Metabolism multiple choice questions and answers pdf is a revision guide with a collection of trivia quiz questions and answers pdf on topics. Multiple choice question on metabolism and disposal of urea, creatinine and uric acid 1 the urea molecule consists of two nitrogens and one carbon atom. It was written primarily for use in revision courses for doctors who are preparing for competitive postgraduate pg medical entrance. The urea once produced, is excreted out by the kidneys in the urine. The urea cycle is smaller than the tca cycle, and has fewer intermediates. Mcq must be answered separately on the answer sheet provided as per the. A nucleus b mitochondria c cytoplasm d golgi apparatus. Dimski disposal of waste products accumulated during metabolic processes is integral to the health of any living organism. Within 48 hours, the newborn develops ketonuria, poor feeding, and a sweet odor is also noticed in the urine.
Inthiscasecis not a credible choice when it involves changing a small organic compound into an enzyme. Hemoglobin in abnormal urine can be qualitatively 30. Metabolism multiple choice questions and answers mcqs. The carbon and oxyg en of urea are derived fr om co 2. Urea is produced by the liver, and then is transport ed in the blood to the kidneys f or ex cretion in the urine. Learn vocabulary, terms, and more with flashcards, games, and other study tools. How does glutamate acquire the amino groups for this purpose. Nitrogen metabolism questions and answers pdf download. Chapter 30 amino acid degradation and the urea cycle multiplechoice questions 897 surplus amino acids are a stored in proteasomes. It is responsible for the conversion of toxic ammonia produced by amino acid catabolism to urea for excretion. If youre behind a web filter, please make sure that the domains. Organisms, like humans, that excrete urea are called ureotelic. On page 144 we find the question in the urea cycle, the cytosolic enzyme arginase cleaves arginine to yield.
The first nitrogen atom is derived from the free ammonium ion and second from an amino acid. Urea cycle was the first discovered metabolic cycle by hans krebs and kurt henseleit in1932. Urea is also called carbamide and when dissolved in water has a neutral ph. Multiple choice questions on krebs cycle or citric acid cycle. Which one is the largest particulate of the cytoplasm.
Urea cycle quiz questions and answers, urea cycle quiz answers pdf 101 to learn metabolism online course. Protein metabolism produces amino acids that can be oxidized, this result in the release of ammonia which is converted to urea via urea cycle and excreted as a waste product. Other organisms can secrete ammonium directly or make less soluble solid forms. Interestingly, all of the four intermediates are aamino acids, although three, ornithine, citrulline, and argininosuccinate are not found in proteins. Which of the following amino acid do not fall under the category of essential amino acid. The urea cycle requires five reactions of which four are part of the actual cycle. Fat and protein metabolism questions practice khan academy. Integration of metabolism, introduction to metabolism, metabolism of amino acids, metabolism of carbohydrates, metabolism of lipid, metabolism of nucleic acids, mineral metabolism to enhance. The first amino group entering into urea cycle is a carbomyl phosphate b ornithine c cituilline d argininosuccinate advertisement 3. The urea cycle is the first metabolic pathway to be elucidated. Nitrogen metabolism questions and answers pdf free download in biochemistry mcqs,interview questions,objective questions,multiple choice. The nitrogen atoms of urea produced in the urea cycle are derived from. Ammonia is converted to urea in the hepatocytes of the liver in five steps via urea cycle in the mitochondria first 2 steps and cytosol last 3 steps.
The urea cycle ornithine cycle and urea cycle disorders. Urea is used an osmolyte by the kidney to readsorb water and useful ions. Amino acid catabolism biochemistry medbullets step 1. Fat and protein metabolism questions if youre seeing this message, it means were having trouble loading external resources on our website.
The liver catabolizes toxic ammonia into urea as shown in figure 1. The amino acid that donates the second amino group for the formation of urea is a arginine b. Ornithine is the first member of the reaction, it is also called as ornithine cycle. It requires the coordinated function of six enzymes and two mitochondrial transporters to catalyze the conversion of a molecule.
Protein degradation the repeated synthesis and breakdown of structural proteins in the body release free. Multiple choice questions and test questions 100 multiple choice questions with answers highlighted in red for each question there is only one correct answer. Brown university authentication for webbased services. Some of the important topics which are given a good coverage include carbohydrate metabolism, protein metabolism, lipid metabolism, nucleic acids, enzymes, vitamins and mineral metabolism. Urea is neither acidic nor basic, so it is a perfect vehicle for getting rid of nitrogen waste. Final exam key uc berkeley mcb university of california, berkeley. Metabolism and disposal of urea, creatinine and uric acid.
Integration of metabolism, introduction to metabolism, metabolism of amino acids, metabolism of carbohydrates, metabolism of lipid, metabolism of nucleic acids, mineral. Nitrogen metabolism mcqs nitrogen metabolism objective type questions with answers. Mcqs in biochemistry for preparation to test lesson for module 2. How many molecules of atp are hydrolysed to form two molecule of ammonia. Mcq on nitrogen cycle nitrogen cycle is a biogeochemical process by which atmospheric nitrogen is converted into chemical forms to make it available for living organisms and is returned back into the atmosphere. Question bank short and long questions on theory topics 1. Following synthesis in the liver, urea is carried out in the blood to the kidney which is readily filtered from the plasma by glomerulus. Mcqs series for life sciences volume 1 parslow 2015.
The urea cycle is the primary nitrogendisposal pathway in humans. On highprotein diets the carbon skeletons of the amino acids are oxidized for energy or stored as fat and glycogen, but the amino nitrogen must be excreted. Benedicts test for detection of uric acid in urine detected by. False, the urea cycle is limited to the tissues of the liver. Know the substrates, products, and five enzymes of the urea cycle. Multiple choice question on lipid metabolism including fatty acids, cholesterol and its regulations. Many amino acids can be converted to glutamate that can, in turn, be converted to aspartate. Metabolism multiple choice questions and answers mcqs by. Integration of metabolism, introduction to metabolism, metabolism of amino acids, metabolism of carbohydrates, metabolism of lipid, metabolism of nucleic acids, mineral metabolism to enhance teaching and. However i have seen bad students select comparably impossible statements in. Multiple choice questions louisiana tech university. Both ornithine and citrulline are intermediates in urea cycle. To access free multiple choice questions on this topic, click here. To facilitate this process, enzymes of the urea cycle are controlled at the gene level.
Name the enzyme a citrate synthase b succinate dehydrogenase c malate dehydrogenase d. Enzymes of tca cycle or krebs cycle are located in the matrix of mitochondria except one which is located in the inner mitochondrial membrane. The tca cycle is an oxidative pathway requiring oxygen for operation. Aspartate can enter the urea cycle to produce urea for excretion in the urine. Practice these mcqs on protein metabolism to score better in competitive exams and have a better comprehension of the topic in biochemistry. The urea cycle operates only to eliminate excess nitrogen. Learn more about shibboleth at brown brown university. The urea cycle eliminates unneeded nitrogen, derived from nitrogencontaining compounds, from the body in the form of urea. The urea cycle disorders ucd result from defects in the metabolism of waste nitrogen from the breakdown of protein and other nitrogencontaining molecules. Metabolism multiple choice questions and answers mcqs pdf is a revision guide with a collection of trivia quiz questions and answers pdf on topics. The urea cycle holds the distinction of being the first metabolic cycle discovered in 1932, five years before the citric acid cycle. Mcqs in medical physiology, may 20 2 minutes please think of this book as a tool to help you assess how well you have learnt medical physiology.