CBSE
Assertion : Plasmids are double stranded extrachromosomal DNA.
Reason : Plasmids are possessed by eukaryotic cells.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both the assertion and reason are false.
Mutations which alter nucleotide sequence within a gene are :
frame shift mutations
base pair substitutions
both 'a' and 'b'
none of these
Lac is obtained from :
Laccifer
Bombyx
Dactylopius
Lytta
Jumping genes in maize were discovered by:
Hugo de Vries
T.H. Morgan
Barbara McClintock
Mendel
Wobble hypothesis was given by
R.W. Holley
M. Nirenberg
H.G. Khorana
F.H.C. Crick
A point mutation comprising the substitution of a purine by pyrimidine is called
transition
translocation
deletion
transversion
Non-coding sequences of DNA are:
exon
intron
rhizoids
cistron
Assertion : Clones are a group of organisms of identical genotype, produced by a single parent through asexual means.
Reason : Clones exhibit high genetic variations.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both the assertion and reason are false.
Innitiation codon is :
AUG
UUU
UAG
AAG
Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?
E. coli
Nostoc
Drosophila
Neurospora