After being stabilized with supplemental oxygen, a blood transfusion, and medication to helpwith the pain, JJ was prescribed the drug hydroxyurea to help increase the level of fetalhemoglobin (ay2) in the red blood cell. Though the exact pharmacological effect of hydroxyureais unclear in the treatment of Sickle Cell Disease, it is known that the drug is an inhibitor ofribonucleotide reductase and acts to transiently inhibit deoxyribonucleotide synthesis individing cells.Q5: In which phase of the cell cycle does hydroxyurea produce its main effect?

Hydroxyurea: It is a class of antimetabolites. This class of drug is used to treat cancer. It is a…

Answered: After being stabilized with…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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One form of anemia results when individuals have a deficiency in the enzyme phosphatidylinositol glycan A (PIGA). This enzyme is required for the membrane attachment of proteins anchored by glycolipids to the plasma membrane, using what is called a ‘GPI-linkage.’ Included in the group of GPI-linked cell surface proteins is DAF/CD55. These individuals become anemic because: DAF/CD55 prevents the lysis of red blood cells by infecting pathogens. DAF/CD55 normally prevents the spleen from clearing healthy red blood cells from the circulation. In the absence of PIGA, the red blood cell membrane is bare of proteins allowing increased access of complement activating proteins to attach to the cell membrane. DAF/CD55 is a complement inhibitory protein that inactivates any C3 convertase that may form on host cell surfaces. In the absence of PIGA, red blood cells are unable to synthesize high levels of hemoglobin.
Increased ROS levels are a hallmark for Alzheimer's Disease. This is accurately described by all but which of the following statements? ROS production is upregulated because of the activity of the enzyme NADPH oxidase Oxidative phosphorylation is increased, leading to enhanced ROS generation via the ETC Amyloid precursor protein is converted in higher amounts to the amyloid peptide facilitating greater amounts of aggregation BACE1 levels are transcriptionally increased via hypoxia inducible factor Mitochondrial pyruvate flux is reduced 00000
Atherosclerosis can obstruct or block flow in arteries, including those that provide oxygenated blood to the heart. Elevated levels of [ Select ] ["LDL, and VLDL", "HDL"] are associated with atherosclerosis, most likely because of their role in delivery of lipids to peripheral tissues and cells. Smooth muscle cells are recruited to the site of damage, where they [ Select ] ["induce apoptosis of endothelial cells", "proliferate"] , hence expanding the extent of the lesion.
Vitamin K questionsa) What transformation of glutamate side chains is Vitamin K (as its reduced form, VitaminKH2) involved in, and what is the relevance of this reaction to blood clotting?b) How does the blood thinner Coumadin (warfarin) prevent clotting?c) How can the dietary intake of large amounts of green vegetables, such as broccoli or kaleinterfere with the action of Coumadin?
Hemophilia B, an X-linked genetic disorder which highly affects males, is a condition in which levels of Factor VIII are significantly decreased. Please describe the physiologic pathway which utilizes Factor VIII and describe the consequences of missing this factor from a physiologic perspective.
What is the name of themolecule that transportsoxygen in red blood cells?
Do you expect worms with defects in unc-17 to become hyper-contracted and paralyzed by levamisole
Please fill in the following blanks with the options that correctly finishes the sentence. a. At a low O₂ pressure the [Select] hemoglobin is in a [Select] [Select] [Select] 9 [Select] " bond with [Select] heme, and the protein's central channel is [Select] b. The proximal histidine forms a(n) [Select] state is stabilized. In this conformation state, the heme prosthetic groups is each subunit's heme is more likely to be the proximal histidine is [Select ] bond with while the distal histidine forms a(n) [Select] to the
How can dietary changes affect the expression of Phenylketonuria?
The purified OXA-M290 enzyme can now be tested to determine which β-lactamase inhibitor is most effective. This inhibitor could be prescribed in combination with a β-lactam antibiotic to treat the infection caused by the E. coli KGH1 strain. Before testing inhibitors against OXA-M290, the kinetic activity of this enzyme must first be measured. The activity of OXA-M290 is measured using nitrocefin, a chromogenic β-lactam antibiotic. When nitrocefin is hydrolyzed by a β-lactamase, it changes from yellow to red in colour. The nitrocefin hydrolysis product has an extinction coefficient of 20,500 M-1 cm-1 at 486 nm. The hydrolysis of 60 μM nitrocefin by 1 nM OXA-M290 is monitored using a microplate reader. The absorbance of the wells in the plate is measured at 486 nm every 30 seconds. This experiment is carried out with three replicates, generating the following data: Time (min) Absorbance of Replicate 1 Absorbance of Replicate 2 Absorbance of Replicate 3 0.5 0.0984…
HbA1c is a glycated hemoglobin in which a glucose molecule is covalently bound to the N-terminal valine of a hemoglobin subunit. True False
Is GAPDH only a glycolytic enzyme? What are the other physiological functions of GAPDH?

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