Test: Question bank (Entrance examination to PG courses)
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Keywords: GATE, CSIR, UGC, NET, Biology, Biochemistry, Biotechnology
A family has 5 daughters probability of 6th child being girl will be
The probability of production of sperm cells containing a Y chromosome is same as the probability of production of sperm cells containing X chromosome. Hence the chance of the resulting zygote being XX or female is always 1 in 2.
1 in 2
1 in 5
1 in 3
1 in 6
An anaerobic organism that can only survive in parasitizing the host is known as
An obligate parasite is a parasitic organism that cannot live independently of its host.
A Ketogenic aminoacid among the following is
A ketogenic amino acid is an amino acid that can be converted into ketone bodies through ketogenesis. This is in contrast to the glucogenic amino acids, which are converted into glucose. In humans, two amino acids are exclusively ketogenic: leucine and lysine.
The base present in Lecithin is
Phosphatidylcholine or lecithin has choline as nitrogenous base and it belongs to the family of phospholipids.
The cytochrome participating in bacterial photosynthesis are
Virus that affects E. coli is called
Bacteriophages are the viruses which attack bacteria.
The first enzyme that reduces Nitrates to Nitrite and Ammonia in Plants is
The technique of recombinant DNA first became available
Paul Berg and Herb Boyer produced the first recombinant DNA molecules in 1972.
A double bond consists of
A double bond consists of a sigma bond (using hybrid orbitals) and a pi bond (using p orbitals).
Two alpha bonds
Two pi bonds
One alpha and one pi bond
A monocentric chromosome with a central centromere is known as
Metacentric chromosomes have their centromere located exactly in the centre and the two arms are of the same length. Such a chromosome assumes the shape of 'V' during anaphase.
In blue green Algae the Photosystem Il contains an important pigment concerned with
Photosystem II (or water-plastoquinone oxidoreductase) is located in the thylakoid membrane of plants, algae, and cyanobacteria and is involved in Light-dependent reactions. It contains 12 beta-carotene units.
The first stable organic product of Carbon fixation in Photosynthesis is
The term to define gene as a unit of genetic function a region of DNA which encodes a specific product is known as
A cistron is a term used to describe the locus responsible for generating a protein. It can also be defined as the segment of DNA that contains all the information for production of a single polypeptide.
The protein sequence database is
SWISS-PROT is a curated protein sequence database.
Denitrification is carried out under the influence of Microorganisms such as
Denitrifying bacteria reduce nitrates or nitrites to nitrogen-containing gases. Potential examples include Thiobacillus denitrificans, Micrococcus denitrificans/ Paraoccus denitrificans and Pseudomonas.
The Enzyme Nitrilase convert
Nitrilase enzymes catalyses the hydrolysis of nitriles to carboxylic acids and ammonia, without the formation of "free" amide intermediates. Nitrilases are involved in natural product biosynthesis and post translational modifications in plants, animals, fungi and certain prokaryotes.
lndole acetonitrile to IAA
IAA to Indole acetonitrile
Indole pyruvic acid to IAA
Tryptamine to IAA
The lack of pigmentation is called albinism, it is due to a recessive allele ‘a`. Two normal parents have albino child. What will be the probability of the next child will be albino?
Which one of the following methods is the best to separate enzymes?
Affinity Chromatography exploits the capacity of biomolecules for specific, noncovalent binding of other molecules called ligands. Ex: Enzyme and ligands, Hormones and receptors etc.
Ion Exchange Chromatography
A small insertion or deletion of 3n + - l nucleotides which disrupts the reading frame, generating a novel polypeptide sequence distal to the mutation is known as
Read through mutation
An interacalating dye used to detect nucleic acid when viewed under UV light
Ethidium bromide is an intercalating agent commonly used as a fluorescent tag (nucleic acid stain) in molecular biology laboratories for techniques such as agarose gel electrophoresis.