Identify true statements about the synthesis of various lipids.
a. Triacylglycerols are synthesized by adding fatty acid groups to a glycerol backbone.
b. The triacylglycerol biosynthetic pathway provides the precursors for the synthesis of glycerophospholipids.
c. Glycerophospholipids may be synthesized from diacylglycerols.
d. Triacylglycerols are synthesized by adding ketone bodies to a glycerol backbone.
e. Arachidonate is a precursor in the synthesis of prostaglandins.
f. The glycerophospholipid biosynthetic pathway provides precursors for the synthesis of triacylglycerols.

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.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.