IGNOU BBYET-141 June 2023 Previous Year Question Paper

Q1.(a) Fill in the blanks : 1×5=5

(i) Mitochondria are the main sites for the synthesis of

(ii) The cells which are responsible for reproduction are known as

(iii) In DNA both the nucleotide chains run in directions.

(iv) Spectrophotometer works on the

(v) In plant cell is the cementing layer present between primary wall of adjacent cells.

(b) Define the following terms : 1×3=3

(i) Mesosomes

(ii) Thylakoids

(iii) Plectonemic coiling

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

(i) Visible light is used for viewing a magnified image in a light microscope.

(ii) HPLC is a technique used for detecting compounds present in low amounts in a sample.

(iii) ‘Cilia’ are the cellular appendages that help in mobility of cell in higher plants.

(iv) Robert Hooke first observed cell in the cork of an oak plant.

Q2.Describe the structure of a eukaryotic cell with a proper labelled diagram.

Q3.Describe various stages of Mitosis with the help of well labelled diagrams.

Q4.Describe the major components of cytoskeleton of a cell with the help of well labelled diagram.

Q5.(a) Describe the structure of mitochondrial and chloroplast DNA along with proper labelled diagram. 5

(b) Discuss the function and structure of Lysosome.

Q6.Discuss ‘Operon Concept’. Describe its structure and role in gene regulation. 10 [ 4 ]

Q7.Describe Griffith’s experiment for demonstration of DNA as a genetic material with proper labelled diagram.

Q8.Write short notes on the following : 2 2×4=10

(i) Golgi apparatus

(ii) Function of cell wall in plants

(iii) Clover leaf model of t-RNA

(iv) Enzyme Telomerase 2023 -141 1×5=5

(iii) 1×3=3

(iii) 1 ×4=22

(iii) 2×4=10

(iii) t-RNA BBYET–141 5,3

(90)