Who proved that DNA is basic genetic material?

Correct! Wrong!

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Hershey and Chase (1952) worked on Escherichia coli and conclusively proved that DNA is the genetic material.

The anticodon is in ____.

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The "adapter" molecule that recognizes nucleic acid sequence to protein sequence is tRNA.

In split genes, the coding sequences are called

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The region of a gene, which becomes part of m-RNA and code for different regions of the proteins are called exons.

During replication, the two strands of DNA separate at a point called ____.

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During replication, the two strands of DNA separate at a point called replication fork.

Because most of the amino acids are represented by more than one codon, the genetic code is

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All amino acids are specified by more than one codon (except tryptophan and methionine). Hence they are degenerate.

Which of the following is a sulphur containing amino acid?

Correct! Wrong!

Methionine is the sulphur containing amino acid because is has sulphur atom in side chain.

What is false about t-RNA?

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each t-RNA is charged with amino acid at its 3' end.

____ is not part of the lac operon.

Correct! Wrong!

Activator protein is not part of the lac operon.

Reverse transcriptase is

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The phenomenon of making DNA from RNA genome through enzyme reverse transcriptase is called reverse transcription.

Polymorphism arises due to ____.

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Polymorphism arises due to mutation.

DNA and RNA differ in ____.

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DNA and RNA differ in both sugar and bases.

A nucleotide is formed of

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Nucleotide is a unit of DNA, which is formed of nitrogenous bases (purines & pyrimidines), sugar (pentose) & phosphate.

Which amino acids are present in histones?

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Histones are low molecular weight proteins with high proportion of positively charged basic amino acids arginine and Iysine.

Protein helping in opening of DNA double helix in form of replication fork is

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DNA gyrase participates in the unwinding of DNA helix during replication.

Exon part of m-RNAs have code for

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Exons are the coding part of mRNA.

During protein synthesis, peptide bonds are formed at the ____.

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During protein synthesis, peptide bonds are formed at the ribosomes.

Changing the codon AGC to AGA represents a ____ mutation.

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Changing the codon AGC to AGA represents a missense mutation that is replacement of one amino acid with another. Such a mutation occurs due to base substitutions.

Transcription is initiated when RNA polymerase ____.

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Transcription is initiated when RNA polymerase attaches to a promoter molecule.

Digestion with ____ will inhibit the process of transformation.

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Digestion with DNases will inhibit the process of transformation. They are DNA digesting enzymes.

Which is not involved in protein synthesis?

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Protein synthesis stops when a nonsense codon (UAA, UGA or UAG) reaches the amino acyl or A site.

Ligase helps in

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Ligase helps in joining DNA molecules.

The genetic material in the nucleus is located in the ____.

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The genetic material in the nucleus is located in the chromosomes.

Transformation experiment was first performed on which bacteria?

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Transformation is transfer of genetic material (exogenous )of one organism to another.

The basic structural unit of the DNA is ____.

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The basic structural unit of the DNA is nucleosome.

The process of translation is

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Protein synthesis occurs over ribosomes which are also referred to as protein factories.

The last chromosome to be sequenced in the HGP was ____.

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The last chromosome to be sequenced in the HGP was chromosome I in 2006.

The transcribing enzyme is ____.

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The transcribing enzyme is RNA polymerase.

Operon model' for gene regulation in bacteria was proposed by

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Operon model was given by Jacob and Monad (1961) for regulation of protein synthesis in prokaryotes.

In the structure of DNA ____ binds with cytosine.

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In the structure of DNA deoxyribose binds with cytosine.

DNA template sequence of CTGATAGC is transcribed over mRNA as

Correct! Wrong!

During transcription, from the DNA template complementary mRNA is formed and thymine is replaced by uracil.

Class 12th Biology - 6 Molecular Basis of Inheritance MCQs
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Class 12th Biology - 6 Molecular Basis of Inheritance MCQs