A bacterial cell was transformed with a recombinant DNA that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be:
| 1. | human genes may have intron which bacteria cannot process |
| 2. | amino acid codons for humans and bacteria are different |
| 3. | human protein is formed but degraded by bacteria |
| 4. | All of the above |
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