IGNOU BBYET-141 December 2022 Previous Year Question Paper

Q1.(a) Fillin the blanks. 5x1=5

(i) Fluid mosaic model was proposed by and. Gi) A DNA structure in which two strands can be separated is defined as

(iii) Lysosomes were discovered by

(iv) DNA consists of types of nitrogenous bases.

(v) In plants, cell wall is mainly composed of .

(b) Define the following terms : 3x1=3 @ Retention factor

(ii) Somatic cell

(iii) Bacteriophages

(c) State whether the following statements are ‘True’ or ‘False’ : 4x 5 =2

(i) Lens which is used to observe image in a microscope is known as ‘eyepiece’.

(ii) Cells like leucocytes cannot change their shape.

(iii) Gel electrophoresis is used to separate nucleic acids of different charges.

(iv) Euchromatin is less condensed as compared to heterochromatin.

Q2.(a) Enlist the major differences between plant and animal cell.

(b) Explain Chargaffs Rule. 5x2=

(10)

Q3.Describe the structure, composition and functions of mitochondria along’ with well-labelled diagram.

Q4.Describe various stages of Meiosis I with the help of a well-labelled diagram. 6+4=

(10)

Q5.Describe Meselson and Stahl experiments to explain semi-conservative mode of replication in DNA.

Q6.Explain Operon concept. Describe its structure and discuss its role in gene regulation.

Q7.(a) Describe double helix model of DNA with a neat well-labelled diagram.

(b) How is organization of DNA in Prokaryotes different from Eukaryotes ? Discuss. 5x2=

(10)

Q8.Write short notes on the following : bQ21 0

(a) Peroxisomes

(b) tRNAs

(c) | Endosymbiotic theory

(d) Replication fork BBYET-141 4 ‘SAT: axing