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Pre-lab questions.

1. Why do strawberry cells need DNA?
2. If you observe a cell nucleus under a compound microscope, you will not see a molecule of DNA. Why will you be able to see the DNA you extract.
3. Use what you know about DNA to predict some of the physical properties of DNA.
4. How could you determine what percentage of a strawberry's mass is DNA?

1.To break down the cell wall, cellular and nuclear membranes.

2.In a cell, nucleus can be seen by a simple compound microscope, while DNA molecules cannot be seen under a compound microscope. This is because, DNA molecules are too small and these molecules are dispersed in nucleus in less compact state.

3.In living organisms such as humans, DNA exists as a pair of molecules rather than a single molecule. These strands are entwined in the shape of a double helix and the helix is kept stable by hydrogen bonds, which can be found between the bases attached to the two strands

4.Filter the materials suspended in the substrate to isolate the strands of DNA. Use imaging tools to find the exact mass of the DNA. Divide that mass by the mass of the strawberry piece and multiply by 100% to get the percentage of the strawberry's mass that is DNA.

Explanation:

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.