The molecule coded directly from DNA is mRNA (messenger RNA). It's represented by number 2 in the central dogma of molecular biology.

Here's a breakdown of the central dogma:

1. DNA (deoxyribonucleic acid): The genetic blueprint of an organism.

2. mRNA (messenger RNA): A copy of a gene from DNA that carries the genetic code to the ribosome.

3. tRNA (transfer RNA): Carries amino acids to the ribosome to build proteins.

4. Protein: The functional molecule built according to the instructions in DNA.

So, the answer is 2.