Question

Lactic Acid Fermentation
Lactic acid fermentation is an anaerobic process. It does not require oxygen. Pyruvic acid from glycolysis is converted to lactic acid in the cytoplasm. This frees NAD+ electron carrier molecules to return to glycolysis and make more ATP. Lactic acid fermentation is generally carried out by bacterial cells, but also occurs when animal muscle cells do not receive enough oxygen.

Drag and drop the missing molecules into the reactions

Answer 1

Sure! While I can't physically drag and drop elements into a reaction, I can help guide you through what the key components of lactic acid fermentation are. Here’s how the process looks in terms of reactants and products:

1. **Glycolysis:**
- Inputs: Glucose (C6H12O6), NAD+ (Nicotinamide adenine dinucleotide)
- Outputs: Pyruvic acid (pyruvate), ATP (energy), NADH (reduced form of NAD+)

2. **Lactic Acid Fermentation:**
- Inputs: Pyruvic acid (from glycolysis), NADH
- Outputs: Lactic acid, NAD+

### Overall Process:
1. Glycolysis:
- **Glucose + 2 NAD+ + 2 ATP → 2 Pyruvic Acid + 2 NADH + 4 ATP (net 2 ATP)**

2. Lactic Acid Fermentation:
- **2 Pyruvic Acid + 2 NADH → 2 Lactic Acid + 2 NAD+**

### Summary of the Reaction:
- **First part (Glycolysis)**: The glucose undergoes glycolysis to produce pyruvic acid and NADH.
- **Second part (Fermentation)**: The pyruvic acid is then converted into lactic acid while regenerating NAD+ from NADH. This regeneration is crucial as it allows glycolysis to continue and produce ATP in the absence of oxygen.

If you need assistance with a specific diagram or visual representation, feel free to ask!