Question

1. overall, does glucose start out oxidized or reduced? what does it become? ______________
2. in general, how does nad+ become reduced? ______________
3. is glucose the only molecule that can be transformed in glycolysis? if not, what other molecules can enter glycolysis? ______________

b. pyruvate oxidation (occurs from the ____________ into the ____________)
carbon compounds in ____________ out ____________
nad+ nad
↓ → co2
redox reactions oxidized in ____________ reduced out __________ reduced in oxidized out ____________

Explanation:

Step1: Analyze glucose oxidation - reduction

Glucose is oxidized during cellular respiration to produce energy. It starts out reduced (has many C - H bonds) and becomes oxidized to carbon - dioxide.

Step2: Understand NAD+ reduction

NAD+ becomes reduced when it accepts a hydride ion (H - ) which consists of a proton and two electrons. In metabolic reactions, an enzyme - catalyzed reaction transfers the hydride from a substrate to NAD+ to form NADH.

Step3: Identify other glycolysis molecules

Glucose is not the only molecule. Fructose can be phosphorylated and enter glycolysis. Also, galactose can be converted to glucose - 6 - phosphate and enter glycolysis.

Answer:

1. Glucose starts out reduced and becomes oxidized.
2. NAD+ accepts a hydride ion (H - ) from a substrate in an enzyme - catalyzed reaction to become reduced to NADH.
3. Glucose is not the only molecule. Fructose and galactose can also enter glycolysis after being converted to appropriate intermediates.