Download "Cell Biology-Botany Paper B" Previous Years Question Paper of B.Sc. (General) for 1st Semester.

B.Sc. (General) 1st Semester

BOTANY 
Paper-B: Cell Biology

Time Allowed: Three Hours] [Maximum Marks: 36 

Note:- Attempt five questions in all including Question No. 1, which is compulsory, and selecting one question from each unit. 

1. (A) Multiple choice questions:

(i) The linker DNA connecting two nucleosomes contains the following histone molecule : 

(a) H1 (b) - H2 ]

(c) H3 (d) H4 

(ii) The inner membrane of mitochondria investigates into finger-like enfolds known as: 

(a) Granules (b) Cristae

(c) Thylakoids (d) Cisternae 

(iii) The segments not required during translation and hence removed during splicing from mRNA are called : 

(a) Introns (b) Exons 

(c) Mutons (d) Cistrons 

(iv) Double trisomy is represented by :

(a) 2n + 1 (b) 2n + 1 + 1

(c) 2n-1          (d) 2n - 1 – 1

(v) RNA primer required during DNA replication is synthesized by the enzyme : 

(a) DNA polymerase 

(b) RNA polymerase 

(c) Primase 

(d) Reverse transcriptase 

(vi) Double metaphasic plate is seen during the following division: 

(a) Meiosis I 

(b) Meiosis II 

(c) Both Meiosis I and II 

(d) Mitosis 1x6=6 

(B) Fill in the blanks : 

(i) Lampbrush chromosomes are in__________stage of meiosis.

 

(ii) DNA is a double stranded helical macro-molecule made up of subunits known as__________.

 (iii) Various enzymes contained by lysosomes, which act on acidic pH, are generally known as _________.

(iv) Coupling factors (CF. - CF) present in thylakoids of chloroplast are involved in process of___________.

(v) The condensed, darkly stained, and late replicating part of chromatin is known as_________.

(vi) RNA polymerase binds itself to the_______ region of DNA template during transcription. 1*6=6

UNIT-I 

2. What are Ribosomes? Discuss in detail the ultra-structure of a eukaryotic ribosome along with well-labeled diagrams.6

3. Write in detail the structure of mitochondria along with well-labeled diagrams. Why it is called a semi-autonomous organelle? 6

UNIT-II 

4. What is Duplication? Give its types, effects, and importance. 6

5. Write short notes on the following: 

(a) Polytene chromosomes 

(b) Polyploidy.  3+3=6 

UNIT-III 

6. Give a detailed mechanism of DNA replication with the help of well-labeled diagrams. 

7. Briefly discuss the following: 

(a) Synaptonemal complex 

(b) Nucleosome. 3+3=6 

UNIT-IV 

8. Describe the structure and functions of various types of RNAS involved in the process of Translation. 6

9. Describe in detail the regulation of gene activity with respect to the Lac operon system.  6