18852.A nucleoside is formed of
Pentose sugar, phosphate and nitrogen base
phosphate and nitrogen base
Pentose sugar and phosphate
Pentose sugar and nitrogen base
18853.A nucleotide is formed of
Purine, Pyrimidine and phosphate
Purine, Sugar and phosphate
Nitrogen base, Sugar and phosphate
Pyrimidine, Sugar and phosphate
18855.A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is
120
240
60
480
18857.A Strand of DNA has base sequence CATGACTAG. The base sequence on the other strand would be
CAT TAG GAC
GTA CTG ATC
GAT GTC ATC
TAC ACT GCT
18858.A totipotent cell means
An undifferentiated cell capable of developing into a system or entire plant
An undifferentiated cell capable of developing into an organ
An undifferentiated cell capable of developing into complete embryo
Cell which lacks the capability differentiate into an organ or system
18864.Best method to determine paternity is
Protein analysis
Chromosome counting
Gene counting
DNA finger printing
18865.Polyethylene glycol is
Fusogenic chemical
Electro fusion stimulant
Callus stimulant
Differentiation stimulant
18866.Callus is
Tissue that forms embryo
An insoluble carbohdrate
Tissue that grows to form embryoid
Unorganised actively dividing mass of cells maintained in culture
18867.Chemical Knives/ molecular scissors of DNA are
Restriction endonucleases
Polymerases
Ligases
Transcriptases
18869.Choose the correct statement
DNA is hereditary material
RNA is hereditary material
DNA is hereditary material but where it is absent RNA can function as hereditary material
Both DNA and RNA are hereditary materials
18870.In tissue culture, callus can be induced to form shoot or root by altering the ratio of
Auxin to cytokinin
Cytokinin to ethylene
Auxin to gibberellin
Gibberellin to cytokinin
18871.Development of shoot and root in tissue culture is determined by
Cytokinin and auxin ratio
Enzymes
Temperature
Plant nutrients
18873.Which one of the following is used as vector for cloning genes into higher organisms?
Salmonella typhimurium
Retrovirus
Baculovirus
Neurospora crassa
18875.DNA and RNA are similar in having
Similar nucleotides
Similar pyrimidines
Similar purines
Similar sugars
18876.
Compare the statements A and B.
Statement A: Synthesis of DNA takes place in the S-phase of interphase.
Statement B: Every chromosome, during metaphase, has two chromatids.
Choose the correct description :
Statement A is correct and B is wrong.
Statement A is wrong and B is correct.
Both the statements A and B are correct and A is not the reason for B.
Both the statements A and B are correct and A is the reason for B.
18877.DNA and RNA show similarity in having
Polymers of nucleotides
Similar pyrimidines
Double strands
Similar sugars
18879.DNA is composed of repeating units of
Ribonucleosides
Deoxyribonucleosides
Ribonucleotides
Deoxyribonucleotides
18880.DNA replication in eucaryotes commences
From both ends of a chromosome simultaneously
Several sites along DNA of a chromosome simultaneously
From centromere to either end
From one end of chromosome to the other
18881.DNA replication is
Conservative and discontinuous
Semiconservative and semidiscontinuous
Semiconservative and discontinuous
Conservative
18882.DNA resembles RNA as both have
Polymers of nucleotides
Similar sugars
Similar pyrimidine bases
Ability to replicate
18883. Nif gene for nitrogen fixation is cereal crops like wheat, jowar etc. is introduced by cloning
Rhizobium meliloti
Bacillus thuringiensis
Rhizopus
Rhizophora
18885.DNA strand with nitrogen base sequence ATTGCC will have sequence in mRNA
UAACGC
ATCGCC
ATTGCA
AGGACC
18886.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
All strands have radioactivity
Half the strands have radioactivity
Three strands have radioactivity
Radioactivity is absent in all strands
18887.Double helical structure of DNA was proposed by
Kornberg
Nirenberg
Watson and Crick
Wilkins and Franklin
18888.Genetically engineered bacteria are being used in commercial production of
Melatonin
Testoteron
Human insuline
Thyroxine
18890.Which of the following tool makes possible genetic engineering?
Restriction endonuclease
DNA polymerase
Helicase
RNA polymerase
18893.In AGCT of DNA hydrogen bonds and base pairings occur between
A-U, C-G
A-C, G-T
A-G, C-T
A-T, C-G
18895.In callus culture, roots can be induced by the supply of
Auxin and no cytokinin
Higher concentration of auxin and lower concentration of cytokinin
Higher concentration of cytokinin and lower concentration of auxin
Both auxin and cytokinin in equal proportions.
18897.Biolistics (gene-gun) is suitable for
Constructing recombinant DNA by joining with vectors
Transformation of plant cells
Disarming pathogen vectors
DNA finger printing
18901.In tissue / bacterial culture glassware and nutrients are sterilized through
Water bath at 200° C
Dry air oven at 200° C
Dehumidifire
Autoclave