List of top Life Science Questions

Benzoic acid or benzoates are used to preserve food from
A. Insects
B. Yeast
C. Clostridia
D. Molds
Choose the correct answer from the options given below:
The Bdellovibrios bacteria is a _________ bacteria:
A. Gram negative
B. Predator of gram negative bacteria
C. It has a single polar flagellum
D. Reproduce by producing spores called myxospore during nutrient deficit conditions
Choose the correct answer from the options given below:
Organisms belongs to the genus bacteroides are:
Which of the following amino acids are essential amino acids in humans:
A. Leucine
B. Lysine
C. Isoleucine
D. Serine
Choose the correct answer from the options given below:
The glycosidic bond between the monomers of sucrose is-
Match LIST-I with LIST-II
Choose the correct answer from the options given below:
Match LIST-I with LIST-II
Choose the correct answer from the options given below:
Arrange the steps of recombinant DNA-cloning procedure in correct sequence of their occurance:
A. Joining the target DNA with cloning vector DNA by ligase enzyme.
B. Targeted DNA from a source organism is cleaved and cloning vector DNA is also cleaved by the same restriction endonuclease.
C. Selection of transformants from non-transformants through antibiotic resistance and color indicators
D. Introduction of recombinant DNA into host cell.
Choose the correct answer from the options given below:
Which one of the following statement is incorrect regarding the work of Erwin Chargaff?
Which of the following molecule/ion is not transported/buffered by hemoglobin?
Match the LIST-I with LIST-II
Choose the correct answer from the options given below:
In humans, one of the most recognized satellite DNA sequences, found mainly in the centromere region is:
Telomerase acts as a cellular reverse transcriptase that provides the active site for:
Which of the following pair of class and organism is not correctly matched?
Select correct statement about Euchromatin :
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?
The DNA of the bacterial cell is protected from the cell's own restriction enzymes by the addition of methyl group (-CH3) to ___________ of cytosine.
A. 4th Carbon
B. 7th Carbon
C. 6th Carbon
D. 5th Carbon
Choose the correct answer from the options given below:
A technique for transferring denatured DNA molecules that have been separated electrophoretically from a gel to a matrix (such as a nitrocellulose or nylon membrane) on which a hybridization assay can be performed is called
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.
Choose the correct answer from the options given below:
Which of the following are the types of column chromatography?
A. Paper chromatography
B. Affinity chromatography
C. Size exclusion chromatography
D. Ion-exchange chromatography
Choose the correct answer from the options given below:
Tryptophan, tyrosine and phenylalanine, absorb ultraviolet light. Therefore, the protein rich in these amino acids strongly absorbs the light of wavelength ___________ due to aromatic side chain of these amino acids.
Which of the following is not true about gel electrophoresis?
Which of the following will be the part of the pellet, when tissue cells are homogenized and centrifuged at 1000g for 10 min.?
Arrange the following DNA fragments A, B, C, D separated after Gel Electrophoresis in increasing order of number of their base pairs
To observe the specific part of a tissue section under compound microscope, the contrast can be increased by: