Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 41, Problem 24CTQ
In terms of evolution, why might the urea cycle have evolved in organisms?
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Which of the following statements regarding the urea cycle is true?
(A) Fumarate acts as a connecting link between urea cycle and the CAC.(B) The urea cycle occurs solely in the mitochondria.(C) Citrulline and arginine reacts to form argininosuccinate.(D) Ornithine formed in the last reaction of the urea cycle is excreted from the body along with urea.(E) The purpose of the urea cycle is to produce energy (4 ATP per ammonia that enters) for the liver.
Which amino acids are involved in the urea cycle but not the genetic code?
Which compounds link the urea and Krebs cycles?
Chapter 41 Solutions
Biology 2e
Ch. 41 - Figure 41.5 Which of the following statements...Ch. 41 - Figure 41.6 Which of the following statements...Ch. 41 - Figure 41.8 Loop diuretics are drugs sometimes...Ch. 41 - When a dehydrated human patient needs to be given...Ch. 41 - The sodium ion is at the highest concentration in:...Ch. 41 - Cells in a hypertonic solution tend to: shrink due...Ch. 41 - The macula densa is/are: present in the renal...Ch. 41 - The osmolarity of body fluids is maintained at...Ch. 41 - The gland located at the top of the kidney is the...Ch. 41 - Active transport of K+ in Malpighian tubules...
Ch. 41 - Contractile vacuoles in microorganisms:...Ch. 41 - Flame cells are primitive excretory organs found...Ch. 41 - BUN is. blood urea nitrogen blood uric acid...Ch. 41 - Human beings accumulate ____before____ excreting...Ch. 41 - Renin is made by. granular cells of the...Ch. 41 - Patients with Addison's disease retain water...Ch. 41 - Which hormone elicits the 'fight or flight”...Ch. 41 - Why is excretion important in order to achieve...Ch. 41 - Why do electrolyte ions move across membranes by...Ch. 41 - Why are the loop of Henle and vasa recta important...Ch. 41 - Describe the structure of the kidney.Ch. 41 - Why might specialized organs have evolved for...Ch. 41 - Explain two different excretory systems other than...Ch. 41 - In terms of evolution, why might the urea cycle...Ch. 41 - Compare and contrast the formation of urea and...Ch. 41 - Describe how hormones regulate blood pressure,...Ch. 41 - How does the renin-angiotensin-aldosterone...
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- In humans, where does amino acid catabolism occur (i.e., the urea cycle)? a)Pancreas b)Kidney c)Skeletal muscle d)Liver e)Urea cycle enzymes are found in all tissuesarrow_forwarda) What is the role of the lysosome in degrading proteins? What are the enzymes that degrade/hydrolyze proteins? How does the further degradation of amino acids occur?b) Explain the urea cycle and summarize the steps of the urea cycle starting from carbamoyl phosphate.arrow_forwardHow does the level of glutamic acid affect the urea cycle?arrow_forward
- A newborn is brought into a clinic, and his parents indicate that their baby is lethargic, vomits periodically, and has tremors. It is suspected that the baby might have hyperammonemia. The cause may be due to urea cycle defects, indicating that the high ammonia level is due to an enzymatic block in ammonia metabolism within the urea cycle. What are the enzymes of the urea cycle? Describe their reactions in order to understand the cause of this phenomenon?arrow_forwardThe committed step in the urea cycle is: A、condensation of citrulline with aspartate B、export of citrulline from the matrix C、cleavage of urea from arginine D、Formation of carbamoyl phosphatearrow_forwardOrder the following events as they occur in the matrix: 1 2 4 5 1 Flux through the urea cycle will increase Glutamate levels are high N-acetylglutamate will be high Urea production will increase CPS I will be activatedarrow_forward
- Ammonia enters the urea cycle as: OA) aspartate. OB) glutamate. C) carbamoyl phosphate. OD) NH4.arrow_forwardWhich of the following amino acids have a role in the urea cycle (check all that apply)? Aspartate Arginine Glutamate Asparaginearrow_forwardDefine the following terms:a. urea cycleb. Krebs bicyclec. carbamoyl phosphated. ureotelic organisme. ornithine translocasearrow_forward
- Treatments for urea cycle enzyme deficiencies summarize deficiencies and the strategies for treatment.Chose one urea cycle enzyme disorder and describe what are the symptoms and how are the symptoms connected to the mutation? How are the disorder discovered and treated? Is there a dietary approach to treatment and, if so, why does it work? How common is the disorder? Are there populations were incidence more prevalent? And What is the prognosis? (include references)arrow_forwardWhy is the urea cycle important? Give typing answer with explanation and conclusionarrow_forwardArgue logically that the urea cycle should nothave evolved. Then, logically counter your argument.arrow_forward
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