List of top Life Science Questions

Match List I with List II:

List I (Enzyme)	List II (Function)
(A) Cytochrome oxidase	(I) Electron transport system
(B) Topoisomerases	(II) Change linking number
(C) Cohesins	(III) DNA Replication
(D) PCNA	(IV) Cell cycle

Choose the correct answer from the options given below:

Which of the following enzyme is inhibited by citrate in Kreb's cycle?

Why does the presence of proline destabilize α-helix?
(A) Proline residue introduces a destabilizing kink in the α-helix
(B) In proline, the nitrogen atom is a part of a rigid ring, and rotation about N-C bond is not possible
(C) The nitrogen atom of a proline residue in a peptide linkage has no substituent hydrogen to participate in hydrogen bonds with other residues
(D) Proline residue works as a helix linker
Choose the correct answer from the options given below:

Which of the following are components of lipid rafts in plasma membrane?
(A) Cholesterol
(B) Sphingolipids
(C) Glycolipids
(D) Phospholipids
Choose the correct answer from the options given below:

Match List I with List II:

List I (Vitamin)	List II (Disorder)
(A) Vitamin-A	(I) Night blindness
(B) Vitamin-D	(II) Scurvy
(C) Vitamin-C	(III) Fat-soluble vitamin
(D) Vitamin-K	(IV) Blood clotting

Choose the correct answer from the options given below:

Identify the correct sequence of the given intermediates formed during glycolysis:
(A) Fructose 1,6-biphosphate
(B) Fructose 6 phosphate
(C) Lactate
(D) Phosphoenolpyruvate
Choose the correct answer from the options given below:

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

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

Choose the correct answer from the options given below:

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:

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

Choose the correct answer from the options given below:

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
Choose the correct answer from the options given below:

Retroviruses are enveloped viruses that can be engineered to deliver how many bases of single-stranded RNA?

On the basis of type of body cavity, platyhelminthes can be categorized as

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:

Vaccine is not available for which disease?

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

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

The peptidyl transferase enzyme activity is located in the

Transcription factors that mediate the binding of RNA polymerase to DNA template are
A. TFIIA
B. TATA box
C. TFIIB
D. Small nuclear ribonucleoproteins
Choose the correct answer from the options given below:

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

Which of the following enzyme is defective in galactosemia—a fatal genetic disorder in infants?

What percentage of genes are found in the human genome?

Which of the following are viral diseases?
(A) Yellow fever
(B) Hepatitis B
(C) Chickenpox
(D) Rabies
Choose the correct answer from the options given below:

Antibody formed immediately after infection is-

Arrange according to their lower to higher genome size:
(A) Lambda (λ)
(B) T4
(C) Φ x 174
(D) T7
Choose the correct answer from the options given below: