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Distance between two successive nitrogenous bases or base pairs of DNA is
(a) 34 Å
(b) 3.4 Å
© 10 Å
(d) 5 Å Answer: (b) -
DNA and RNA are similar in having
(a) Similar nucleotides
(b) Similar pyrimidines
© Similar purines
(d) Similar sugars Answer: © -
DNA and RNA show similarity in having
(a) Polymers of nucleotides
(b) Similar pyrimidines
© Double strands
(d) Similar sugars Answer: (a) -
DNA does not occur in
(a) Nucleus
(b) Ribosomes
© Mitochondria
(d) Plastids Answer: (b) -
DNA duplex shows
(a) Right handed coiling and parallel
(b) Right handed coiling and antiparallel
© Left handed coiling and antiparallel
(d) Left handed coiling and parallel Answer: (b) -
DNA is composed of repeating units of
(a) Ribonucleosides
(b) Deoxyribonucleosides
© Ribonucleotides
(d) Deoxyribonucleotides Answer: (d) -
DNA replication in eucaryotes commences
(a) From both ends of a chromosome simultaneously
(b) Several sites along DNA of a chromosome simultaneously
© From centromere to either end
(d) From one end of chromosome to the other Answer: (b) -
DNA replication is
(a) Conservative and discontinuous
(b) Semiconservative and semidiscontinuous
© Semiconservative and discontinuous
(d) Conservative Answer: © -
DNA resembles RNA as both have
(a) Polymers of nucleotides
(b) Similar sugars
© Similar pyrimidine bases
(d) Ability to replicate Answer: (a) -
DNA sequence is ATG. What would be the sequence of bases in anticodon of tRNA
(a) ATG
(b) AUG
© UAC
(d) TAC Answer: (b)
11. DNA sequence is TAG. What shall be the sequence in anticodon of tRNA
(a) UAG
(b) ATC
© ATG
(d) UAC Answer: (a)
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DNA sequence of ATTCGATG is transcribed as
(a) AUUCGAUG
(b) UAAGCUAC
© CAUCGAAU
(d) GUAGCUUA Answer: (b) -
DNA strand with nitrogen base sequence ATTGCC will have sequence in mRNA
(a) UAACGC
(b) ATCGCC
© ATTGCA
(d) AGGACC Answer: (a) -
Double chained DNA strand is made radioactive in both its chains. It is
allowed to replicate twice in non-radioactive medium. The result would be
(a) All strands have radioactivity
(b) Half the strands have radioactivity
© Three strands have radioactivity
(d) Radioactivity is absent in all strands Answer: (b) -
Double helical structure of DNA was proposed by
(a) Kornberg
(b) Nirenberg
© Watson and Crick
(d) Wilkins and Franklin Answer: © -
Functional unit of gene that specifies synthesis of one polypeptide is
(a) Codon
(b) Cistron
© Recon
(d) Muton Answer: (b) -
Gene is segment of
(a) RNA
(b) DNA
© RNA or DNA
(d) Both DNA and RNA Answer: (b) -
Genetically engineered bacteria are being used in commercial production of
(a) Melatonin
(b) Testoteron
© Human insuline
(d) Thyroxine Answer: © -
Haploid plant cultures are got from
(a) Leaves
(b) Root tip
© Pollen grain
(d) Buds Answer: © -
Hydrogen bonds present between cytosine and guanosine are
(a) 2
(b) 3
© 1
(d) 4 Answer: (b)