Recent questions tagged microbiology

In nitrogen fixation, to reduce nitrogen to ammonia, which one of the following shows the correct order of electron flow?Ferredoxin → reductase → nitrogenaseNADH → reduct...

Which one of the following antibiotics blocks protein chain elongation by preventing the action of peptidyl transferase?BleomycinRifampicinChloramphenicolTetracycline

The RNA primer synthesized during bacterial DNA replication is removed by $\_\_\_\_$.DNA gyraseDNA Polymerase $\text{I}$PrimaseDNA Polymerase $\text{III}$

The correct sequence of the four steps involved in anaerobic production of biogas from complex organics is:Hydrolysis → Acidogenesis → Acetogenesis → MethanogenesisMethan...

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...

A microbial culture is being grown in a bioreactor with continuous aeration. The dissolved oxygen probe provided with the system shows a reading of zero. In this context,...

A batch sterilizer is being operated at $121^{\circ} \mathrm{C}$ for sterilizing a medium containing microbial cells. Assume that the thermal deactivation of cells is a f...

A microbe that follows Monod growth kinetics on a limiting substrate (maximum specific growth rate of $0.5 \mathrm{~h}^{-1}$ and Monod constant of $0.1 ~\mathrm{mg} \math...

It is desired to cultivate $150$ mg (dry weight) microbial cells with an empirical formula of $\mathrm{C}_{5} \mathrm{H}_{7} \mathrm{O}_{2} \mathrm{~N}$. If the phosphoru...

​​​​Which of the following features is/are used to distinguish Archaea from Bacteria?Gram-stainingPeptidoglycan in the cell wallPresence of N -acetylglucosamine$16 S$ rRN...

Which of the following factors can affect the growth of a microbial culture in a batch cultivation process?$\mathrm{pH}$ of the medium Osmolarity of the mediumSubstrate c...

Under complete cell washout condition in a chemostat with sterile feed, which of the following statements is/are correct?Biomass concentration in the reactor is maximumS...

Aspergillus niger is grown in a $10,000$ L stirred batch bioreactor under aerated conditions to produce citric acid. At steady state oxygen transfer conditions, the speci...

Which one of the following statements is TRUE about leghemoglobin?It binds oxygen to protect nitrogenaseIt binds hemoglobin to protect oxygenaseIt binds oxygen to protect...

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...

E. coli cultivated at $298 \mathrm{~K}$ uptakes an uncharged compound (A) by passive diffusion. The intracellular and extracellular concentrations of $\mathrm{A}$ are $0...

The following schematic diagram shows a chemostat with cell recyclewhere $\mathrm{F}_0$ and $\mathrm{F}_{\mathrm{r}}$ are the volumetric flow rates (in $L \cdot h^{-1}$ )...

Match the media component (Column I) with its role (Column II).$$\begin{array} {ll} \textbf{Column I} & \textbf{Column I} \\ \text{P. Sucrose} & \text{1. Anti-foam agen...

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

The type of nucleic acid present in $\lambda$-phage isDouble stranded $\text{DNA}$Single stranded circular $\text{DNA}$Single stranded $\text{DNA}$Single stranded $\text{...

Match the microbial product (Column I) with its respective application (Column II).$$\begin{array} {lll} \textbf{Column I} & & \textbf{Column II} \\ \text{P. Methane} & &...

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...

Which of the following statement(s) is(are) CORRECT regarding the $lac$ operon in $E. coli$ when grown in the presence of glucose and lactose?At low glucose level, the op...

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 ...