41. What does operon contain ?
A. Regulator gene + promotor gene
B. Operator gene + structural gene
C. Regulator gene + promotor gene structural gene
D. Regulator gene + promotor gene + operator gene + structural gene
Answer : Option D
42. Select correct match with respect to lac-operon model ?
A. Active represser + inducer \(\rightarrow \) Inactive repressor
B. Active repressor + corepressor \(\rightarrow \) Inactive repressor
C. Inactive repressor + inducer \(\rightarrow \) Active repressor
D. Inactive repressor + corepressor \(\rightarrow \) Active repressor
Answer : Option A
43. In relation of lac operon in E-coli , Which protein is not regulated by the repressor ?
44. Which is not correct regarding the activity of helicase during DNA replication ?
A. Cuts hydrogen bonds
B. Requires ATP
C. separates DNA strands
D. Stabilizes single strands
Answer : Option C
45. Which of the following enzyme is not produced by E. coli during lactose catabolism ?
A. ? - galactosidase
B. Thioglactoside translacetylase
C. Lactose dehydrogenase
D. Lactose permease
Answer : Option C
46. Which is the incorrect statement regarding HGP ?
A. HGP is an Indian scientific research project
B. In 1990, the Project was initiated
C. A working draft of the genome was announced in 2000
D. In February 2001, the analysis of the working draft was published
Answer : Option A
47. Humans have approximately _____ times more genes than E.coli
48. Which of the following is not according to the chargoff’s rule ?
Select the correct answer / answers from the following
1. Ligase :- Joins short segments of DNA together
2. DNA Polymerase :- cuts DNA at specific sequence
3. Helicase :- Breaks the hydrogen bonds between complementary pairs during DNA replication
4. Gyrase : - Joins weak hydrogen bonds between complementary pairs
A. 1, 2, 3 and 4, are corrent
B. 1 and 2 are correct, 3 and 4 are false
C. 1 and 3 are correct, 2 and 4 false
D. 1, 2, 3 are correct, 4 is false
Answer : Option C
50. DNA replication in eukaryotes is
A. Unidirectional with many origin
B. Bidirectional with many origin
C. Unidirectional with single origin
D. Bidirectional with single origin
Answer : Option B