Heredity and genetics Sample Mcq Objective test Biology

Heredity and genetics Sample Mcq Objective test Biology
MCQ Quiz questions solution Genetics Practice
Heredity and genetics objective questions and answers


1. A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. The total number of nucleotides in this DNA fragment is
(a) 480
(b) 120
(c) 60
(d) 240
Ans. (a)


2. DNA replication is
(a) continuous and conservative
(b) discontinuous and semiconservative
(c) semidiscontinuous and semiconservative
(d) conservative and semidiscontinuous
Ans. (b)


3. Jumping genes are now known as
(a) transposons
(b) transversion
(c) transformation
(d) transduction
Ans. (a)


4. Which enzyme catalyses the synthesis of a new strand for a DNA molecule by linking nucleotides to the developing strand?
(a) RNA polymerase
(b) DNA ligase
(c) DNA polymerase
(d) Topoisomerase
Ans. (c)


5. Technique for detecting and screening the nutritional mutants in Neurospora crassa was developed by
(a) Beadle and Tatum
(b) Bateson and Punnet
(c) Luria Dulbecco
(d) Knoll and Ruska
Ans. (a)


6. Genetic code was deciphered by chemically synthesising nucleotides by ‘
(a) Watson and Crick
(b) Beadle and Tatum
(c) M. Nirenberg and H. Khorana
(d) K. Correns and Max Theiler
Ans. (c)


7. Nirenberg used an artificial mRNA poly U (UUU. . .U) which gave rise to polyphenyl alanine. This proved that
(a) artificial ,nRNA was not useful for the study of genetic code
(b) genetic code is triplet
(c) triplet UUU code for phenylalanine
(d) genetic code is non-overlapping
Ans. (c)


8. In protein synthesis the codon used as a start signal is
(a) UAA
(b) CCA
(c) AUG
(d) GCA
Ans. (c)



9. Termination of chain growth in protein synthesis is brought about by the codons
(a) UAA, UAG and UGA
(b) UCG, ACC and GCG
(c) UUG, UAG and UGA
(d) UGA, .UAG and AUG
Ans. (a)

10. Degeneracy in genetic code was found by
(a) A. Komberg
(b) Barbara Mc Clintock
(c) Bernfield and Nirenberg
(d) Hershey and Chase
Ans. (c)


11. Which of following has a clover leaf shaped structure?
(a) tRNA
(b) rRNA
(c) DNA
(d) mRNA
Ans. (a)


12. The process “translation” means
(a) DNA synthesis
(b) RNA synthesis
(c) protein synthesis
(d) ribosome assembly
Ans. (c)


13. Retrovirus has the following as its genetic material
(a) single stranded DNA
(b) double stranded duplex DNA
(c) DNA-RNA hybrid
(d) RNA
Ans. (d)


14. The information carried by RNA in retroviruses is put in the DNA &de by
(a) DNA polymerase
(b) DNA ligase
(c) RNA synthetase
(d) reverse transcriptase
Ans. (d)


15. A functional unit in a gene is
(a) muton
(b) recon
(c) cistron
(d) gene
Ans. (c)

16. The term genome is used for
(a) diploid set of chromosomes
(b) polyploid set of chromosomes
(c) triploid set of chromosomes
(d) haploid set of chromosomes
Ans. (d)


17. Which one of the following scientists got tile Nobel Prize for discovering the concept of mobile genetic elements in maize?
(a) Jacob and Monod
(b) Beadle and Tatum
(c) H. Khorana
(d) Barbara Mc Clintock
Ans. (d)


18. The recent techniques used for separating fragments of DNA is
(a) northern bloting
(b) southern bloting
(c) eastern bloting
(d) western bloting
Ans. (b)


19. The first step in genetic engineering as
(a) isolation of protein
(b) purification of protein
(c) isolation of genetic material
(d) isolation of RNA
Ans. (c)

20. H. HARRIS and J.F. WATKINS in 1965 first time reported the fusion of following cell lines to form hybrids
(a) mouse and man
(b) mouse and hamster
(c) mouse and chick erythrocytes
(d) mouse and Drosophila
Ans. (a)

21. Term hybridoma implies
(a) DNA-RNA hybrid
(b) recombination of DNA molecules
(c) somatic hybridisation
(d) gametic fusion
Ans. (c)


22. Who among the following discovered the enzyme restriction endonuclease?
(a) Hamilton Othanel Smith
(b) Sir Godfrey Hounsfield
(c) F. Jacob
(d) Andre Lwoff
Ans. (a)


23. Genetic engineering is used in
(a) gene therapy
(b) vaccine production
(c) obtaining transgenic plants
(d) all of the above
Ans. (d)

24. Hybridisation through protoplast fusion is known as
(a) parthenogenesis
(b) parasexual hybridisation
(c) sexual hybridisation
(d) asexual hybridisation
Ans. (b)

25. The transgenic animals are those that have
(a) foreign DNA in some of its cells
(b) foreign DNA in all its cells
(c) foreign RNA in all its cells
(d) both (a) and (c)
Ans. (b)