St. Joseph’s College of Arts & Science (Autonomous) Cuddalore – 607001 PBC702 - Cell Biology and Molecular Genetics Time : 3 hrs
Max Marks :75
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SECTION A (15x1=15) Answer ALL the questions. I. Choose the Correct Answer 1. The dictyosomes are called as a) Ribosomes
b) Mitochondria
c) Golgi bodies
d) Lysosomes
2. The excitation followed by light emission in visible region through illumination of compound by UV rays is a) Fluoroscence
b) Bioluminenscence
c) Chemical inference
d) All the above
3. The subunits of microtubule are a) Podophyllotoxin
b) Vincristine
c) Tubulin
d) Vinblastin
4. All types of collagen contain repeating units of the following sequence a) Gly-Pro-X
b) Pro-Gly-X
c) Gly-Gly-X
d) Gly-Val-X
5. Cancers derived from immature precursor cells or embryonic tissue are a) Blastoma
b) Lymphoma
c) Carcinoma
d) Sarcoma 1
Q2/19/11R/13
II. Say True or False 6. The ribosomes of eukaryotic cells is 80S. 7. Amitosis is indirect cell division. 8. The cilia create food currents in lower aquatic animals. 9. Connexin is a Transmembrane protein. 10. All cancer cells are mutagens. III. Answer in One Sentence 11. What is peroxisome? 12. Define refractive index. 13. What is axoneme? 14. What is Laminin? 15. Define oncogenes. SECTION B (5x4=20) Answer ALL the questions 16. a) Explain the structure of nucleus. (Or) b) Write a note on the structure of mitochondrial. 17. a) Explain the principle of phase contrast microscopy. (Or) b) What is Meiosis? Explain its phases. 18. a) Write a note on actin. (Or) 2
Q2/19/11R/13
b) Explain the structure of axoneme. 19. a) How Cadherin mediates cell adhesion process. (Or) b) Write about the chemical components of ECM. 20. a) What are the causes of cancer? (Or) b) Explain the functions of Tumor suppressor genes. SECTION C (4x10=40) Answer any FOUR questions 21. Explain the fluid mosaic model of membrane structure.\ 22. Discuss the process of cell cycle. 23. Give a detailed account on structure, chemical composition and functions of microtubules. 24. Explain the method of chromosome walking. 25. Discuss the process of apotosis. 26. Write an elaborate note on Collagen. ************
What is axoneme? 14. What is Laminin? 15. Define oncogenes. SECTION B (5x4=20). Answer ALL the questions. 16. a) Explain the structure of nucleus. (Or).
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Write about the secondary structure of RNA molecule. 2. What are the properties that makes DNA as repository of. information? 3. State the three models of DNA ...
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