Updated introduction to bioinformatics

[narashimha05]

Description

Fix #(issue)
Added additional code examples for MutableSeq.

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[davidRFB]

Hi @narashimha05 I Took a look. Thanks. One thing, did you check that the tutorial of Exploring_Quantum_Chemistry_with_GDB1k.ipynb works on colab ? If executed on local from the tutorials folder there is no problem. But if it is executed from colab the file does not exist and then breaks.

For the bioinformatics, in Colab there is these lines:
!curl -Lo conda_installer.py https://raw.githubusercontent.com/deepchem/deepchem/master/scripts/colab_install.py import conda_installer conda_installer.install() !/root/miniconda/bin/conda info -e
Dont think are needed since the pip install --pre deepchem works.

In the PR there is a small addition of the SDF format for the exploring Quantum Chem tutorial
and for the intro to Bioinformatics the additions are simple and complement a bit the MutSequence objects.

@shreyasvinaya @rbharath Do you think this fix can be added in this small PR? or done separately?