List of top Life Science Questions

A scientist wants to separate three protein molecules by ion-exchange chromatography. The pH of the mobile phase of the column is maintained in such a way that the protein molecule (A) has a net charge of -2, protein molecule (B) has a net charge of +2 and protein molecule (C) has a net charge of +1. Which one of the molecule/s will elute first from a cation-exchange resin?
Which of the following amino acids are essential amino acids in humans:
A. Leucine
B. Lysine
C. Isoleucine
D. Serine
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Match LIST-I with LIST-II
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Which of the following is not true about gel electrophoresis?
The glycosidic bond between the monomers of sucrose is-
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The cationic antimicrobial peptide, histatin is found in human's_____________.
Which one of the following acid is hydrophobic with non polar side chain?
More recently discovered plant hormone, Jasmonates, play an important role both in plant defense and development, is derived from which fatty acid?
Which one of the following amino acids is involved in synthesis of hormone epinephrine in humans?
The membrane potential of a resting neuron is:
Among the following species of bryophytes, which is not an example of mosses?
Which of the following statements are correct regarding prokaryotic genomic organization?
A. Most prokaryotes contain a single large circle of double stranded DNA as its genome.
B. The nucleoid is an irregularly shaped region that contains the cell's chromosome and numerous proteins.
C. Nucleoid associated proteins (NAPs) are not particularly important during cell division for the compaction of chromosome.
D. Prokaryotic genomes are much smaller as compared to eukaryotes.
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Typhoid Vi antigen type of vaccine is:
Which of the following are autosomal recessive genetic disorder?
A. Huntington disease
B. Sickle cell anemia
C. Lesch-Nyhan syndrome
D. Tay-Sachs disease
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Which one of the following proteins is often referred to as "the guardian of the genome"?
The plants bloom when the light duration is less than 12 hours per day are know as.
Who among the following is known as the father of Indian paleobotany?
In homosporous pteridophyte species, the development of gametophyte is
The Ti plasmid and its T-DNA have been genetically modified for use as a vector for the insertion of recombinant DNA into plant chromosomes to prevent dicots from tumor diseases. The source of Ti plasmid is:
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Imagine a population of diploid species in Hardy-Weinberg equilibrium. The population has two alleles for a gene which are ‘a’ and ‘A’. The number of individuals with ‘aa’ genotype in this population is 1 in 10000. The frequency of the allele ‘A’ in the population is ............ (up to two decimal places)
The \( F_{121} \) value of a known microorganism with \( Z \) value of \( 11^\circ C \) is 2.4 min for 99.9999% inactivation. For a 12D inactivation of the said microorganism at \( 143^\circ C \), the \( F \) value (in min) is .......... {(rounded off to 3 decimal places)}
In a typical grinding operation, 80% of the feed material passes through a sieve opening of 4.75 mm; whereas, 80% of the ground product passes through 0.5 mm opening. If the power required to grind 2 tonnes/h of the feed material is 3.8 kW, the work index of the material is ........ (rounded off to 2 decimal places)
The true density and bulk density of wheat grains are 1280 kg/m\(^3\) and 740 kg/m\(^3\), respectively. The porosity of the grains is ......... (rounded off to 2 decimal places).