IGNOU BBYET-141 December 2024 Previous Year Question Paper

Q1.2008.

Q2.(a) Fill in the blanks with the correct option given in the parentheses : 1x5=5

(6) In 1827 Scottish botanist 0.. (Robert Hooke/Robert Brown) demonstrated the presence of nucleus. Gi) Electron microscopy is a technique that helps in getting ow... dow/high) resolution images of specimen.

(1) (Positive/Negative) staining method is used for examining very small objects in transmission electron microscope.

(iv) X-ray diffraction is a technique used to analyse the structure of oe (crystalline/liquid) materials.

(v) The principle of gel electrophoresis is based on the fact that ww. (arger/smaller) molecules move faster when present in gel matrix.

(b) Define the following terms : 1x3=3 @ Genome Gi) Synapses Gii) Anticodon

(c) State whether the following statements are ‘True’ or ‘False’ : 3x 4=2

(06) Polarizer is a device that transmits polarized light through the specimens.

(i) Different organic compounds are used to preserve different tissues. @ii) A point at which the progression of a cell to the next stage in the cell cycle goes smoothly is called a check point.

(iv) During Gi phase many genes become active, RNA and _ proteins are synthesized.

Q3.Describe the chromatographic techniques used for separation of biomolecules and explain in detail the column chromatography. 4+6=

(10)

Q4.Describe the Fluid Mosaic Membrane Model with the help of diagrams.

Q5.Explain the structure and functions of peroxisomes. 5+5=

(10)

Q6.Describe transformation experiments for confirmation of DNA as a genetic material.

Q7.Describe the process of transcription in eukaryotes.

Q8.Explain model system for gene regulation in prokaryotes.

Q9.Write short notes on any two of the following : 2x5=10 @) Shadow casting Gi) Eukaryotic nucleus

(ii) Types of DNA

(iv) Ribosomes