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BCH403 Exam Questions| Already Answered| GRADED A+

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BCH403

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BCH403

T/F Under physiological conditions, a catabolic pathway will run backwards when there is a high concentration of ATP. - ANSWER-False T/F ATP is the energy currency of the cell. - ANSWER-True Which one of the following statements is correct regarding metabolic pathways? - ANSWER-Metabolic pathwa...

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BCH403 Exam Questions| Already
Answered| GRADED A+
T/F Under physiological conditions, a catabolic pathway will run backwards when there is a high
concentration of ATP. - ANSWER-False

T/F ATP is the energy currency of the cell. - ANSWER-True

Which one of the following statements is correct regarding metabolic pathways? - ANSWER-Metabolic
pathways always end at a specific molecule.

_______ is a bidirectional glucose transporter. - ANSWER-GLUT2

The glycolytic enzyme that is responsible for trapping glucose in a skeletal muscle cell is _______. -
ANSWER-Hexokinase

The most important regulatory step of glycolysis is ______. - ANSWER-Phosphofructokinase-1

T/F Pyruvate kinase is the only step of glycolysis that is regulated and generates ATP. - ANSWER-True

The most important regulatory step of gluconeogenesis is __________. - ANSWER-Fructose-1,6-
bisphosphatase

The gluconeogenesis enzyme found in the endoplasmic reticulum is ______________. - ANSWER-
Glucose-6-phosphatase

T/F Adipose tissue is capable of complete gluconeogenesis (i.e. can synthesize glucose). - ANSWER-False

T/F The liver is the major site of gluconeogenesis. - ANSWER-True

,Glycogen synthase: - ANSWER-Is the required site of glycogenesis.

Glycogenolysis: - ANSWER-Involves the synthesis of new a(1->4) linkages.

T/F a-amylase and isomaltase are required for the breakdown of dietary glycogen - ANSWER-True

In glycogen metabolism, the branching enzyme: - ANSWER-Synthesizes all a(1->6) linkages.

Glucose-6-phosphate is not involved in the regulation of: - ANSWER-Glucokinase

T/F Insulin increases pyruvate kinase activity and decreases the activity of phosphoenolpyruvate
carboxykinase. - ANSWER-False

Fructose-2,6-bisphosphate: - ANSWER-Activates glycolysis via phosphofructokinase-1 while inactivating
glycogenolysis via fructose-1,6-bisphosphatase

In skeletal muscles, glycogen synthase: - ANSWER-Is always active when not phosphorylated

Pyruvate dehydrogenase is NOT regulated by: - ANSWER-Glucagon

The major regulated step in the TCA cycle is: - ANSWER-Citrate synthase

Lactate dehydrogenase: - ANSWER-Replenishes NAD+ so that the glycolytic enzyme glyceraldehyde-3-
phosphate dehydrogenase can continue to run

T/F The entire Tricarboxylic Acid Cycle (or Krebs cycle or TCA cycle) is found in the mitochondria. -
ANSWER-True

How many electrons can Cyt C carry? - ANSWER-1

, When 3 electrons are transferred onto oxygen (O2), the result is: - ANSWER-hydroxyl radical

T/F Complex I is both a flavoprotein and cytochrome - ANSWER-False

In the liver, cytosolic electrons are transported into the respiratory chain via: - ANSWER-
Malate/aspartate shuttle

The site of ATP synthesis in Complex V (or ATP synthase or F0F1 complex) is: - ANSWER-aB-subunits

T/F Phosphate translocase may transport a proton (H+) into the mitochondrial matrix. - ANSWER-True

Which one of the following is not a proton pump? - ANSWER-Complex II

T/F Lipoprotein lipase is the only lipase in humans that can cleave all three fatty acids off of the glycerol
backbone. - ANSWER-True

T/F Triacylglycerols are slightly amphipathic. - ANSWER-False

Triacylglycerols that are synthesized in the liver are packaged into: - ANSWER-Very low density
lipoproteins

Dietary cholesterol is transported to and processed in: - ANSWER-Liver

T/F Adipose triglyceride lipase is the rate limiting step of lipolysis (fat mobilization). - ANSWER-True

The regulated step of beta-oxidation is: - ANSWER-Carnitine acyltransferase I

During beta-oxidation, cis-unsaturated fatty acids generate less energy than saturated fatty acids
because: - ANSWER-There is no net gain of electrons during the FAD-dependent oxidation step when
double bonds are present.

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Exam (elaborations)

BCH403 Exam Questions| Already Answered| GRADED A+

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