List of top Life Science Questions

Intracellular concentrations of ATP, ADP, and inorganic phosphate in four cell types are given below. Which one of these cell types has the most negative \(\Delta G\) for ATP hydrolysis? 

Cell typeATP (mM)ADP (mM)Inorganic phosphate (mM)
L3.01.85.0
K3.91.33.0
B2.70.72.7
M7.20.98.0

Match the coordination complexes given in Column I with the most appropriate properties in Column II. (Given: Atomic numbers of Mn: 25; Co: 27; Ni: 28) 

A mixture of four peptides, PKKRK, RGERV, RYRGV and LVVYP, is loaded onto an ion-exchange column at pH = 7.2. If carboxymethyl (CM) cellulose is used as the stationary phase of this column, then which peptide elutes first? 

Suitable reagent(s) to bring about the conversion of P to Q in good yield is/are 

What is the major product formed in the given reaction? 

An opaque cylinder (shown below) is suspended in the path of a parallel beam of light, such that its shadow is cast on a screen oriented perpendicular to the direction of the light beam. The cylinder can be reoriented in any direction within the light beam. Under these conditions, which one of the shadows P, Q, R, and S is NOT possible?

Which one of the given figures P, Q, R, and S represents the graph of the following function? \[ f(x) = |x + 2| - |x - 1| \]

\(E^\circ = 1.10\ \text{V}\) for the cell: \(\mathrm{Zn(s) + Cu^{2+}(aq) \rightleftharpoons Zn^{2+}(aq) + Cu(s)}\). At \(298\ \text{K}\), the equilibrium constant is \(y \times 10^{37}\). Find \(y\) (to two decimals). (Given: \(F = 96485\ \text{C mol}^{-1}\), \(R = 8.314\ \text{J K}^{-1}\text{mol}^{-1}\)).
A sample of glucose isomerase enzyme converts 15 \(\mu\)moles of substrate glucose into fructose per min per mL under standard assay conditions. The enzyme activity in International Unit (IU) is ................ (in integer).
Identify the correct statement(s) related to grain polysaccharides among the following.
Choose the correct statement(s) about the enzyme and its application in food processing reaction.
Identify the Gram +ve bacteria responsible for causing food borne diseases among the followings.
Orange juice stored under ambient conditions shows vitamin C degradation following first-order kinetics with degradation constant \(k = 5.2 \times 10^{-3} \ \text{day}^{-1}\). What is the half-life of vitamin C in days (integer)?
Calculate the efficiency in percent (rounded off to 1 decimal place) of an oil expeller which yields 37 kg oil containing 5% solid impurities from 100 kg mustard seeds. The oil content of the mustard seed is 38%.
Which among the following statements is NOT correct?
The time required for stipulated destruction of a microbial population at a given temperature is
Some of the industrial products are produced by fermentation processes. Identify the correct pair of product and fermentative microorganism.
The weight of 10 kg dried cauliflower containing 5% moisture (wet basis) after rehydration is 60 kg. If the fresh cauliflower contained 87% moisture (wet basis), calculate the coefficient of rehydration (rounded off to 2 decimal places).
Which among the following is NOT an essential amino acid?
Wild-type Drosophila females having three linked genes (AABBCC) were crossed with triple recessive mutant (aabbcc) males. The F1 females (AaBbCc) were backcrossed with aabbcc males. The following F2 progeny numbers were obtained (total = 1000). The gene order is ABC. Find the recombination map distance (in cM) between A and C (round to one decimal place). \begin{tabular}{l r} AaBbCc & 241
Aabbcc & 112
aaBbCc & 103
aabbcc & 252
aaBbcc & 17
aabbCc & 134
AabbCc & 14
AaBbcc & 127
\end{tabular}
Choose the correct group of fat soluble vitamins.
The synthesis of thyroxine T4 in the human body requires
Which of the following statements is/are TRUE for Colchicine?
In an experiment, excess amount of bicoid mRNA (more than wild-type expression level) was injected into the posterior pole of a wild-type Drosophila embryo at pre-blastodermal stage. Out of the following options, which one represents the best expected phenotype in the resulted developing embryo?
Which of the following techniques is/are used for determining the three-dimensional structure of proteins?