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Question
Enzymes are regulated by induction, covalent regulation (a form of posttranslational modification), and allosteric modification. Pick out THREE (3) of your favorite enzymes from the enzymes involved in glycolysis, the TCA cycle, gluconeogenesis, glycogenesis, or glycogenolysis. Then, indicate: the reaction that the enzyme catalyzes; what tissue(s) this occurs in; how it is regulated (via one of the mechanisms listed above); and what signals are involved in its regulation. NOTE: Long answers are unnecessarythis can be done in a relatively short single sentence.Answer
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Related questions
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Describe the process by which vitamin B12 is digested and absorbed.
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Indicate whether the statement is true or false. If the statement is false, explain why it is false.
Circulating concentrations of a vitamin typically reflect diet, whereas intracellular (e.g., RBCs, leukocytes) concentrations reflect body pools.
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Indicate whether the statement is true or false. If the statement is false, explain why it is false.
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Which of the following vitamins has a Tolerable Upper Intake Level established?
a. thiamin
b. riboflavin
c. vitamin B6
d. vitamin B12
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a. R binders and hydrochloric acid, colon
b. pepsin and hydrochloric acid, ileum
c. R protein and intrinsic factor, ileum
d. R protein and intrinsic factor, duodenum
Q:
What amount of supplemental folic acid is recommended daily for women of childbearing age in the United States?
a. 200 ug DFE
b. 400 ug DFE
c. 600 ug DFE
d. 800 ug DFE
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Tetrahydrofolate is vitally important for dividing cells during growth and cancer and knowledge of this need is used in cancer treatment by giving the drug methotrexate to inhibit the enzyme _____.
a. folylpolyglutamate synthetase
b. dihydrofolate reductase
c. formimino glutamate
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Synthesis of coenzyme A starts with the phosphorylation of which vitamin?
a. pyridoxal phosphate
b. pantothenic acid
c. vitamin E
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b. B6.
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Describe how the effects of anorexia nervosa are similar to the effects of starvation.
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b. 130 lb
c. 137 lb
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The present diet of the student in question #25 provides 2500 kcal per day. This diet:
a. is meeting her kcal needs.
b. needs to be increased by 300 kcal.
c. would cause about 1 lb per week weight loss.
d. would cause weight gain of about 0.5 lb per week.
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b. demonstrate that the supplements are safe
c. provide a disclaimer on the label stating that "this statement has not been evaluated by the Food and Drug Administration"
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c. nickel
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Which ultratrace element is not required by humans in its ionic form, but is a necessary component of the coenzyme form of a vitamin?
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b. boron
c. cobalt
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Toxicity of which element results in green tongue, diarrhea, and GI cramps?
a. vanadium
b. silicon
c. arsenic
d. boron
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a. nickel
b. arsenic
c. vanadium
d. boron
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Which ultratrace element, in pharmacological quantities, mimics the action of insulin?
a. boron
b. silicon
c. nickel
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Which ultratrace element affects the composition, structure, and strength of bones as well as cell membrane stability and inflammation?
a. vanadium
b. cobalt
c. arsenic
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Which of the following groups of foods are richest in boron, providing 1.0 to 4.5 mg/100 g?
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b. pork, beef, and poultry
c. milk , butter, cheese, and yogurt
d. fish and shellfish
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a. arsenic
b. vanadium
c. boron
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What two minerals can cause damage to cells when in their free ion forms?
a. iron and copper
b. zinc and molybdenum
c. iodine and manganese
d. zinc and copper
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Which vitamin may enhance copper reduction?a. niacinb. biotinc. ascorbic acidd. -carotene