DNA and RNA are similar in having

1.Distance between two successive nitrogenous bases or base pairs of DNA is

(a) 34 Å
(b) 3.4 Å
(c) 10 Å
(d) 5 Å
Answer: (b)

2.DNA and RNA are similar in having

(a) Similar nucleotides
(b) Similar pyrimidines
(c) Similar purines
(d) Similar sugars
Answer: (c)

3.DNA and RNA show similarity in having

(a) Polymers of nucleotides
(b) Similar pyrimidines
(c) Double strands
(d) Similar sugars
Answer: (a)

4.DNA does not occur in

(a) Nucleus
(b) Ribosomes
(c) Mitochondria
(d) Plastids
Answer: (b)

5.DNA duplex shows

(a) Right handed coiling and parallel
(b) Right handed coiling and antiparallel
(c) Left handed coiling and antiparallel
(d) Left handed coiling and parallel
Answer: (b)

6.DNA is composed of repeating units of

(a) Ribonucleosides
(b) Deoxyribonucleosides
(c) Ribonucleotides
(d) Deoxyribonucleotides
Answer: (d)

7.DNA replication in eucaryotes commences

(a) From both ends of a chromosome simultaneously
(b) Several sites along DNA of a chromosome simultaneously
(c) From centromere to either end
(d) From one end of chromosome to the other
Answer: (b)

8.DNA replication is

(a) Conservative and discontinuous
(b) Semiconservative and semidiscontinuous
(c) Semiconservative and discontinuous
(d) Conservative
Answer: (c)

9.DNA resembles RNA as both have

(a) Polymers of nucleotides
(b) Similar sugars
(c) Similar pyrimidine bases
(d) Ability to replicate
Answer: (a)

10.DNA sequence is ATG. What would be the sequence of bases in anticodon of tRNA

(a) ATG
(b) AUG
(c) UAC
(d) TAC
Answer: (b)

11.DNA sequence is TAG. What shall be the sequence in anticodon of tRNA

(a) UAG
(b) ATC
(c) ATG
(d) UAC
Answer: (a)

12.DNA sequence of ATTCGATG is transcribed as

(a) AUUCGAUG
(b) UAAGCUAC
(c) CAUCGAAU
(d) GUAGCUUA
Answer: (b)

13.DNA strand with nitrogen base sequence ATTGCC will have sequence in mRNA

(a) UAACGC
(b) ATCGCC
(c) ATTGCA
(d) AGGACC
Answer: (a)

14.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
(c) Three strands have radioactivity
(d) Radioactivity is absent in all strands
Answer: (b)

15.Double helical structure of DNA was proposed by

(a) Kornberg
(b) Nirenberg
(c) Watson and Crick
(d) Wilkins and Franklin
Answer: (c)

16.Functional unit of gene that specifies synthesis of one polypeptide is

(a) Codon
(b) Cistron
(c) Recon
(d) Muton
Answer: (b)

17.Gene is segment of

(a) RNA
(b) DNA
(c) RNA or DNA
(d) Both DNA and RNA
Answer: (b)

18.Genetically engineered bacteria are being used in commercial production of

(a) Melatonin
(b) Testoteron
(c) Human insuline
(d) Thyroxine
Answer: (c)

19.Haploid plant cultures are got from
(a) Leaves
(b) Root tip
(c) Pollen grain
(d) Buds
Answer: (c)

20.Hydrogen bonds present between cytosine and guanosine are

(a) 2
(b) 3
(c) 1
(d) 4
Answer: (b)