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MCB450 Exam 3 Lon-Capa questions and answers with verified solutions
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MCB450 Exam 3 Lon-Capa questionsand answers with verified solutions
Carbohydrates are less-efficient fuel sources than fats because the carbon in fats
is more: - ANSWER✔✔ Reduced
One of the main roles of the liver is to act as a blood glucose buffer. As such,
glucose only enters the glycolic pathway in the liver when blood sugar levels
exceed normal levels. Entry of glucose from the blood supply into the liver is
regulated by the GLUT2 receptors. Which of the following mechanisms is used by
GLUT2 receptors to ensure that the liver only uses glucose in times of plenty? -
ANSWER✔✔ higher Km than other Glut receptors
Fructose-2,6-bisphosphate is a potent allosteric activator of liver
phosphofructokinase, which is produced from fructose-6-phosphate by PFK2. -
ANSWER✔✔ True
Aldolase is the key regulatory enzyme in the mammalian glycolytic pathway. -
ANSWER✔✔ False
Which of the following enzymatic steps are not part of the gluconeogenesis
pathway? - ANSWER✔✔ Hexokinase
Insulin stimulates gluconeogenesis. - ANSWER✔✔ False
The enzyme transketolase transfers a three-carbon fragment from a ketose to an
aldose. - ANSWER✔✔ False
, Which of the following enzymatic steps are not part of the oxidative phase of the
PPP? - ANSWER✔✔ Phosphopentose isomerase
When the need for ribose 5-phosphate is greater than the need for NADPH most
of the ribulose 5-phosphate is converted into fructose 6-phosphate. -
ANSWER✔✔ False
The PPP yields NADH and FADH2. - ANSWER✔✔ False
Which of these compounds is oxidized by a multienzyme complex that requires
five different coenzymes? - ANSWER✔✔ Pyruvate
The conversion of malate to oxaloacetate generates one molecule of FADH2. -
ANSWER✔✔ False
PDH phosphatase deficiency results in high levels of acetyl CoA. - ANSWER✔✔
False
In a metabolic pathway, a reaction that best serves as a committed step: -
ANSWER✔✔ Has a large negative ΔG.
The electrons released during oxidation reactions cannot be captured by: -
ANSWER✔✔ ADP
How many protons and electrons can the following molecule accept? FAD -
ANSWER✔✔ 2 e-, 2 p+
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