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Rho-dependent and rho-independent transcription termination mechanisms operate in prokaryotes. Rho independent termination mechanism involves
A
Binding of the rho protein upstream of the termination element
B
No protein factors and only RNA secondary structure and run of 'U's
C
Presence of UGA or UAA stop codons
D
Binding of accessory factors at termination signal
Correct Answer:
No protein factors and only RNA secondary structure and run of 'U's
Rho protein, that is necessary for transcription termination, is a ________
A
Homotetramer
B
Heterotetramer
C
Heterohexamer
D
Homohexamer
Planar mechanisms and spherical mechanisms are included under spatial mechanisms. True or false?
A
True
B
False
Match the following Types of mechanism Motion achieved P. Scott Russel mechanism 1. Intermittent motion Q. Geneva mechanism 2. Quick return motion R. Off set slider crank mechanism 3. Simple harmonic motion S. scotch Yoke mechanism 4. Straight line motion
A
P-2,Q-3,R-1,S-4
B
P-3,Q-2,R-4,S-1
C
P-4,Q-1,R-2,S-3
D
P-4,Q-3,R-1,S-2
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism
A
1, 2 and 4
B
2, 3 and 4
C
1, 2 and 3
D
1, 3 and 4
Rho dependent termination mechanism doesn’t reguire____________
A
ATP
B
Stem loop structure
C
G-C rich stem
D
Sigma factor
As temperature increases, the electrical resistivities of pure metals $$\left( {\rho m} \right)$$ and intrinsic semiconductors $$\left( {\rho s} \right)$$ vary as follows
A
Both $$\rho m$$ and $$\rho s$$ increase
B
Both $$\rho m$$ and $$\rho s$$ decrease
C
$$\rho m$$ increases and $$\rho s$$ decreases
D
$$\rho m$$ decreases and $$\rho s$$ increases
The moment of inertia of a uniform sphere of radius, r about an axis passing through its centre is given by $$\frac{2}{5}\left( {\frac{{4\pi }}{3}{r^5}\rho } \right).$$ A rigid sphere of uniform mass density $$\rho $$ and radius R has two smaller spheres of radii $$\frac{R}{2}$$ hollowed out of it as shown in the figure given below.
The moment of inertia of the resulting body about Y-axis is
A
$$\frac{{\pi \rho {R^5}}}{4}$$
B
$$\frac{{5\pi \rho {R^5}}}{{12}}$$
C
$$\frac{{7\pi \rho {R^5}}}{{12}}$$
D
$$\frac{{3\pi \rho {R^5}}}{4}$$
At time t = 0, a charge distribution $$\rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)$$ exists within an ideal homogeneous conductor of permittivity $$\varepsilon $$ and conductivity $$\sigma $$. At a later time $$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right)$$ is given by
A
$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \left( { - \frac{{\sigma t}}{\varepsilon }} \right)$$
B
$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \frac{{\rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)}}{{1 + {{\left( {\frac{{\sigma t}}{\varepsilon }} \right)}^2}}}$$
C
$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \left$$
D
$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \frac{\varepsilon }{{\sigma t}}\sin \left( {\frac{{\sigma t}}{\varepsilon }} \right)$$
The resonance widths $$\Gamma $$ of $$\rho ,\,\omega $$ and $$\phi $$ particle resonances satisfy the relation $${\Gamma _\rho } > {\Gamma _\omega } > {\Gamma _\phi }$$ . Their lifetimes r satisfy the relation
A
$${\tau _\rho } > {\tau _\omega } > {\tau _\phi }$$
B
$${\tau _\rho }
C
$${\tau _\rho } {\tau _\phi }$$
D
$${\tau _\rho } > {\tau _\omega }
Variation of electrical resistivity $$\rho $$ with temperature T of three solids is sketched (on different scales) in the figure, as curves P, Q and R.
Which one of the following statements describes the variations most appropriately?
A
P is for a superconductor and R for a semiconductor
B
Q is for a superconductor and P for a conductor
C
Q is for a superconductor and R for a conductor
D
R is for a superconductor and P for a conductor