LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

VE 15

FIFTH SEMESTER – April 2009

PB 5407 / PB 5404 – BIOINFORMATICS

 

 

 

Date & Time: 04/05/2009 / 1:00 – 4:00       Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

1. Choose the correct answer. (5 x 1 = 5)

1. Multiple sequence alignment is an extension of ——– alignment.

1. Pairwise Local           c. Global          d. Random

 

1. Exon is a ————- sequence

1. Nucleic acid Protein         c. Pairwise       d. Multiple

 

1. Splice sites are predicted using —————-.

2. Netgene2 Nebcutter2.0           c. Signalp        d. Pfam

 

1. Blastx is used to search ———- database using a translated nucleic acid query.

1. Protein Nucleic acid            c. Translated    d. mRNA

 

1. Pfam is a collection of  ————- alignment.

1. Multiple sequence Single          c. Protein         d. Nucleotide

 

1. State whether the following statements are true or false. (5 x1= 5)

1. Dot plot is a graphical method for comparison of two biological sequences.
2. Global alignment is used to align every residue in all sequences.
3. Pairwise – local alignment is used to find the best matching sequences.
4. ClustalW is an sequence alignment software.
5. Intron is also termed as non-intervening sequences.

 

III. Complete the following.                                                               (5 x 1 = 5)

1. Exon contains a part of the ————— that codes for a specific sequence.
2. FASTA format also termed as ——————— format.
3. MEDLINE  can be expanded as ———————.
4. RASMOL is a —————- visualizing tool.
5. ————- makes extensive use of sequence alignments in the construction and interpretation of species relationships.

 

1. Answer the following in about 50 words each. (5 x 1=5)

Define / Explain:

1. Sticky end cut
2. Motif
3. Splice site
4. DIP
5. Genscan

 

 

PART – B

Answer any FIVE of the following, each not exceeding 350 words.                        (5 x 8 =40)

 

1. Write notes on the biological sequences of nucleotides and proteins.
2. List out the applications of alignments and add a note on Needleman and Wunch algorithms.
3. Explain about FASTA and its types.
4. Discuss about the software used for the prediction of transition tools.
5. Write notes on Pfam and Prosite profiles.
6. Explain about different post translational modifications.
7. Describe the usefulness of RASMOL.
8. With illustrations explain DOT-PLOT.

 

PART – C

Answer any TWO of the following, each not exceeding 1500 words.          (2 x 20 = 40)

 

1. (a) Explain about Homology modeling, PubMed, Medline and Swissmodel.

Or

(b) Discuss on how to identify Motifs and Restriction sites.

1. (a) Explain Pairwise – Local alignment, ClustalW and Global alignment.

Or

(b) Write notes on softwares used in biological databases.

 

 

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