List of top Life Science Questions

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

Yellow fever is caused due to the human-to-human transmission by-

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

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

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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
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Match List I with List II:

List I	List II
(A) D’Herelle and Twort	(I) Bacterial transformation
(B) Beadle and Tatum	(II) Penicillin
(C) Fleming	(III) One-gene-one-enzyme hypothesis
(D) Griffith	(IV) Bacterial viruses

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Vaccine is not available for which disease?

Antibody formed immediately after infection is-

Lederberg and Tatum describe the phenomena of-

Which of the following are viral diseases?
(A) Yellow fever
(B) Hepatitis B
(C) Chickenpox
(D) Rabies
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What is the function of DNA gyrase in circular DNA?

Which of the following is the example of Gram-negative bacteria?

Which one of the recombinant DNA techniques is almost obsolete?

In the human karyotype, chromosomes are divided into how many groups?

In the human karyotype, the X chromosome belongs to which group?

Arrange the different steps of transcription in the correct order:
(A) Transcription bubble formation
(B) Phosphorylation of CTD tail
(C) Recruitment of elongation factors
(D) Dephosphorylation of CTD tail
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Gene gun is one of the popular physical delivery methods. Microparticles that are loaded to deliver DNA are made up of which metal?

While delivering genes by chemical methods, one popular conjecture about what happens to poly(ethylenimine)/DNA complexes following endocytosis is known as the proton sponge hypothesis, which entails the following steps:
(A) PEI/DNA complexes are endocytosed.
(B) V-ATPases will pump protons into the vesicular interior.
(C) Water will enter the vesicle to balance the osmotic gradient.,
(D) The vesicle will swell due to the entry of ions and water, leading to rupture.
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Arrange the steps in the correct order as they are involved in RNA interference (RNAi):
(A) Formation of small interfering RNAs (siRNAs)
(B) Activation of RNase III-like enzyme Dicer
(C) Inactivation of target RNA
(D) Formation of RISC complex
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Retroviruses are enveloped viruses that can be engineered to deliver how many bases of single-stranded RNA?

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?

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
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What are the functions of topoisomerases?

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