18090.Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
Cells need specific enzymes in order to function
Genes are made of DNA
Enzymes are required to repair damage
Genes carry information for making proteins
18093.The transcription of any gene is the indication of its
Induction
Activity
Stimulation
Hypersensitivity
18094.During translation initiation in prokaryotes, a GTP molecule is needed in
association of 30S, mRNA with formyl-met-t RNA
association of 50S subunit of ribosome with initiation complex
formation of formyl-met-tRNA
binding of 30 subunit of ribosome with mRNA
18095.Molecular basis of organ differentiation depends on the modulation in transcription by
Anticodon
RNA polymerase
Ribosome
Transcription factor
18096.The sequence of nitrogen bases in a particular region of the noncoding strand of a DNA molecule was found to be CAT GTT TAT CGC. What would be the sequence of nitrogen bases in the mRNA that is synthesized by the corresponding region of the coding strand in that DNA?
GUA CAA AUA GCC
GTA CAA ATA GCC
CAU GUU UAU CGC
CAA GAA TAU GCC
18097.Protein synthesis in an animal cell occurs
On ribosomes presents in cytoplasm as well as in mitochondria
On ribosomes present in the nucleolus as well as in cytoplasm
Only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
Only on the ribosomes present in cytosol
18098.Central dogma of protein synthesis is
DNA → RNA → Protein
DNA → DNA → Protein
RNA → DNA → Protein
DNA → Protein → RNA
18099.Gel electrophoresis is used for
Isolation of DNA molecule
Cutting of DNA into fragments
Separation of DNA fragments according to their size
Construction of recombinant DNA by joining with cloning vectors
18101.A gene of operon which synthesizes a repressor protein is ______.
Promoter gene
Regulator gene
Operator gene
Structural gene
18102.RNA polymerase is only capable of catalyzing the process of ______.
Termination
Elongation
Initiation
All of the above
18103.What is not true for genetic code?
It is unambiguous
A codon in mRNA is read in a non-contiguous fashion
It is nearly universal
It is degenerate
18104.The Segments of DNA, capable of moving from one location to another are
Introns
Transposons
Exons
Operons
18105.
Assertion: Replication and transcription occur in the nucleus but translation occurs in the cytoplasm.
Reason: mRNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Assertion is true statement but Reason is false.
Both Assertion and Reason are false statements.
18106.PCR and Restriction Fragment Length Polymorphism are the methods for
DNA sequencing
Genetic fingerprinting
Study of enzymes
Genetic transformation
18107.
Assertion: Amber codon is a termination codon.
Reason: If in a mRNA, a termination codon is present, the protein synthesis stops abruptly whether the protein synthesis is complete or not.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
18108.Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a ‘‘triplet'?
Beadle and Tatum
Nirenberg and Matthaei
Hershey and Chase
Morgan and Sturtevant
18109.Removal of introns and joining of exons in a defined order during transcription is called
Slicing
Splicing
Looping
Inducing