Recent questions tagged genetics and evolution

Most promoter sites for RNA polymeraseII have conserved sequence located about 25-35 bp upstream of the transcriptional start site known as

asked Apr 3, 2014 by pady_1

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In eukaryotic cell, RNA is synthesized by how many RNA polymerases ?

asked Apr 3, 2014 by pady_1

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In which condition, a trp repressor protein is synthesized but doesnt bind to the trp operator and thus trp operon is transcribed to produce enzymes that synthesize tryptophan for the cell ?

asked Apr 3, 2014 by pady_1

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Expand IPTG

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Who proposed the operon model for the regulation of transcription ?

asked Apr 3, 2014 by pady_1

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In which condition, the level of intracellular cAMP rises, CRP-cAMP complex is formed that stimulates transcription of the lac operon by using lactose as an alternative carbon source ?

asked Apr 3, 2014 by pady_1

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IPTG or allolactose in the process of lac operon is used as an

asked Apr 3, 2014 by pady_1

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Transcription of the operon is controlled by the lac repressor protein encoded by which gene ?

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The lac operon is transcribed by RNA polymerase to produce a ___________.

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$\beta$-galactosidase, galactose permease and thiogalactoside transacetylase are encoded by which of the following lac operon genes respectively?

asked Apr 3, 2014 by pady_1

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DNA replication occurs only in which phase ?

asked Apr 3, 2014 by pady_1

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Which protein helps in preventing the single stranded regions to base pair again, so that each of the two DNA strands is accessible for replication?

asked Apr 3, 2014 by pady_1

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During DNA replication in bacteria, the unwinding of the double helix (using ATP as energy source) is done by

asked Apr 3, 2014 by pady_1

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Which precursor is needed by DNA polymeraseI, during addition of dNTPs (dATP, dGTP, dTTP and dCTP) to the 3' OH end of the DNA chain ?

asked Apr 3, 2014 by pady_1

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E. coli DNA polymerases II and III lack which activity ?

asked Apr 3, 2014 by pady_1

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The primer used during DNA synthesis, is a short piece of RNA and is synthesized by RNA polymerase called

asked Apr 3, 2014 by pady_1

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Eukaryotic DNA replication is ________ in nature.

asked Apr 3, 2014 by pady_1

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Nucleosomes are organized into ____ diameter fiber.

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Nuclear DNA- protein complex is called

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In eukaryotic cell, (a) DNA in chromosomes consist of histone proteins like HU, HSP-1 and H-NS and (b) each chromosome contains a single linear double-stranded DNA molecule.

asked Apr 3, 2014 by pady_1

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Histone proteins are _______ in nature.

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In eukaryotic cell, the DNA is packaged into chromosomes and is present in___________.

asked Apr 3, 2014 by pady_1

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The DNA in a bacterium is a supercoiled double-stranded circular molecule that is packaged in the _______________region of the cell.

asked Apr 3, 2014 by pady_1

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Who worked out the three-dimensional structure of DNA starting from x-ray diffraction photographs taken by franklin and wilkins ?

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The complementary base pairing between the bases A:T & G:C are bonded by which bond ?

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The two DNA strands are organized in ______________ arrangement.

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On the other template strand (that has 5' 3' orientation) DNA polymerase synthesizes short pieces of new DNA in 5' 3' direction and then joins them, these are known as

asked Apr 3, 2014 by pady_1

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DNA polymerase I also corrects mistakes in DNA by removing mismatched nucleotides, it is known as

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Expand RFLP

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Which the given genetic terms refers to, a gene that masks the expression of the other ?

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Which of the following is the site of transcriptionally inactive DNA ?

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Which of the following is the site of synthesis of (or codes for) histone mRNA ?

asked Apr 3, 2014 by pady_1

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Which of the following are found only in organisms containing polycistronic mRNA ?

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Which of the following is most likely mechanism for the origin of multigene families ?

asked Apr 3, 2014 by pady_1

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Which of the following is not involved in the processing of mRNA precursors in eukaryotic cells ?

asked Apr 3, 2014 by pady_1

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During translation in prokaryotes, which sequence lies 5' to the AUG initiation codon and is the binding site for the 30S ribosomal subunit ?

asked Apr 3, 2014 by pady_1

1 answer

In eukaryotes, which is the initiating amino acid ?

asked Apr 3, 2014 by pady_1

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In prokaryotic ribosome, one of the binding sites for tRNA is P site which is responsible for ?

asked Apr 3, 2014 by pady_1

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The attachment of an amino acid to a tRNA is catalyzed by which enzyme ?

asked Apr 3, 2014 by pady_1

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Most amino acids in proteins are specified by more than one codon. Therefore, genetic codon is said to be

asked Apr 3, 2014 by pady_1

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Which amino acids are represented by a single codon ?

asked Apr 3, 2014 by pady_1

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During translation, the sequence of an mRNA molecule is read by _____________.

asked Apr 3, 2014 by pady_1

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Each codon is recognized by a triplet of bases, called an anticodon which is present in _____.

asked Apr 3, 2014 by pady_1

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Which of these are termination or stop codons ?

asked Apr 3, 2014 by pady_1

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Sickle cell anemia disease molecular basis, is the change of which amino acid residue for a valine at position 6 of the ?-chain ?

asked Apr 3, 2014 by pady_1

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