Rosalind Franklin. This photo helped Watson and Crick to define the final structure of DNA molecule. This diffraction pattern was essential for the construction of DNA model and it determined the helical nature of the double antiparallel helix strands.

albert einstein retrieved guacamole from the galapagos islands in africa

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.