Recent questions tagged gate2017

An enzyme catalyzes a reaction bydecreasing the energy of the substrate.decreasing the activation energy of the reaction.decreasing product stability.increasing the activ...

Natural proteins are composed primarily of $20$ $\alpha$-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH $1.5$...

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

The surface area (in $m^2$) of the largest sphere that can fit into a hollow cube with edges of length $1$ meter is ______Given data: $\pi=3.14$

In a thin layer chromatography experiment using a silica gel plate, a compound showed migration of $12.5$ cm and the solvent front showed migration of $18$ cm. The $R_f$ ...

$\underset{x \to 0}{\lim} \dfrac{\sin(x)}{x}$ is ________

Which one of the following mechanisms is used by human pathogens to evade host immune responses?Somatic hypermutationAntibody productionAntigenic variationComplement acti...

If the nucleotide composition $(\%)$ of a viral genome is $A = 10$, $U = 20$, $C = 40$, and $G = 30$, which one of the following is this genome?Double stranded RNASingle ...

Which one of the following techniques can be used to determine the structure of a $15$ kDa globular protein at atomic resolution?Raman spectroscopyIR spectroscopyUV spect...

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...

The plant hormone indole-$3$-acetic acid is derived fromhistidinetyrosinetryptophanproline

Enzyme-linked immunosorbent assay (ELISA) is used forquantifying antibody levels in blooddetermining the molecular weight of an antigenpurifying proteins from biological ...

Macrophages eliminate pathogenic bacteria upon activation byNK cellsbasophilsCD$4+$ T cellsplasma cells

If a protein contains four cysteine residues, the number of different ways they can simultaneously form two intra-molecular disulphide bonds is __________.

Secretory proteins synthesized by ER-associated ribosomes traverse throughmitochondriaperoxisomesthe Golgi apparatusthe nucleus

For $y=f(x)$, if $\dfrac{d^2y}{dx^2}=0$, $\dfrac{dy}{dx}=0$ at $x=0$, and $y=1$ at $x=1$, the value of $y$ at $x=2$ is __________

During protein synthesis, tRNAs are NOT involved incharginginitiationelongationtermination

In eukaryotes, cytokinesis is inhibited bycytochalasin Dvinblastinenocodazolecolchicine

A proto-oncogene is suspected to have undergone duplication in a certain type of cancer. Of the following techniques, which one would verify the gene duplication?Northern...

A polymerase chain reaction (PCR) was set up with the following reagents: DNA template, Taq polymerase, buffer, dNTPs, and Mg$^{2+}$. Which one of the following is missin...

An enzymatic reaction exhibits Michaelis-Menten kinetics. For this reaction, on doubling the concentration of enzyme while maintaining $[S]>>[E_0]$both $K_m$ and $V_{\tex...

A $5$ liter chemostat is fed fresh medium at $0.2$ liters/minute having a substrate concentration of $25$ grams/liter. At steady state, the outgoing stream has substrate ...

The transcription factor $X$ binds a $10$ base pair DNA stretch. In the DNA of an organism, $X$ was found to bind at $20$ distinct sites. An analysis of these $20$ bindin...

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 ...

At the transcription start site of a gene, any of the four nucleotides can occur with equal probability $p$. The Shannon Entropy $S$, given by $S= – \Sigma_{i=1}^4 p_i \l...

Which one of the following graphs represents the kinetics of protein precipitation by addition of ammonium sulphate? On the $Y$-axis, [Protein] represents the concentrati...

The distribution of marks scored by a large class in an exam can be represented as a normal distribution with mean $\mu$ and standard deviation $\sigma$. In a follow-up e...

The angle (in degrees) between the vectors $\overrightarrow{x}= \hat{i}-\hat{j}+2 \hat{k}$ and $\overrightarrow{y} = 2 \hat{i} – \hat{j}-1.5 \hat{k}$ is _________

Match the proteins in $\textbf{Group I}$ with cellular processes in $\textbf{Group II}$$\begin{array}{|l|l|l|l|} \hline & \textbf{Group I} & & \text{Group II} \\ \hline P...

The circular dichroism spectra of three proteins $P$, $Q$, and $R$ are given below:Choose the correct combination.$P: \alpha- \text{helix}, Q: \beta- \text{sheet}, \text{...

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} \\ \hli...

Which one of the following amino acids has three ionizable groups?GlycineLeucineValineLysine

Consider an infinite number of cylinders. The first cylinder has a radius of $1$ meter and height of $1$ meter. The second one has a radius of $0.5$ meter and height of $...

The concentration (in micromolar) of NADH in a solution with $A_{340}=0.50$ is _________Given data: Path length $=1$ cm; Molar extinction coefficient of NADH $\varepsilon...

The specific activity of an enzyme in a crude extract of $\textit{E.coli}$ is $9.5$ units/mg of protein. The specific activity increased to $68$ units/mg of protein upon ...

Which one of the following organisms is responsible for crown gall disease in plants?$\textit{Xanthomonas campestris}$$\textit{Rhizobium etli}$$\textit{Agrobacterium tume...

Match the plant hormones in $\textbf{Column I}$ with functions in $\textbf{Column II}$$\begin{array}{|l|l|l|l|} \hline & \textbf{Column I} && \text{Column II} \\ \hline ...

For an $\textit{E.coli}$ culture in the exponential phase of growth, optical density (OD) at $540$ nm is $0.3$ at $2$ hours and $0.6$ at $4$ hours. Assuming that the meas...

An immunocompetent person becomes infected with a pathogenic strain of bacteria. Which one of the following graphs correctly depicts bacterial load in this person over ti...

The genome is diploid at the end of which phases of a human mitotic cell cycle?$\text{G2 & S}$$\text{G1 & M}$$\text{M & S}$$\text{G1 & G2}$