GATE Overflow for GATE BT - Recent questions and answers in Microbes

GATE BT 2025 | Question: 11

Thu, 06 Mar 2025 17:05:56 +0000

Which of the following features is/are used to distinguish Archaea from Bacteria?

Gram-staining
Peptidoglycan in the cell wall
Presence of N -acetylglucosamine
$16 S$ rRNA sequences

GATE BT 2024 | Question: 42

Mon, 25 Mar 2024 19:16:14 +0000

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 medium
Substrate concentration in the medium
Substrate feed rate

GATE BT 2022 | Question: 13

Sun, 20 Mar 2022 16:16:29 +0000

Match the microbial product (Column I) with its respective application (Column II).

$$\begin{array} {lll} \textbf{Column I} & & \textbf{Column II} \\ \text{P. Methane} & & \text{1. Biosurfactant} \\ \text{Q. Glycolipids} & & \text{2. Bioplastic} \\ \text{R. Polyhydroxy alkanoate} & & \text{3. Biofuel} \end{array}$$

$\text{P-1, Q-2, R-3}$
$\text{P-2, Q-1, R-3}$
$\text{P-3, Q-2, R-1}$
$\text{P-3, Q-1, R-2}$

GATE2019: 40

Tue, 03 Nov 2020 12:03:21 +0000

Which of the following factors can influence the lag phase of a microbial culture in a batch fermentor?

Inoculum size
Inoculum age
Medium composition

$P$ and $Q$ only
$Q$ and $R$ only
$P$ and $R$ only
$P, Q$ and $R$

GATE2020: 16

Tue, 03 Nov 2020 11:02:13 +0000

A microorganism isolated from a salt-rich (salt concentration $\sim2$ $M$) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as the major lipid component of its cell membrane. The isolated organism is

a planctomycete
a cyanobacteria
a unicellular amoeba
an archaea

GATE2016-18

Mon, 26 Mar 2018 16:59:51 +0000

A biological process is involved in the __________ treatment of industrial effluent.

primary
secondary
tertiary
quaternary

GATE BT 2017 | Question: 31

Mon, 26 Mar 2018 16:43:18 +0000

Match the organisms in $\text{Column I}$ with the characteristics in $\text{Column II}$:

$\begin{array}{|l|l|l|l|} \hline & \textbf{Column I} && \textbf{Column II} \\ \hline P. & \textit{Methanococcus} & 1. & \text{Halophile} \\ \hline Q. & \textit{Dunaliella} & 2. & \text{Acidophile} \\ \hline R. & \textit{Sulfolobus} & 3. & \text{Mesophile} \\ \hline S. & \textit{Escherichia} & 4. & \text{Barophile} \\ \hline \end{array}$

$\text{P-4, Q-3, R-2, S-1}$
$\text{P-3, Q-2, R-4, S-1}$
$\text{P-2, Q-1, R-4, S-3}$
$\text{P-4, Q-1, R-2, S-3}$

GATE BT 2017 | Question: 48

Mon, 26 Mar 2018 16:43:15 +0000

Growth of a microbe in a test tube is modeled as $\dfrac{dX}{dt} = rX \bigg (1 – \dfrac{X}{K}\bigg )$, where, $X$ is the biomass, $r$ is the growth rate, and $K$ is the carrying capacity of the environment $(r \neq O; K \neq 0)$. If the value of starting biomass is $\dfrac{K}{100}$, which one of the following graphs qualitatively represents the growth dynamics?

GATE BT 2015 | Question: 27

Mon, 26 Mar 2018 15:10:48 +0000

Which one of the following relations holds true for the specific growth rate $(\mu)$ of a microorganism in the death phase?

$\mu=0$
$\mu<0$
$\mu=\mu_{\text{max}}$
$0<\mu<\mu_{\text{max}}$

GATE BT 2015 | Question: 45

Mon, 26 Mar 2018 15:10:45 +0000

Match the microorganism in $\text{Group I}$ with their fermentation products in $\text{Group II}$.

$\begin{array}{|l|l|l|l|} \hline & \textbf{Group I} && \textbf{Group II} \\ \hline P. & \textit{Leuconostoc mesenteroides} & 1 .& \text{Cobalamin} \\ \hline Q. & \textit{Rhizopus oryzae} & 2. & \text{Sorbose} \\ \hline R. & \textit{Gluconobacter suboxydans} & 3. & \text{Dextran} \\ \hline S. & \textit{Streptomyces olivaceus} & 4. & \text{Lactic acid} \\ \hline && 5. & \text{Butanol} \\ \hline \end{array}$

$\text{P-5, Q-4, R-2, S-1}$
$\text{P-5, Q-3, R-2, S-4}$
$\text{P-3, Q-4, R-1, S-2}$
$\text{P-3, Q-4, R-2, S-1}$