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A and B in the following reactions are: (i) $R-C(O)Cl + H_2 \xrightarrow{Pd/BaSO_4} A$ (ii) $R-C \equiv N + SnCl_2 + HCl \xrightarrow{H_3O^+} B$
Which one of the following acts as an inducer for lac operon?
If the DNA percentage of thymine is 20%, then what is the percentage of guanine?
The unequivocal proof of DNA as the genetic material came from the studies on:
Differentiation of organs and tissues in a developing organism is associated with:
A light bulb and an inductor coil are connected to an AC source through a key as shown in the figure below. The key is closed and after some time an iron rod is inserted into the interior of the inductor. The glow of the light bulb:
Match the items given in Column I with those in Column II and select the correct option given below: Column I: a. Tricuspid valve, b. Bicuspid valve, c. Semilunar valve. Column II: i. Between left atrium and left ventricle, ii. Between right ventricle and pulmonary artery, iii. Between right atrium and right ventricle.
The symbolic representations of four logic gates are given. The logic symbols for OR, NOT and NAND gates are respectively:
Under which of the following conditions will there be no change in the reading frame of the following mRNA? 5'AACAGCGGUGCUAUU 3'
In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
A spherical body of mass m and radius r is allowed to fall in a medium of viscosity η. The time in which the velocity of the body increases from zero to 0.63 times the terminal velocity (v) is called time constant (τ). Dimensionally τ can be represented by:
Ten E.coli cells with 15N - ds DNA are incubated in medium containing 14N nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from 15N?
The distance covered by a particle undergoing SHM in one time period is: (amplitude = $A$)
Which of the following is an amino acid derived hormone?
To get output $1$ for the following circuit, the correct choice for the input is:
The lactose present in the growth medium of bacteria is transported to the cell by the action of:
Industrial melanism is an example of?
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?
An excited heavy nucleus ${}_{Z}^{A}\mathrm{X}$ emits radiations in the following sequence: $${}_{Z}^{A}\mathrm{X} \rightarrow {}_{Z-2}^{A-4}\mathrm{D}_1 \rightarrow {}_{Z-1}^{A-4}\mathrm{D}_2 \rightarrow {}_{Z-3}^{A-8}\mathrm{D}_3 \rightarrow {}_{Z-4}^{A-8}\mathrm{D}_4 \rightarrow {}_{Z-4}^{A-8}\mathrm{D}_5$$ where $Z, A$ are the atomic and mass number of element $\mathrm{X}$, respectively. The possible emitted particles or radiations in the sequence, respectively are:
When an object is shot from the bottom of a long, smooth inclined plane kept at an angle of 60$^{\circ}$ with horizontal, it can travel a distance $x_1$ along the plane. But when the inclination is decreased to 30$^{\circ}$ and the same object is shot with the same velocity, it can travel $x_2$ distance. Then $x_1:x_2$ will be: