UNE CHEM 1005 TESTS COMPILATION BUNDLE

What enzyme is used by the gluconeogenic pathway but NOT in the glycolytic pathway? correct answer: Phosphoenolpyruvate Carboxykinase PEPCK Newborn screening results show a biotinidase deficiency in a 2 day old infant. The deficiency impairs the infant's ability to reuse and recycle biotin. Due...

Control of Fatty Acid Synthesis vs. Oxidation correct answer: When Insulin is HIGH --> fatty acid synthesis occurs When Glucagon is HIGH --> lipolysis, fatty acid B-oxidation, ketogenesis occur **These never happen at the same time! Lipolysis correct answer: Process of releasing free ...

Somatostatin reduces the secretion of both glucagon and insulin through which of the following mechanisms? a. Somatostatin activates an activator G-protein b. Somatostatin activates MAPK cascade c. Somatostatin activates an inhibitory G-protein d. Somatostatin uses Ca+2 as a downstream signal...

Hemoglobin binds oxygen with a greater affinity in the: correct answer: R state Hemoglobin bound to heme is termed a holoprotein. The heme or porphoryin ring is required for oxygen binding and it is termed a: correct answer: prosthetic group Alpha helices and beta sheets are primarily stabil...

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What enzyme is used by the gluconeogenic pathway but NOT in the glycolytic pathway? correct answer: Phosphoenolpyruvate Carboxykinase PEPCK Newborn screening results show a biotinidase deficiency in a 2 day old infant. The deficiency impairs the infant's ability to reuse and recycle biotin. Due...

Carnitine palmitoyl transferase correct answer: - transfers acyl groups from CoA to carnitine & vice versa - inhibited by malonyl-CoA ketone bodies correct answer: - acetoacetate, β-hydroxybutyrate, acetone - oxidized as fuel source in extreme fasting d-3-hydroxybutyrate dehydrogenase cor...

Which of the following lipoproteins is responsible for carrying cholesterol from peripheral tissues (i.e skeletal muscle) back to the liver? correct answer: HDL What is the primary role of LCAT (Lecithin-cholesterol acyltransferase)? correct answer: To esterify cholesterol transported by HDL ...

1. Pyruvate dehydrogenase kinase catalyzes a reaction that results in which of the following? correct answer: The phosphorylation and inactivation of E1 subunit (pyruvate dehydrogenase complex 1. Which of the following intermediates is an allosteric activator of pyruvate kinase? correct answer: ...

During exercise the pathways of ____________________ and ______________________ are integrated as means of providing energy and reducing NH4+ levels. correct answer: BCAA catabolism and purine degradation The primary role of glutamine in the brain is to provide substrate for the synthesis of whi...

What are the four different protein structures? correct answer: 1. Primary 2. Secondary 3. Tertiary 4. Quaternary What is the primary structure of a protein? correct answer: a linear sequence of amino acids in polypeptide chains which is written from the amino terminus (N-terminus) to the ca...

Which of the following best describes tertiary structure? correct answer: Interactions between alpha helices and beta sheets to form a domain Movement of ammonia from an amino acid to an alpha-keto acid involves a family a enzymes best categorized as which of the following? correct answer: Tran...

Covalent catalysis is used by many enzymes to cleave peptide bonds. Which of the following amino acids would not facilitate this type of catalysis? (Think of the structure of the R-group of these amino acids) correct answer: Valine The R-group on valine does not have an active group to particip...

Changes in the physiological variables listed below can alter the affinity of hemoglobin for oxygen. Which of the following will lower the affinity of hemoglobin for oxygen? correct answer: Increase in 2,3 bisphosphoglycerate (BPG) A decreased affinity will increase the rate of oxygen delivery t...