List of top Life Science Questions

Antibody formed immediately after infection is-

Identify the correct sequence of the given enzymes involved in the TCA cycle:
(A) Aconitase
(B) Fumarase
(C) Malate dehydrogenase
(D) α-ketoglutarate dehydrogenase
Choose the correct answer from the options given below:

Adenoviruses are frequently used in gene delivery experiments. Their average genome size is 36,000 base pairs. Of their total DNA content, up to how much of the adenovirus genome can be replaced by foreign DNA?

Match List I with List II:

List I (Enzyme)	List II (Reaction)
(A) DNase I	(I) Produces single-stranded nicks in DNA
(B) RNase A	(II) Degrades single-stranded RNA
(C) S1 nuclease	(III) Degrades single-stranded DNA
(D) RNase H	(IV) Cleaves the RNA strand of RNA-DNA hybrids

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The propagation of action potential in myelinated nerve fiber is faster because of-

Match List I with List II:

List I	List II
(A) Shoulder	(I) Tarsals
(B) Thigh	(II) Carpals
(C) Wrist	(III) Humerus
(D) Ankle	(IV) Femur

Choose the correct answer from the options given below:

The histone that links two histone octamers is:

Vessels are present in:

The peptidyl transferase enzyme activity is located in the

Which one of the recombinant DNA techniques is almost obsolete?

Number of chromosomes present in Arabidopsis thaliana is:

The leaves used for wrapping tobacco in a ‘bidi’ are:

The complete proteins produced by an organism at any one time is called:

Arrange the given processes involved in the nitrogen cycle:
(A) Ammonia formation
(B) Organic nitrogen formation
(C) Soil organic nitrogen formation
(D) Nitrate formation
Choose the correct answer from the options given below:

Arrange the steps involved in Gram-stain procedure:
(A) Staining with Crystal Violet
(B) Staining with Gram’s Iodine
(C) Decolorization
(D) Staining with Safranine
Choose the correct answer from the options given below:

Match List I with List II:

List I	List II
(A) Histone erasers	(III) Deacetylases
(B) Histone readers	(IV) Bromodomain proteins
(C) Histone writers	(I) Methyltransferase
(D) DNA unwinding	(II) Topoisomerase

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What percentage of genes are found in the human genome?

With the addition of linking number (Lk) by +2 to a relaxed DNA consisting of Lk = 200, which of the following occurs?

Which one of the following is a peat moss?

The portion of transmembrane proteins that cross the lipid bilayer are usually:

The perforation between left and right atria of a fetal heart is known as

The lymphoid stem cells in the bone marrow form
(A) Natural killer cells
(B) Platelets
(C) B lymphocytes
(D) Neutrophils
Choose the correct answer from the options given below:

Calcitonin is produced by

Gene gun is one of the popular physical delivery methods. Microparticles that are loaded to deliver DNA are made up of which metal?

Amino acid that serves as a precursor for formation of the pigment responsible for human skin color is-