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Histamine is secreted by:
Typhoid is caused by:
During injury, mast cells secrete:
During viral infection, the protein formed in host cells to resist is:
Use of anti-histamine and steroids give a quick relief from:
Which of the following is a pair of viral diseases?
Salmonella is related with:
Which one of the following statements is correct with respect to AIDS?
Amongst the following the total number of species NOT having eight electrons around central atom in its outermost shell, is $\text{NH}_3, \text{AlCl}_3, \text{BeCl}_2, \text{CCl}_4, \text{PCl}_5$ :
Which amongst the following molecules on polymerization produces neoprene?
The relation between $n_m$, ($n_m$ = the number of permissible values of magnetic quantum number ($m$)) for a given value of azimuthal quantum number ($l$), is
Some tranquilizers are listed below. Which one from the following belongs to barbiturates?
Which of the following statements are NOT correct? A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to study reaction mechanism. C. Hydrogen is used to make saturated fats from oils. D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any elements. E. Hydrogen reduces oxides of metals that are more active than iron. Choose the most appropriate answer from the options given below:
Intermolecular forces are forces of attraction and repulsion between interacting particles that will include : A. dipole - dipole forces B. dipole - induced dipole forces C. hydrogen bonding D. covalent bonding E. dispersion forces Choose the most appropriate answer from the options given below :
The correct order of energies of molecular orbitals of $\text{N}_2$ molecule, is
Given below are two statements : Statement I : A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside. Statement II : When nucleoside is linked to phosphorous acid at 5' -position of sugar moiety, we get nucleotide. In the light of the above statements, choose the correct answer from the options given below :
A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is $A_xB_y$, then the value of $x + y$ is in option
The number of $\sigma$ bonds, $\pi$ bonds and lone pair of electrons in pyridine, respectively are:
Which fish selectively feed on larvae of mosquitoes?
Widal test is used for the diagnosis of: