Download SGBAU BSc 2019 Summer 1st Sem Biotechnology Cell Biology n Biomolecules Question Paper

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B.Sc. (Part-I) Semester—I Examination

1S : BIOTECHNOLOGY (R/V)

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(Cell Biology and Biomolecules)

Time : Three Hours] [Maximum Marks : 80

Note :— (1) All questions are compulsory.

(2) Draw well labelled diagrams wherever necessary.

1. (A) Fill in the blanks :
   1. Eukaryotic cells have a true ______ with nuclear envelope.

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   2. Protein part of enzyme is called ______
   3. Codons are present on ______
   4. Replication of DNA occurs during ______ phase of cell cycle.
   2
2. (B) Choose correct alternatives :
   1. Singer and Nicolson model of plasma membrane differ from Robertson model in :
      1. Number of lipid layers

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      2. Arrangement of Lipid layers
      3. Arrangement of proteins
      4. Absence of Proteins
   2. 70S ribosomes are present in :
      1. Prokaryotes

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      2. Eukaryotes
      3. Present in both (a) and (b)
      4. Absent in both (a) and (b)
   3. Other than nucleus DNA is also present in :
      1. Golgi Complex

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      2. Ribosomes
      3. Chloroplast and Mitochondria
      4. Endoplasmic reticulum
   4. The monosaccharide is often called as :
      1. Simplex Sugar

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      2. Complex Sugar
      3. Both (a) and (b)
      4. None of above
   2

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3. (C) Answer in one sentence :
   1. Who Discovered Nucleus ?
   2. What is Mitosis ?
   3. Define enzyme.
   4. What are Polysaccharides ?
   4

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2 Explain :

1. Concept of cell theory.
2. Differences in Prokaryotic and Eukaryotic cells.
3. Endosymbiont theory.

OR

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1. Oparin — Haldane hypothesis.
2. RNA World.
3. Exceptions to cell theory.

4

3 Explain :

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1. Biological role of Carbohydrates
2. Importance of Biomolecules.
3. Properties of Triglycerides

OR

1. Properties of lipids.

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2. General properties of organic molecules
3. Importance of Polysaccharides.

4

4 Describe :

1. Functional aspects of tRNA

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2. Nitrogenous bases in DNA.
3. Classification of enzymes.

OR

1. Functional aspects of mRNA
2. Industrial applications of enzymes.

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3. Secondary structure of proteins.

4

5 Describe the ultra structure and function of Chloroplast in detail.

OR

Describe the structure and function of Nucleus in detail.

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12

6 Describe in detail. density gradient and differential centrifugation.

OR

Describe in detail. various methods of cell lysis.

12

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7 Explain :

1. Cell junction.
2. Interphase in cell cycle
3. Applications of stem cells.

OR

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1. Cancer.
2. Cell-cell signalling.
3. Prophase-I1 of meiosis

12

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