13. Krebs Cycle and ETC require oxygen to occur, making them?

Acetyl CoA is produced during the process of Krebs cycle in the presence of oxygen.

Explanation:

Krebs cycle is also called citric acid cycle. This process is used by living organisms for the release of energy from food molecules in the process of aerobic respiration. In this chemical reaction, oxidation of acetyl-CoA occurs which is obtained from food molecules such as carbohydrates, proteins and lipids. When oxidation of food molecules occurs, energy is released in the form of Adenine tri phosphate (ATP) and carbondioxide gas is produced.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.