Recent questions and answers in Microbiology

To determine the viable cell count of a bacterial culture, you have plated $50 ~\mu \mathrm{~L}$ of a $100$ -fold diluted sample of the culture on a nutrient agar plate a...

Match the type of bacteria in Group I with their respective growth properties in Group II.Group IGroup IIP. Halophile1. Grows optimally between $20^{\circ} \mathrm{C}$ an...

Match the virus in Group I with the type of genome it contains in Group II.Group IGroup IIP. T4 bacteriophage1. dsRNAQ. SARS-CoV-22. ssDNAR. Pseudomonas phage $\phi 6$3. ...

Which of the following statement(s) is(are) TRUE about fluoroquinolone drugs?They contain quinolone ring(s)They inhibit RNA polymeraseThey bind to bacterial topoisomerase...

In binomial nomenclature, the name of a bacterial strain is written with the first letter of __________ word(s) being capitalized.firstsecondneitherfirst and second

Which of the following is(are) $\text{COMMON}$ feature(s) for both aerobic and anaerobic bacterial cultures?Glycolysis$\text{NAD}^{+}$ is the oxidising agentOxidative pho...

Emerging viruses such as $\text{SARS-Co V2}$ cause epidemics. Which of the following process(es) contribute to the rise of such viruses?Mutation of existing virusJumping ...

A bacterial strain is grown in nutrient medium at $37^{\circ}\text{C}$ under aerobic conditions. The medium is inoculated with $10^{2}$ cells from a seed culture. If the ...

Coronavirus genome consists ofdouble-stranded $\text{DNA}$double-stranded $\text{RNA}$negative-sense single-stranded $\text{RNA}$positive-sense single-stranded $\text{RNA...

Which one of the following is $\text{CORRECT}$ about microbial growth medium?Luria-Bertani broth is a synthetic mediumNutrient broth is a defined mediumSabouraud dextrose...

Decimal reduction time of a bacterial strain is $20 \textit{ min}$. Specific death rate constant in $\textit{min}^{-1}$ (rounded off to two decimal places) is ___________

Which of the following antimicrobial agent(s) is/are growth factor analog(s)?$5$-FluorouracilIsoniazidSulfanilamideTetracycline

A $0.1 \textit{ mL}$ aliquot of a bacteriophage stock having a concentration of $4 \times 10^9 \textit{ phages mL}^{-1}$ is added to $0.5 \textit{ mL}$ of $\textit{E. col...

Carl Woese used the gene sequence of which one of the following for phylogenetic taxonomy of prokaryotes?A ribosomal $RNA$ of large ribosomal subunitA ribosomal $RNA$ of...

A list of pathogens $(Group\; I)$ and a list of anti-microbial agents $(Group\; II)$ used to treat their infections are given below. Match the pathogens with the correspo...

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

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 ...

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

Which family of viruses has single stranded DNA?HerpesviridaePoxviridaeRetroviridaeParvoviridae

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...

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

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...

Which one of the following organisms is an indicator of fecal contamination?$\textit{Escherichia coli}$$\textit{Streptococcus lactis}$$\textit{Bacillus subtilis}$$\textit...

Assertion [a]: Gram negative bacteria show staining with saffranin.Reason [r]: Gram negative bacteria have an outer membrane with lipopolysaccharides.Both [a] and [r] are...

A bacterium has a genome of size $6$ million base pairs. If the average rate of DNA synthesis is $1000$ base pairs/second, the time taken (in minutes) for replication of ...

One hunderd E.coli cells are each infected by a single $\lambda$ phage particle. The ratio of the number of phage particles committing to lysogeny to those committing to ...

Which one of the following organisms is used for the determination of phenol coefficient of a disinfectant?Salmonella typhiEscherichia coliCandida albicansBacillus psychr...