Rho dependent termination mechanism doesn’t reguire___________

ATP

Stem loop structure

G-C rich stem

Sigma factor

Sigma factor plays no role in termination, rather it dissociates long before the RNA pol terminates. Rho however requires ATP for its rolling function and the stem loop structure formation. This stem loop structure is strengthened by G-C rich regions in the stem.

Rho-dependent and rho-independent transcription termination mechanisms operate in prokaryotes. Rho independent termination mechanism involves

Binding of the rho protein upstream of the termination element

No protein factors and only RNA secondary structure and run of 'U's

Presence of UGA or UAA stop codons

Binding of accessory factors at termination signal

Rho shows base preference although it doesn’t have any concensus cis binding sequence. Which region will be expected to bind Rho better?

G and C rich region

A and T rich region

Region rich in C and poor in G

Region rich in A and poor in T

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

P-2,Q-3,R-1,S-4

P-3,Q-2,R-4,S-1

P-4,Q-1,R-2,S-3

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

1, 2 and 4

2, 3 and 4

1, 2 and 3

1, 3 and 4

As temperature increases, the electrical resistivities of pure metals $$\left( {\rho m} \right)$$ and intrinsic semiconductors $$\left( {\rho s} \right)$$ vary as follows

Both $$\rho m$$ and $$\rho s$$ increase

Both $$\rho m$$ and $$\rho s$$ decrease

$$\rho m$$ increases and $$\rho s$$ decreases

$$\rho m$$ 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

$$\frac{{\pi \rho {R^5}}}{4}$$

$$\frac{{5\pi \rho {R^5}}}{{12}}$$

$$\frac{{7\pi \rho {R^5}}}{{12}}$$

$$\frac{{3\pi \rho {R^5}}}{4}$$

An insulating sphere of radius a carries a charge density $$\rho \left( {\overrightarrow {\bf{r}} } \right) = {\rho _0}\left( {{a^2} - {r^2}} \right)\cos \theta ;\,r

d-1

d-2

d-3

d-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

$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \left( { - \frac{{\sigma t}}{\varepsilon }} \right)$$

$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \frac{{\rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)}}{{1 + {{\left( {\frac{{\sigma t}}{\varepsilon }} \right)}^2}}}$$

$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \left$$

$$\rho \left( {\overrightarrow {\bf{r}} ,\,t} \right) = \rho \left( {\overrightarrow {\bf{r}} ,\,0} \right)\exp \frac{\varepsilon }{{\sigma t}}\sin \left( {\frac{{\sigma t}}{\varepsilon }} \right)$$

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

$${\tau _\rho } > {\tau _\omega } > {\tau _\phi }$$

$${\tau _\rho }

$${\tau _\rho } {\tau _\phi }$$

$${\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?

P is for a superconductor and R for a semiconductor

Q is for a superconductor and P for a conductor

Q is for a superconductor and R for a conductor

R is for a superconductor and P for a conductor