Reflecting back on the course, what are three major themes you would identify that connect the various topics discussed in this course-how are they connect with what you knew before this course? What knowledge have you gained with regards to these three themes you have identified?

Three main topics that I have found interesteing are  proteins, amino acids, and enzymes. They are connected to each other and our existence depends on them. Amino acids are molecules which contain an amine group, a carboxylic acid group, and a side chain that is specific to each amino acid. Amino acids serve as building blocks of proteins. Proteins are derived from amino acids using information encoded in genes. Each protein has its own unique amino acid sequence
Proteins are biochemical compounds consisting of one or more polypeptides which are usually folded and facilitate biological functions. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residue. Like other biological macromolecules, proteins are essential parts of organisms and participate in every process within cells. Many proteins are enzymes that catalyze biochemical reactions and are vital to metabolism.
Enzymes are biological molecules that catalyze chemical reactions. Almost all chemical reactions in a biological cell need enzymes in order to occur. They work by lowering the activation energy for a reaction.
All three of these topics are crucial for the organisms and they have been covered in almost every class. I think everyone should know their main functions whether they major in natural sciences or social sciences.

How would you explain the connection between glucose entering the body and energy created by the body to a friend, using your new biochemistry knowledge?

Glucose can enter the body through the mouth. It does not need to be digested, but it can be absorbed directly. From the stomach, glucose is carried away by the blood stream. Then it is absorbed by the arteries to arterides to capillaries where it leaves the blood stream to go directly into a cell.
Cellular respiration allows organisms to use energy store in the chemical bonds of glucose (C6H1206). The energy in glucose is used to produce ATP. Cells use ATP to supply their energy needs. In respiration, glucose is oxidized and thus releases energy. Oxygen is reduced to form water. The carbon atoms of sugar molecule are released as carbon dioxide. The complete brakedown of glucose to carbon dioxide and water reqires two major steps: 1) glycolysis 2) aerobic respiration.
Glycolysis occur in the cytoplasm and does not require oxygen. There are ten steps in glycolysis and each one is catalyzed by a specific enzyme. In the end of the glycolysis 2 ATP molecules are produced.
The aerobic respiration requires oxygen and yields more energy. Aerobic respiration is divided into two processes, the krebs cycle and the Electron transport chain, which produces ATP through chemiosmotic phosphorylation. The aerobic respiration can produce 34 or more ATP if oxygen is present.

Ref Work

Campbell,M;Farrell,S. Biochemistry 7th edition. 

What knowledge have you connected with past knowledge?

Biochemistry is one of those subjects that really integrates several different other courses. One concept that I really connect with the past courses was the structures of different proteins. While protein structure was discussed in general biology going to the website where I could see all the 3D structures of the different proteins was actually quite interesting. Another concept that can be connected to a past course is from organic chemistry and the R groups of amino acids. I ended up getting a good grade for organic chemistry because I got to understand the structure of amino acids. I didn't have any trouble when I learned the reactions in organic chemistry. Recently we just covered the Krebs cycle and Glycolysis. Last semester I was enrolled in microbiology and I had a hard time understanding and distinguishing these two processes. I feel like I only memorized the steps of of Krebs cycle and Glycolysis and didn't get the way those cycles functioned. This semester we redid Krebs cycle and Glycolysis in biochemistry. I really appreciate your help. The slides that presented the Krebs cycle and Glycolysis helped me a lot because I tend to understand things easier when I look at the images.
These are just a few concepts connected from past coursework with many more to come in the future.