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The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal lengths of lenses are:
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:
A nucleus with Z = 92 emits the following in a sequence: $\alpha, \beta^-, \beta^-, \alpha, \alpha, \alpha, \alpha, \alpha, \beta^-, \beta^-, \alpha, \beta^+, \beta^+, \alpha$. The Z of the resulting nucleus is:
Which of the following reactions cannot form new carbon-carbon bonds?
Which one of the following is the starter codon?
Which one of the following is an example of Hormone releasing IUD?
With respect to nucleosome, which of the following statements is incorrect?
Given below are two statements: Statement-I: The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample. Statement-II: The half life of a radionuclide is the sum of the life time of all nuclei, divided by the initial concentration of the nuclei at time t=0. In the light of the above statements, choose the most appropriate answer from the options given below:
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 nucleus of mass number 189 splits into two nuclei having mass numbers 125 and 64. The ratio of the radius of two daughter nuclei respectively is:
The symbolic representations of four logic gates are given. The logic symbols for OR, NOT and NAND gates are respectively:
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.
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:
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?
Out of the following, the only pair that does not have identical dimensions is