Feat Coaching - Entrance Exam

An amino acid has one proton donating group in the side chain. The pK1, pK2, and pK3 values for this amino acids are 2.19,9.67 and 4.25 respectively. Which one of the following statements about this amino acids are correct ?

• Majority of the Molecules will have net charge of -1 at pH of 7.0

• Majority of the Molecules will have net charge of 0 at pH of 4.25

• All the molecules will have deprotonated R group at pH of 2.77

• During titration with a strong base, deprotonation will sart with the R group

Formation of retinoblastoma eye tumor requires

• A germinal mutation in one RB allele, then a somatic mutation in the other allele

• A somatic mutation that turns on the RB gene

• A germinal mutation in one RB allele

• A germinal mutation in the dominant RB allele

which of the following does not participate in the formation of Antigen - Antibody complexes ?

• Hydrophobic bonds

• covalent bonds

• electrostatic interactions

• Vanderwalls forces

The climax plants in a desert would be expected to have the following adaptations

• large number of stomata on the upper leaf surface

• dull leaves and thin epidermis

• Reduced leaf surface with deep roots

• broad leaves and shallow root

In a diploid organism, what is the maximum number of alleles that can exist in a population for any given gene

• 1

• 2

• 4

• unlimited

In a Population that is in equilibrium, the proportion of individuals showing the dominant trait at a given locus having two alleles is 84%. The frequency of the recessive allele in the population is

• 0.40

• 0.30

• 0.20

• 0.16

restriction endonucleases from two different organism that recognize the sae DNA sequence for cleavage are called

• Isochizomers

• neoschizomer

• concatemers

• palindromes

Green fluorescent protein (GFP) from jelly fish has wide application in biological research. the fluorescence emitted by GFP is due to

• presence of two zinc ions in GFP molecule

• heme, that serves as a prosthetic group in GFP molecule

• Three amino acids residues within GFP molecule

• presence of Chromobilin molecule

In a Callus culture

• increasing level of cytokinin to a callus induces shoot formation and increasing level of auxin promotes root formation

• Increasing level of auxin to a callus induces shoot formation and increasing level of cytokinin promotes root formation

• Auxins and cytokinins are not required

• only auxin is required for root and shoot formation

An ideal cybrid should have

• Both Nuclear genome and cytoplasmic genome equally from both the parents

• Nuclear genome from one of the parents and cytoplasmic genome from other parent

• Nuclear genome predominantly/ exclusively from one of the parents and cytoplasmic genome equally from both the parents

• nuclear genome equally from both the parents and cytoplasmic genome predominantly / exclusively from one of the parents