Basic Concepts of Cell Biology — DU B. Sc. (Hons) Biochemistry Previous Year Question Papers

There are six questions. Attempt ary four questions. • 1. (a) State True or False and justify your answer : (i) Chloroplast is also called a semi-autonomous organelle. Glycosylation of proteins takes place in only endoplasmic reticulum. (iti) Lysosomal enzymes function at neutral pH. (iv) Microfilaments play a major role in nutrient absorption. (v) Integrins are important components of cell membrane. (vi) Emerin is located on inner membrane of mitochondria. (b) Define the following : (ili) Focal adhesion (iv) Lysosomal storage disease. 9,6 (a) Describe briefly the polymerization and organization of microtubules. (6) Draw a well labelled diagram of mitochondria and write down its functions. (c) Describe briefly on histochemical staining techniques. 6,5,4 3. Differentiate the following : (i) Mitosis and meiosis (iii) Pinocytosis and phagocytosis. 5,5,5 (a) Describe the structure of light microscope and elaborate on its working principle. (6) Explain the transport of proteins to nucleus. (c) Draw a well labelled diagram of nuclear pore complex. 6,5,4 5. Write short notes on the following : (i) - Biogenesis and functions of peroxisomes (ii) Actin binding proteins (iii) Protein glycosylation in endoplasmic reticulum. 6,5,4 (a) Describe briefly structure, assembly and functions of intermediate filaments. (b) Describe briefly structure and functions of cell matrix proteins with at least two suitable examples. (c) Elaborate on connexin proteins and plasmodesmata with the help of diagrams. 6,5,4