Biology of Animal Cells — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

Write short not'e'\s on any three : mD (a) Nuclear pore„ complex (b) Fluid mosaic model of plasma membrane Animal Cells (d) Endosymbiotic theory (e) Signal hypothesis 2. There are six (06) questions in this question paper. 1. (a) Define the following: (ii) Restriction point (b) Differentiate between the following : (3x2=6) (i) Heterochromatin and Euchromatin (ii) Mito.sis and Meiosis (iii) Active and Passive transport (c) Fill in the blanks : (4xl-4) is an example of one of the post- translational modifications that happens in the ER. formation is a mechanism for dosage compensation in mammalian females. (iii) Desmosomes have cytoskeletal elements that help in their cell-cell adhesion function. is the c.ell organelle where catalase is primarily present. (a) Describe the mechanism and different pathways of vesicular transport in a cell. (9) (b) Differentiate between tight junctions and gap junctions. (6) Explain how the various structural components of mitochondria help in generation of ATP during respiration. (a) Compare and contrast the structure, organization and function of micro filaments and microtubules. (b) Describe various levels of chromatin organization and packaging with emphasis on primary level. (a) What are the various components of cell cycle regulatory system? How do they regulate cell cycle? (1o) (b) Explain the mechanism of iin'Sdrt of materials in the nucleus.