List of top Life Science Questions

A rock body through which ground water flows is called
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:
The left-handed helix, Z-DNA is 18 \AA \ (1.8 nm) in diameter which contains _____________________.
Which of the given factors can affect frequency in Mendelian population?
A. Migration
B. Mutation
C. Selection
D. Random shift
Choose the correct answer from the options given below:
In general F\(_2\), F\(_3\) and the subsequent generations do not show segregation for a cytoplasmically inherited trait. This is because
A method for culturing anaerobes is the GasPak System, which uses hydrogen and a ___________ catalyst to remove O\(_2\).
The antimicrobial agent mercuric chloride functions by
Match LIST-I with LIST-II
Choose the correct answer from the options given below:
Which one of the given statement is not correct about plant viruses ?
Hepatitis C virus can cause liver cancer. It has:
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:
Agar is used for preparing solid media for culture. Which of the following is not true about agar media?
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:
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
Choose the correct answer from the options given below:
Match LIST-I with LIST-II
Choose the correct answer from the options given below:
Match LIST-I with LIST-II
LIST-I (Immunoglobulin Class) LIST-II (Characteristics)
A. IgGI. Serves as part of B-cell receptor complex  
B. IgAII. Anaphylactic mediating antibody  
C. IgDIII. Most abundant in body fluid, neutralize toxins, opsonizes bacteria  
D. IgEIV. Secretory antibody and protect mucous membrane  
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:
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?