Chromosome and DNA — Biology MCQs (Class 12)
Free chapter-wise Biology MCQs with answers for MDCAT, FSc and entry tests.
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#41 Which one of the following experiment proved that, DNA replication is semiconservative?
A) Griffith exp
B) A very exp
C) Hershey and chase exp.
D) Meselson-stahl exp.
#42 Replication bubble is formed due to the activity of
A) DNA helicase
B) DNA polymerase
C) DNA ligase
D) None of these
#43 Short oligonucleotide strands of RNA which act as start site for the activity of DNA polymerase are called
A) SSB
B) Primers
C) Promoters
D) Okazaki fragments
#44 The replacement of primers by DNA nucleotides is carried out by
A) DNA polymerase I
B) DNA polymerase II
C) DNA polymerase III
D) DNA ligase
#45 RNA polymerase consists of 4 segments α, β, β’ and
A) ¥
B) Sigma
C) £
D) None of these
#46 Protein coding sequence of primary mRNA are called
A) Exon
B) Intron
C) Non-sense codon
D) None of these
#47 Which one of the following is post-transcriptional modification of mRNA?
A) Elongation phase
B) Termination phase
C) RNA splicing
D) None of these
#48 Which one of the following is responsible for the process of cellular differentiation, though all the cells possess the same genosome sequence?
A) Gene regulation
B) Pangenesis
C) DNA Gyrase
D) 7-methyl GTP
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