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ATB · Motif finding

7 questions · 26 marks · 2 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Algorithmic Thinking in Bioinformatics

Motif finding

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

End Term · 31 Aug 2025 (FN)End Term

Q1MCQ5 Marks·Choose one option
Key ↓
1. ATACC, ATGT, CGGC, ACTA
2. BACCT, TGTC, GGCG, CTAA
3. CTACC, TGTC, GGCG, CTAA
4. DACCT, ATGT, CGGC, ACTA
Read the passage below, then answer Q2–Q3
Based on the above data, answer the given subquestions.
Q2NAT4 Marks·Write the number
Key ↓
How many 6-mers in the sequence ‘ATTCCGGCCAACAG’ have a nonzero probability of binding to the TF according to the PWM given in the table? Enter the answer as a single integer.
Your answer:
Q3MCQ4 Marks·Choose one option
Key ↓
Which of the following substrings is most likely to be bound by the TF?
1. ATTCCGG
2. BCCGGCC
3. CATTCCG
4. DCCAACA

Quiz 2 · 3 Aug 2025 (AN)Quiz 2

Q4MCQ5 Marks·Choose one option
Key ↓
1. AFigure I: Gibbs Sampling; Figure II: Randomized Motif Search; Figure III: Greedy Motif Search
2. BFigure I: Gibbs Sampling; Figure II: Greedy Motif Search; Figure III: Randomized Motif Search
3. CFigure I: Greedy Motif Search; Figure II: Randomized Motif Search; Figure III: Gibbs Sampling
4. DFigure I: Randomized Motif Search; Figure II: Gibbs Sampling; Figure III: Greedy Motif Search
Read the passage below, then answer Q5–Q7
Q5MCQ2 Marks·Choose one option
Key ↓
Find the consensus of the motifs?
1. ATCATGA
2. BAACCGT
3. CTCTAAA
4. DTCATAA
Q6NAT2 Marks·Write the number
Key ↓
Your answer:
Q7NAT4 Marks·Write the number
Key ↓
Calculate the entropy of the first column. Round up the answer to 3 decimal places.
Your answer:

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q1D

Q23

Q3D

Q4B

Q5D

Q616

Q71.57 to 1.58

Questions and answer keys are reproduced from the official IIT Madras BS papers. Topics and repeated question types are BTechi’s own grouping. BTechi is not affiliated with IIT Madras.