Recent questions without answers

Which class of antibody is first made by developing $B$ cells inside bone marrow?$IgG$$IgE$$IgA$$IgM$

Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$] regarding mammalian cells.Assertion [$a$]: Cells use $Ca^{2+}$, and not $Na^{...

Vincristine and vinblastine, two commercially important secondary metabolites from $Catharanthus\; roseus$, are examples ofalkaloidsflavonoidsterpenoidssteroids

$DNA$ synthesized from an $RNA$ template is calledrecombinant $DNA$transcript$T-DNA$complementary $DNA$

Two monomeric His-tagged proteins of identical molecular weight are present in a solution. pIs of these two proteins are $5.6$ and $6.8$. Which one of the following techn...

During a positive-negative selection process, transformed animal cells expressing __________________ are killed in presence of ganciclovir in the medium.Pyruvate kinasevi...

A vector derived from which one of the following viruses is used for high - frequency genomic integration of a transgene in animal cells?AdenoviruAdeno-associated virusLe...

Which one of the following statements about $Agrobacterium \;Ti\; plasmid$ is $CORRECT$?$Vir$ genes are located within the $T-DNA$ segmentPhytohormone biosynthesis genes ...

Which of the following types of molecules act as biological catalysts?Protein$RNA$Phospholipid$P$ and $Q$ only$P$ and $R$ only $Q$ and $R$ only$P, Q$ and $R$

Which one of the following media components is used to maintain $pH$ in mammalian cell culture?$CaCl_{2}$$MgSO_{4}$$NaCl$$NaHCO_{3}$

Which of the following are energy transducing membranes?Plasma membrane of bacteriaInner membrane of chloroplastsInner membrane of mitochondria$P$ and $Q$ only$P$ and $R$...

Amino acid sequences of cytochrome $c$ and ribulose $5$-phosphate epimerase from $40$ organisms were chosen and phylogenetic trees were obtained for each of these two pro...

A microorganism isolated from a salt-rich (salt concentration $\sim2$ $M$) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as t...

A function $f$ is as follows:$$f(x) = \begin{cases} 15 & \text{if }x<1 \\ cx& \text{if } x\geq 1 \end{cases}$$The function $f$ is a continuous function when $c$ is equal ...

Given that $Z=X^{2}+Y^{2}$, the value of $\dfrac{\partial Z}{\partial X}$ for $X=1$ and $Y=0$ is ________________ (answer is an integer).

The elemental composition of dry biomass of a yeast species is $CH_{1.6}O_{0.4}N_{0.2}S_{0.0024}P_{0.017}$. The contribution of carbon to the dry biomass is _________ $\%...

Solvents $A$ and $B$ are completely immiscible. Solute $S$ is soluble in both these solvents. $100\: g$ of $S$ was added to a container which has $2\: kg$ each of $A$ and...

The Bt toxin gene from $Bacillus\; thuringiensis$ used to generate genetically modified crops is$cry$$cro$$cdc$$cre$

Which one of the following is used as a $pH$ indicator in animal cell culture medium ?Acridine orange Phenol redBromophenol blueCoomassie blue

Tetracycline inhibits theinteraction between $tRNA$ and $mRNA$translocation of $mRNA$ through ribosomepeptidyl transferase activitybinding of amino-acyl $tRNA$ to ribosom...

Which one of the following is a database of protein sequence motifs?$PROSITE$$TrEMBL$$SWISSPROT$$PDB$

Which one of the following enzymes is encoded by human immunodeficiency virus $(HIV)$ genome?Reverse transcriptasePhospholipasePhosphatase$ATP$ synthase

$DNA$ synthesis in eukaryotes occurs during which phase of the mitotic cell cycle?$M$$G_{1}$$S$$G_{10}$

Match the human diseases in $Group\; I$ with the causative agents in $Group\; II$.$$\begin{array}&&\textbf{Group I} & \textbf{Group II} \\ &\text{P. Amoebiasis} & \text{...

Which one of the following techniques can be used to compare the expression of a large number of genes in two biological samples in a single experiment?Polymerase chain r...

Which of the following processes can increase genetic diversity of bacteria in nature?ConjugationTransformationTransductionTransfection$P$ only$P$ and $Q$ only$P, Q$ and ...

Which one of the following is $NOT$ a part of the human nonspecific defense system?InterferonMucousSalivaAntibody

A mutation in a gene that codes for a polypeptide results in a variant polypeptide that lacks the last three amino acids. What type of mutation is this?Synonymous mutatio...

Which one of the following equations represents a one-dimensional wave equation?$\dfrac{\partial u}{\partial t}=C^{2}\dfrac{\partial ^{2}u}{\partial x^{2}} \\$$\dfrac{\pa...

Which of the following are geometric series?$1,\:6,\:11,\:16,\:21,\:26,\:\dots$$9,\:6,\:3,\:0,\:-3,\:-6,\:\dots$$1,\:3,\:9,\:27,\:81,\:\dots$$4,\:-8,\:16,\:-32,\:64,\:\do...

Which one of the following statements is $CORRECT$ for enzyme catalyzed reactions? ( $\Delta G$ is Gibbs free energy change, $K_{eq}$ is equilibrium constant)Enzymes affe...

Which one of the following can NOT be a limiting substrate if Monod's growth kinetics is applicable?Extracellular carbon sourceExtracellular nitrogen sourceDissolved oxyg...

Which one of the following is the unit of heat transfer coefficient?$W\:m^{2}K^{-1}$$W\:m^{-2}K$$W\:m^{-2}K^{-1}$$W\:m^{2}K$

Which one of the following need NOT be conserved in a biochemical reaction?Total massTotal molesNumber of atoms of each elementTotal energy

The number of possible rooted trees in a phylogeny of three species is ______.

Matrix $A=\begin{bmatrix} 0&6 \\ p&0 \end{bmatrix}$ will be skew-symmetric when $p$= ____.

The fisherman, ________ the flood victims owed their lives, were rewarded by the government.whomto whichto whomthat

Some students were not involved in the strike.If the above statement is true, which of the following conclusions is/are logically necessary?Some who were involved in the ...

The radius as well as the height of a circular cone increases by $10\%.$ The percentage increase in its volume is ________.$17.1$$21.0$$33.1$$72.8$

Five numbers $10,7,5,4$ and $2$ are to be arranged in a sequence from left to right following the directions given below:No two odd or even numbers are next to each other...