List of top Biochemistry Questions

Which of the following organs has both exocrine and endocrine functions?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Tropic hormones act on other endocrine glands to stimulate the release of their hormones and transmit signalling through cell surface receptors. Reason (R): This action is attributed to their lipophilic nature. 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): Intracellular receptors that act as transcription factors become activated by physiological ligands. Reason (R): They are activated in the interior of the cell (unlike extracellular receptors) because their physiological ligands are lipophilic in nature. 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): Some cell signalling receptors are at the cell surface with transmembrane domains that help them embed in the plasma membrane. Reason (R): They are localized at the cell surface as their activating ligands cannot enter the cell interior. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is an active form of thyroid hormone that acts through a nuclear receptor to stimulate energy-yielding metabolism by increasing the expression of genes encoding key catabolic enzymes?

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:

Mammalian cell division produces progeny cells by traversing different phases of mitosis. Arrange them in order of occurrence. A. Prophase, B. Telophase, C. Interphase, D. Anaphase, E. Metaphase Choose the correct answer from the options given below:

Arrange the following stages of spermatogenesis in proper sequence of sperm development: A. Spermatids, B. Spermatocytes, C. Spermatogonia, D. Spermatozoa 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?

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:

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:

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 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?

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:

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: