Section A
Q1. Write a short note on each of the following : 8 × 5 = 40 Packaging of DNA in chromatin
(a) Chloroplast dimorphism
(b) Post-transcriptional modifications of mRNA |c| Role of endoplasmic reticulum in protein sorting and targeting
(d) Objectives and properties of probability
(e) 2.
(a) Describe the molecular basis of cell cycle transitions with suitable illustrations. Explain the role of CDKs in controlling transitions between cell cycle stages. 10+10=20
(b) Discuss the mechanism of transport of molecules across the cell membrane by uniport, symport and antiport. Add a note on co-transport by symporter and 15+5=20 uniporter. 3.
(a) Describe the molecular mechanism of gene linkage and crossing-over. Explain how gene mapping is constructed using gene linkage with suitable diagrams. 10+10=20
(b) Describe different methods of selection and hybridization in plant breeding. Give a note on heterosis breeding. 15+5=20 4.
(a) Describe different stages of micropropagation in detail, mentioning the significances of each stage. Give a brief account on commercial 15+5=20 micropropagation.
(b) Describe the initiation of translation process in prokaryotes with suitable illustrations. How does it differ from eukaryotes? 15+5=20