GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3130406 Date: 30/11/2019
Subject Name: Cell Biology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Marks | |
|---|---|
| Q.1 (a) What are Plasmodesmata and what are their functions? | 03 |
| (b) Explain the fluid mosaic model with a diagram | 04 |
| (c) Differentiate between the Nucleoid and the Nucleus, and write a short note on Plasmids | 07 |
| Q.2 (a) What are the functions of the cytoskeleton. | 03 |
| (b) Enlist all prokaryotic vesicles and explain the function of gas vesicles. | 04 |
| (c) Compare the role of eicosanoids and steroid/lipid signal molecules. | 07 |
| OR | |
| (c) Compare the cell wall structure of gram positive and gram negative cell walls | 07 |
| Q.3 (a) Mitochondria are responsible for generation of energy in the eukaryotic cell. Which organelle is responsible for energy generation in prokaryotes similarly. | 03 |
| (b) Write notes on Chemotaxis and Phototaxis | 04 |
| (c) Explain the secretory pathway for proteins with respect to the roles of endoplasmic reticulum and-golgi complex. | 07 |
| OR | |
| Q.3 (a) How does the JAK/STAT pathway regulate cell functions. | 03 |
| (b) Explain how RAS protein malfunction leads to cancer. | 04 |
| (c) What are non receptor tyrosine kinases explain with the example of cytokine receptors. | 07 |
| Q.4 (a) Draw a labeled diagrams of eukaryotic cell cycle phases and events of M'phase. | 03 |
| (b) You have a mixed population of cells and through a Fluorescent assisted cell sorter, you find out that 47% of the cells have double the DNA of the rest of the cells. What percentage of cells are in G1 phase? Justify your answer in a single paragraph. | 04 |
| (c) Explain the process of lysosome maturation | 07 |
| OR | |
| Q.4 (a) Define apoptosis and Gap junctions | 03 |
| (b) Write a note on Chloroplasts and evaluate which of the prokaryotic organelles is responsible for the function of chloroplasts | 04 |
| (c) Elaborate on different modes of cell signalling with example of signal molecules. | 07 |
| Q.5 (a) What do you understand by the term akaryotic? give two examples of the same. | 03 |
| (b) Explain G-protein coupled receptors with diagram. | 04 |
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| (c) Explain the journey of life from the basic unit of life to the Biosphere | 07 |
| Q.5 (a) What are stem cells? How is Nitro glycerine used for immediate treatment of heart attack? | 03 |
| (b) Evaluate and explain what would happen with respect to cell division if there is DNA break during the G1, S, or G2 phase. | 04 |
| (c) Write a note on the apoptotic caspases and evaluate the effect of a defective P53 gene on the cell | 07 |
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