Biochemistry MCQs Online Test and Flashcards

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Questions and Answers

What is bioenergetics?

The study of energy relationships and conversions in biological systems. (correct)

The study of genetics in biological systems.

The study of ecology in biological systems.

The study of behavior in biological systems.

What is the first amino group entering the urea cycle?

Ornithine

Carbamoyl phosphate (correct)

Citrulline

Arginine

What is the function of molecular chaperones?

To activate a specific phospholipase C in renal collecting duct epithelial cells.

To rescue improperly folded proteins and allow them to refold properly. (correct)

To catalyze the breakdown of PIP2 into IP3 and diacylglycerol in cell signaling.

To directly phosphorylate tyrosines to initiate a kinase protein enzymatic cascade.

What is the function of thiazolidinediones?

To reduce the levels of fatty acids circulating in the blood and increase sensitivity to insulin. Signup and view all the answers

What is the role of messenger RNA?

To carry genetic information from DNA for protein synthesis. Signup and view all the answers

What is the function of reverse transcriptase?

To transcribe single-stranded RNA into DNA. Signup and view all the answers

What is the function of collagen?

To provide structural support to tissues. Signup and view all the answers

What is the function of vasopressin?

To activate a specific phospholipase C in renal collecting duct epithelial cells. Signup and view all the answers

What is bioenergetics?

The study of energy relationships and conversions in biological systems. Signup and view all the answers

What is the function of messenger RNA?

To carry genetic information from DNA for protein synthesis. Signup and view all the answers

What is the role of molecular chaperones?

To rescue improperly folded proteins and allow them to refold properly. Signup and view all the answers

What is the function of vasopressin?

To activate a specific phospholipase C in renal collecting duct epithelial cells. Signup and view all the answers

What is the role of reverse transcriptase?

To transcribe single-stranded RNA into DNA. Signup and view all the answers

What is the function of thiazolidinediones?

To reduce the levels of fatty acids circulating in the blood and increase sensitivity to insulin. Signup and view all the answers

What is the role of glutamate dehydrogenase?

It operates at an important intersection of carbon and nitrogen metabolism. Signup and view all the answers

What is the function of corticotropin?

To activate the adrenal cortex. Signup and view all the answers

Study Notes

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.

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Description

Test your knowledge on biochemistry with these multiple-choice questions and answers. Covering topics such as proteins, enzymes, nucleic acids, lipids, membranes, signaling transduction, bioenergetics, metabolic pathways, cell signaling, and more, this quiz is perfect for exam preparation, online tests, quizzes, and interviews. With over 1000 MCQs, you can challenge yourself and assess your understanding of biochemistry concepts. Incorporating keywords specific to each topic, this quiz will help