Biochemistry MCQ Quiz

Biochemistry, Proteins, Enzymes, Nucleic Acids: Multiple-Choice Questions and Answers

• Over 100 topics in Biochemistry are covered by 1000+ MCQs, aiding in exam preparation, online tests, quizzes, and interviews.

• Hydrogen bonds between water molecules keep water a liquid at normal temperature.

• The heat of vaporization of water is around 540 Kj/g.

• Current has no effect on the degree of ionization, which depends on temperature, solvent type, and concentration.

• Corticotropin, a 39-residue hormone, is produced by the anterior pituitary gland and activates the adrenal cortex.

• Column chromatography's resolution improves as the column length increases.

• James D. Watson and Francis Crick deduced the double-helical structure of DNA in 1953.

• An α-helix's stability is influenced by the presence of Proline and Glycine residues.

• Collagen consists of three amino acids, all of which are glycine.

• Molecular chaperones rescue improperly folded proteins and allow them to refold properly.

• Messenger RNA carries genetic information from DNA for protein synthesis.

• Meristem culture helps produce fresh, complete, and virus-free plants.Multiple-Choice Questions and Answers on Lipids, Membranes, and Signaling Transduction

• Saponification number measures the amount of KOH needed to neutralize free and mixed fatty acids in one gram of fat.

• Glycolipids have a direct glycosidic linkage between head-group sugar and backbone glycerol.

• Vasopressin activates a specific phospholipase C in renal collecting duct epithelial cells.

• The inner mitochondrial membrane of hepatocytes contains low cholesterol and high cardiolipin.

• Sphingomyelin is a choline-containing lipid found in the outer leaflet of membranes.

• Cytochrome c does not function in cell-cell interaction.

• The six types of signal transducers are gated ion channels, receptor enzymes, G protein-coupled receptors, nuclear proteins, membrane proteins, and adhesion receptors.

• Inositol triphosphate is an intracellular secondary messenger in cell and lipid signaling.

• Inhibitory serine phosphorylation is a molecular mechanism underlying insulin resistance.

• Phospholipase C catalyzes the breakdown of PIP2 into IP3 and diacylglycerol in cell signaling.

• Receptor tyrosine kinase directly phosphorylates tyrosines to initiate a kinase protein enzymatic cascade.

• The two-component system drives bacterial chemotaxis by coupling autophosphorylation of His kinase to phosphorylation of the respective regulatory protein.

Title: Multiple-Choice Questions and Answers on Bioenergetics, Metabolic Pathways, and Enzyme Regulation

• Bioenergetics is the study of energy relationships and conversions in biological systems.
• Anabolism and catabolism are linked chemically in the form of ATP.
• Fructose 2,6-bisphosphate is a hormone that regulates glycolysis and gluconeogenesis.
• The flux control coefficient measures the effect of an enzyme's concentration on flux through a multi-enzyme pathway.
• The elasticity coefficient measures how responsive an enzyme is to changes in the concentration of a metabolite.
• Amino transferases remove the amino groups in the catabolism of most L-amino acids in the liver.
• Glutamate dehydrogenase operates at an important intersection of carbon and nitrogen metabolism.
• Carbamoyl phosphate is the first amino group entering the urea cycle.
• Only lysine is exclusively glucogenic among the given amino acids.
• Complex IV, also known as cytochrome oxidase, catalyzes the final step in mitochondrial electron transport chain.
• NADH dehydrogenase's prosthetic group is FMN.
• Long-chain fatty acids are oxidized step-wise in one-carbon unit starting from the aliphatic end.

Title: Multiple-Choice Questions and Answers on Cell Signaling, Metabolism, and Enzyme Regulation

• The activity of an enzyme is determined by its association with regulatory proteins, sequestration, alloBiochemistry MCQs: Multiple Choice Questions and Answers

• The text consists of multiple-choice questions and answers in the field of biochemistry.

• The questions cover various topics such as one-carbon metabolism, mitochondrial genes, oxidative stress, photophosphorylation, biosynthesis of fatty acids, nitrogen metabolism, chromosomal elements, DNA replication and repair, RNA synthesis, genetic code, protein synthesis, and degradation.

• Thiazolidinediones are a class of drugs that reduce the levels of fatty acids circulating in the blood and increase sensitivity to insulin.

• Phosphatidylinositol is involved in the bio-signaling pathway that includes membrane turnover and exocytosis.

• Two molecules of acetyl co-A condense to form acetoacetyl co-A, which condenses with the third molecule of acetyl co-A to yield a six-carbon compound HMG co-A.

• Glutamine amidotransferase catalyzes reactions that incorporate nitrogen derived from glutamine.

• Aspartate gives rise to methionine, threonine, and lysine.

• Reverse transcriptase (RT), also known as RNA-dependent DNA polymerase, is a DNA polymerase enzyme that transcribes single-stranded RNA into DNA.

• 3rd position is said to wobble in codon. Binding of a codon in an mRNA the cognate tRNA is much "looser" in the third position of the codon.

• Leucine zipper will mediate protein interaction facilitates the dimerization of the protein by interdigitation of two leucine-containing helices on different molecules.

• Arabinose is a carbohydrate and not controlled by attenuation.

• Many marine animals' extracellular fluid is hypertonic to sea water/oceans.