Question

1. what did you have to remove in order to join the fatty acid to glycerol?
2. you built a monoglyceride. what is a triglyceride?
3. build the amino acid glycine. r=h. sign - off:
4. build the amino acid alanine. r=ch₃. sign - off:
5. join glycine to alanine to build a dipeptide. sign - off:
6. what did you have to remove in order to join these two amino acids?

Explanation:

1. When joining a fatty acid to glycerol, a water molecule ($H_2O$) is removed through a dehydration - synthesis reaction.
2. A triglyceride is a lipid molecule composed of glycerol and three fatty acid chains.
3. Glycine has the structure $NH_2 - CH_2 - COOH$.
4. Alanine has the structure $NH_2 - CH(CH_3)-COOH$.
5. To join glycine and alanine to form a dipeptide, a peptide bond is formed between the amino group of one and the carboxyl group of the other through a dehydration - synthesis reaction.
6. To join two amino acids, a water molecule ($H_2O$) is removed as a by - product of the peptide bond formation.

Answer:

1. A water molecule ($H_2O$)
2. A lipid molecule composed of glycerol and three fatty acid chains
3. $NH_2 - CH_2 - COOH$
4. $NH_2 - CH(CH_3)-COOH$
5. Form a peptide bond through dehydration - synthesis
6. A water molecule ($H_2O$)