List of top Biochemistry Questions

Arrange the following phases of cell cycle in order of occurrence: A. S phase, B. M phase, C. G1 phase, D. G2 phase Choose the correct answer from the options given below:

Arrange the following stages in sequence shown for human embryogenesis: A. Zygote, B. 8-cell stage, C. Gastrula, D. Blastula, E. Morula Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Rifampicin is used to treat various bacterial infections particularly tuberculosis. Reason (R): It acts by disrupting the bacterial cell-wall, nuclear membrane and mitochondria. In the light of the above statements, choose the most appropriate answer from the options given below:

Identify the correct set(s) of essential amino acids: A. Alanine, Lysine B. Lysine, Methionine C. Threonine, Serine D. Methionine, Threonine Choose the correct answer from the options given below:

Which of the following enzymes under appropriate conditions produce single-stranded nicks in DNA?

Bacillus thuringiensis (Bt) produces proteins that kill certain insects and save crops: A. Bt toxin exist in inactive form (prototoxin) in bacteria B. Acidic pH of the insect gut activate toxin C. Bt toxin (protein) is present in beetles D. Due to the alkaline pH in the insect's gut it is converted into active toxin to kill the insects Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Penicillin is an antibiotic that is used for killing bacteria. Reason (R): Antibiotic penicillin kills bacteria by inhibiting bacterial cell wall synthesis. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): When an individual amino acid is part of a peptide or protein it is called amino acid residue. Reason (R): When an amino acid becomes part of a protein or peptide through peptide bond it loses a molecule of water and is called amino acid residue. In the light of the above statements, choose the most appropriate answer from the options given below:

What is the correct sequence of polymerase Chain Reactions? A. Annealing, B. Extension, C. Final extension, D. Heat-denaturation, E. Storage ($4^{\circ}\text{C}$) Choose the correct answer from the options given below:

What are the correct steps in the synthesis of light chain of immunoglobulins? A. mRNA, B. Rearranged DNA, C. Original DNA, D. Primary transcript, E. Protein (light chain of Ig) Choose the correct answer from the options given below:

What are prosthetic groups?

Which statement is correct about the isoenzymes of LDH?

What will happen to a crude extract of urease when it is purified by gel filtration?

A store-bought corn (several days after picking) is not very sweet due to the fact that:

Choose correct options regarding enzyme with their respective substrates: A. Monoamine oxidase: Catecholamines B. HMG CoA reductase: Hypoxanthine xanthine C. Acetyl choline esterase: Acetyl choline D. Dihydropteroate synthase: Para-amino benzoic acid (PABA) E. Vitamin K epoxy reductase: Amphetamine Choose the correct answer from the options given below:

The complement system helps the body immunity in following 4 ways. Its correct sequences is: A. Inflammatory reaction, B. Opsonization, C. Complement fixation, D. Clearance of antigen-antibody complexes Choose the correct answer from the options given below:

Recent studies using GFP fusion proteins have allowed study of protein dynamics in living cells. Initially, GFP was derived and cloned from:

Enzymes are classified on the basis of reaction they catalyze. Which of the following are correct combinations? A. Oxidoreductase: Oxidation-reduction reaction B. Transferases: Transfer of group C. Hydrolases: Catalyze hydrolysis D. Lyases: Addition of group E. Ligases: Catalyze inter-conversion of group Choose the correct answer from the options given below:

Enzymes used in recombinant research are: A. Terminal Transferases B. Pyruvate kinase C. Reverse Transcriptase D. Hexokinase Choose the correct answer from the options given below:

Which immune system fails to discriminate between self and non-self? A. Insulin-dependent diabetes ($\beta$-cell antibodies) B. Asthma (antibodies against lung cells) C. Myasthenia gravis (acetylcholine receptor autoantibodies) D. Hepatitis (antibody against hepatic cells) E. Rheumatoid arthritis (antibodies against joint protein) Choose the correct answer from the options given below:

Genetic Disorders in human is/are: A. Down's syndrome - Trisomy at chromosome 21 B. Parkinson's disease - Tyrosine hydroxylase C. Diabetes mellitus D. Phenylketonuria - Phenylalanine hydroxylase Choose the correct answer from the options given below: