WGU C785 OA Final Exam 2023

WGU C785 OA Final Exam 2023 1. Which reaction is involved in the digestions of proteins? Hydrolysis 2. Which cellular molecules assist denatured proteins in refolding into a functional form? Chaperones 3. Which factors favor the deoxygenated form of hemoglobin? Low pH High Carbon 4. Which situations would block the synthesis of fatty acids in the liver? Defect in the enzyme required to convert acetyl-coa into pyruvate. 5. which molecule is produced when two amino acids are joined by a peptide bond? Dipeptide 6. Which Myoglobin molecule in the blood can provide evidence of a heart attack? 7. what happens to hemoglobin structure as pH increase from 7.2 to 7.4? The Hemoglobin shifts to the R state. What happens to hemoglobin structure as pH decreases From 7.4 to 7.2? D)The heme groups become dome shaped What is the effect of pH on hemoglobin fiber formation in sickle cell anemia? A.)At a lower pH hemoglobin aggregates to form fibers What order is the order of processes that occur during base excision repair of a strand of mammalian DNA after the damage has been identified? A)Section of Homologous chromosome is aligned with damaged section, correct oligonucleotide is synthesized DNA backbone is ligated What is a characteristic of protein denaturation? D. They are irreversibly functional c. Exposed hydrophobic amino acids cause the misfoldedproteins to stick together. How does the misfolding of protein structure at the tertiary l In what condition does hemoglobin bind to oxygen most readily? A) Hemoglobin is already bound to one oxygen molecule What is the effect of pH on hemoglobin fiber formation in sickle cell anemia? b) at a lower pH, hemoglobin aggregates to form fibers What occurs during RNA proccessing to form a mature mRNA? A) The introns are removed from the mRNA Which type of DNA damage is corrected by mismatch repair? C- replication error What happens when hemoglobin is in the relaxed R state? B. The heme group Is in the planar conformation and oxygen fines strongly. What is a characteristic of the lipid in the diagram? The active site of an enzyme is stabilized by an ionic bond between a positively charged amino acid at position 115 and a negatively charged amino acid at position 213. A non-functional version of the enzyme was found to have a substitution of amino acid 115 to a negatively charged amino acid. Which additional amino acid substitution at position 213 would most likely restore the functionality of the enzyme? Positively charged amino acid Which process is an example of an anabolic pathway? Glycogenesis which type of molecule can be used in gluconeogenesis? b- amino acid An athlete is preparing for a race and consumes a carbohydrate heavy meals days before. which pathway is triggered by an excess intake of carbs? gluconeogenesis Which molecule in the blood can provide evidence of a heart attack?— myoglobin Which product of the citric acid cycle is needed to continue aerobic metabolism? • NADH What metabolic pathway is common to both aerobic and anaerobic processes of sugar catabolism glycolysis Amylose, a starch, and cellulose are both polysaccharides made from glucose monomers; however, only amylose is digestible. What is the biochemical difference that allows amylose to be digested? Amylose is attached to proteins by glycosylation. Proof reading exon Which DNA repair mechanism can replace a 28 base section of one strand of DNA on a human chromosome? lease repair???????? In the steps of glycolysis shown in the diagram, what effect should be observed if the enzyme that acts on the substrate dihydroxyacetone phosphate were inactivated? OGlycolysis would stop.??????? What would produce the least amount of ATP in a person with a medium chain acyl-CoA dehydrogenase deficiency(MCADD)? a) triglycerides with three 10 carbon fatty acid chains the enzyme acetylcholinesterase braks down the acetylchole in the brain leading to neuron degenerations. Which of the following strategies represents the best way to increase acetylcholine levels? Non-competative inhibition of acetylcholinesterase. When inhibitor F is present, which best describes what will happen to enzyme 2? Enzyme 2 will be high due to negative feedback. Fish that inhabit cold waters maintain their cell membrane fluidity by incorporating more of the following types of molecules. Trans fatty acids. Increased methylation of the promoter region of a tumor suppressor gene in a developing fetus Which of the following describes an epigenetic change Glucose and glycogen stores are depleted during long-distance running. Which pathway is responsible for providing energy for glucose-dependent cells, such as brain cells, during extended periods of exercise? Glycolysis What is a difference between myoglobin and hemoglobin? Only one displays cooperatively in O2 binding