Recent questions tagged ch6

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 ?

asked Apr 3, 2014 by pady_1

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

asked Apr 3, 2014 by pady_1

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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

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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 ?

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

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Eukaryotic DNA replication is ________ in nature.

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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___________.

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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.

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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 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 ?

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

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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 ?

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In eukaryotes, which is the initiating amino acid ?

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

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

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

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Which amino acids are represented by a single codon ?

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

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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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In an ac circuit $E=E_0\;\sin wt$ and $I=I_0 \sin (wt -\large\frac{\pi}{2})$ the power consumption in circuit is

asked Mar 27, 2014 by meena.p

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Two coaxial solenoids are made by winding their insulated wire over a pipe of cross sectional area $A= 10\;cm^2$ length $20\;cm$ .One of the solenoids has 200 turns and another 400 turns. the mutual inductance is .

asked Mar 27, 2014 by meena.p

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Two induction coil of inductance $L_1$ and $L_2$ are separated by a considerable distance. On connectivity them in series the equivalent inductance is

asked Mar 27, 2014 by meena.p

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A circular loop of radius R, carrying current I lies in $X-Y $ plane with its centre at origin. The total magnetic flux through $X-Y$ plane is

asked Mar 27, 2014 by meena.p

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When a wire loop is rotated in a magnetic field, the direction of induced emf

asked Mar 26, 2014 by meena.p

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The current flowing in two coaxial coils is in the same direction. If we increase the distance between the two , the electric current will,

asked Mar 26, 2014 by meena.p

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A conducting ring of radius R is placed in a magnetic field perpendicular to the plane of the coil at the rate of $\beta$. Then Which one is correct ?

asked Mar 26, 2014 by meena.p

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A thin semicircular ring of radius 'a' is falling with its plane vertical to a horizontal magnetic field induction $\overrightarrow {B}$ .At the given position PQR the speed of ring is 'v' , the potential difference developed across the ring.

asked Mar 26, 2014 by meena.p

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A coil of inductance $L= 150\;mH$ and resistance $R= 70\;m \Omega$ is connected to a voltage source. How soon will the voltage attain $50\%$ of initial value

asked Mar 25, 2014 by meena.p

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A conducting rod of length $l=2\;cm$ moves with velocity 12 m/s at an angle $30^{\circ}$ to a magnetic field produced between two square faced poles of side 2 cm. If flux leaving the face is $5 \mu Wb$ the induces emf is

asked Mar 25, 2014 by meena.p

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A 1200 turn coil of mean area $500 \;cm^2 $ is held perpendicular to a uniform field of $4 \times 10^{-4}$ tesla. The resistance of coil is $20 \Omega$ . What will be the average induced current when coil turns through $180^{\circ}$ in $0.1\;$second?

asked Mar 25, 2014 by meena.p

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In an ac circuit with combination of L and C which one of following represents the variation of frequency f with reactance X?

asked Mar 25, 2014 by meena.p

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In the circuit given the switch is closed at time $t=0$ What is the amount of charge passing through the battery in are time constant ?

asked Mar 24, 2014 by meena.p

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