Hershey and chase used the 35s isotope to label proteins. how does this isotope differ form the 32s isotope found in greatest natural abundance, and why did they choose 35s instead of 32s?
a. 35s has more protons than 32s; hershey and chase used it because it has greater mass
b. 35s has fewer protons than 32s; hershey and chase used it because it is radioactive and can be easily traced
c. 35s has more neutrons than 32s; hershey and chase used it because it is radioactive and can be easily traced
d. 35s has fewer neutrons than 32s; hershey and chase used it because it has less mass

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.