Recent questions in General Biology

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...

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

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

Bacteria with two or more flagella at one or both ends are calledamphitrichousperitrichouslophotrichousatrichous

Which family of viruses has single stranded DNA?HerpesviridaePoxviridaeRetroviridaeParvoviridae

What will be the binding status of regulatory proteins in lac operon when concentrations of both lactose and glucose are very low in the culture medium?Only the repressor...

Which of the following are TRUE for Treponema pallidum?It is the causative agent of syphilisIt is a spirocheteIt is a non-motile bacteriumIt is generally susceptible to p...

In a typical mitotic cell division cycle in eukaryotes, $M$ phase occurs immediately after the$G_0$ phase$S$ phase$G_1$ phase$G_2$ phase

ATP biosynthesis takes place utilizing the $H^+$ gradient in mitochondria and chloroplasts. Identify the correct sites of $H^+$ gradient formation.Across the outer membra...

Which one of the following is NOT an algorithm for building phylogenetic trees?Maximum parsimonyNeighbor joiningMaximum likelihoodBootstrap

Cesium chloride density gradient centrifugation is commonly used for the separation of DNA molecules. The buoyant density, $\rho$ of a double stranded $Cs^+DNA$ is given ...

Disaccharide molecules that contain $\beta( 1 –\blacktriangleright 4)$ glycosidic linkage aresucrose and maltosesucrose and isomaltosemaltose and isomaltoselactose and ce...

Junctional diversity of antibody molecules results fromthe addition of switch region nucleotidesthe addition of N and P nucleotidesthe joining of V, D and J segmentsmutat...

Which one of the following techniques relies on the spin angular momentum of a photon?CD spectroscopyFluorescence spectroscopyIR spectroscopyRaman spectroscopy

Which one of the following statements is NOT true?In competitive inhibition, substrate and inhibitor compete for the same active site of an enzymeAddition of a large amou...

Based on their function, find the ODD one out.miRNAsiRNAshRNAsnRNA

Which combination of the following statements is CORRECT for cyanobacteria?They can perform oxygenic photosynthesisUsually filamentous forms are involved in nitrogen fixa...

Which set of the following events occurs during the elongation step of translation?Attachment of mRNA with the smaller subunit of ribosomeLoading of correct aminoacyl-tRN...

A DNA sequence, $\textrm{5’ -ATGGACGTGCTTCCCAAAGCATCGGGC- 3’}$, is mutated to obtain$\textrm{5'-ATGGACGTGCTTC}\textbf{a}\textrm{CAAAGCATCGGGC- 3'}$$\textrm{5'-ATGGACGTGCT...

Which of the following events occur during the stationary phase of bacterial growth?Rise in cell number stopsSpore formation in some Gram-positive bacteria such as Bacill...

A variety of genetic elements are used in the transgenic plant research. Match the genetic elements (Column-I) with their corresponding source (Column-ll).$\begin{array}{...

The equilibrium potential of a biological membrane for $Na^+$ is $55$ mV at $37^\circ$ C. Concentration of $Na^+$ inside the cell is $20$ mM. Assuming the membrane is per...

Find the INCORRECT combinationSurface immunoglobulins – B cell antigen receptorAffinity maturation - isotype switchingFc region of antibodies – binding to complement prot...

Which of the following statement(s) is/are CORRECT for antigen activated effector T cells?$CD4^+$ cells make contact with macrophages and stimulate their microbicidal act...

Which one of the following statements regarding G proteins is INCORRECT?GDP is bound to G protein in the resting stageGTP bound $\alpha$ subunit cannot reassemble with $\...

In an assay of the type II dehydroquinase of molecular mass $18$ kDa, it is found that the $V_{\text{max}}$ of the enzyme is $0.0134 \: \mu \text{ mol} \cdot \text{min}^{...

The molar extinction coeffcients of Trp and Tyr at $280$ nm are $5690$ and $1280 \: M^{-1} \cdot cm^{-1}$, respectively. The polypeptide chain of yeast alcohol dehydrogen...

The activity of lactate dehydrogenase can be measured by monitoring the following reaction: $$\text{Pyruvate} + \text{NADH} \rightarrow \text{Lactate} + \text{NAD}^+$$ Th...

Analysis of a hexapeptide using enzymatic cleavage reveals the following result:Amino acid composition of the peptide is: $2R, A, V, S, Y$Trypsin digestion yields two fra...

A protein is to be purified using ion-exchange column chromatography. The relationship between HETP (Height Equivalent to Theoretical Plate) and the linear liquid velocit...