Multiple Choice QuestionsWhich of the following constitute about 10-20% of total circular RNA?
m-RNA
r -RNA
t-RNA
hn -RNA
Non-coding sequences of DNA are:
exon
intron
rhizoids
cistron
A.
exon
A segment of DNA that is both transcribed into RNA and translated into protein is called exon whereas the segment of DNA that is transcribed from eukaryotic DNA but removed before the mature m-RNA is translated into protein is called Introns.
Mutations which alter nucleotide sequence within a gene are :
frame shift mutations
base pair substitutions
both 'a' and 'b'
none of these
Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?
E. coli
Nostoc
Drosophila
Neurospora
A point mutation comprising the substitution of a purine by pyrimidine is called
transition
translocation
deletion
transversion
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