Biology of Cell: Structure and Function — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

2. Answer any FOUR questions including Question No. 1. (a) Define the following (any three: (3) (b) Differentiate between the following (any four): (i) Promoter and Enhancer (ii) Group 1 and Group II introns (iv) Sigma factor and Transcription factor (v) Autocrine and Paracrine signaling (c) Expand the following : (3) (d) State the function of the following (any four) : (iv) 7-methyl guanosine cap (b) What are the properties of stem cells? Write a brief note on iPSCs. (7) 3. (a) Comment upon the following : (7) (i) Degeneracy and Unambiguity of genetic code (il) Fidelity of protein synthesis 4. (a) Explain the mechanism of transcription termination in prokaryotic and eukaryotic mRNAs. (7) (b) Describe the post transcriptional modifications of eukaryotic mRNA. (7) 5. (a) Illustrate semiconservative, semidiscontinuous and bidirectional nature of DNA replication with suitable diagrams (No description required). (7) (b) Discuss the role of various enzymes / proteins involved in DNA replication in prokaryotes. 6. (a) How can one gene produce many different proteins? Explain with examples. (7) (b) Describe the process of translation in prokaryotes.