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1. 
Number of chromosomes in Down’s syndrome is
A.
46
B.
47
C.
45
D.
48
2. 
Shorter as well as longer end of t-RNA has
A.
Guanine
B.
Adenine
C.
Purine
D.
Pyrimidine
3. 
Which enzyme unwinds DNA double helix at the beginning of replication?
A.
DNA polymerase
B.
Primase
C.
Helicase
D.
DNA ligase
4. 
The sequence TTAGGACTTA after transcription, will have-
A.
Five adenine bases
B.
Three Uracil bases
C.
Three cytosine bases
D.
Two Guanine bases
5. 
Haplo-diploid sex determination system is found in-
A.
Drosophila melanogaster
B.
Grasshopper
C.
Biston betularia
D.
Apis dorsata