The Molecule Report
A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L4
Interview Prompt
Given a DNA sequence string, return a dict with: 'nucleotide_counts' (dict of A/C/G/T counts), 'gc_content' ((G+C)/total*100 as float, 0.0 for empty sequence), 'most_common_dinucleotide' (the most frequent 2-char substring; tie-break alphabetically, empty string if len<2), 'is_valid' (True iff the sequence contains only A, C, G, T). NULL gc_content for empty is 0.0.
Summary
Four letters. A lot of math hidden in the sequence.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision