ATP as Energy Currency Practice Questions

Question 1

Which of the following statements best describes the mechanism of action of insulin on target cells?

Accepted Answer

Insulin binds to a transmembrane receptor on the outer surface of the plasma membrane, activating the tyrosine kinase in the cytosolic domain of the receptor.

Answer

Insulin binds to a receptor on the outer surface of the plasma membrane, activating adenylate cyclase through the Gs protein.

Answer

Insulin binds to a cytoplasmic receptor and is transferred as a hormone receptor complex to the nucleus to modulate gene expression.

Answer

Insulin enters the cell and causes the release of calcium ions from intracellular stores.

Question 2

Hyperammonemia impairs the citric acid cycle by depleting which of the following?

Accepted Answer

α-ketoglutarate

Answer

Pyruvate

Answer

Oxaloacetate

Answer

Succinate

Question 3

What is the mechanism of cyanide poisoning?

Accepted Answer

Inhibition of cytochrome oxidase

Answer

Inhibition of complex I

Answer

Inhibition of cytochrome C

Answer

Inhibition of carbonic anhydrase

Question 4

ATP is generated in the Electron Transport Chain (ETC) specifically by which enzyme?

Accepted Answer

FoF1 ATPase

Answer

Cl- ATPase

Answer

ADP Kinase

Answer

Na+/K+ ATPase

Question 5

ATPase activity is present in

Accepted Answer

Myosin

Answer

Actin

Answer

Actin during interaction with myosin

Answer

None of the options

Question 6

ATP is consumed at which of the following steps of glycolysis?

Accepted Answer

Hexokinase

Answer

Pyruvate kinase

Answer

Isomerase

Answer

Enolase

Question 7

During a 100 m sprint which of the following is used by the muscle for meeting energy demands?

Accepted Answer

Phosphocreatine

Answer

Phosphofructokinase

Answer

Glucose 1 - phosphate

Answer

Creatine phosphokinase

Question 8

A 40-year-old male presents with severe muscle weakness and cramping, and lab tests reveal elevated levels of lactic acid. Which metabolic pathway is most likely impaired?

Accepted Answer

Citric acid cycle

Answer

Glycolysis

Answer

Fatty acid oxidation

Answer

Gluconeogenesis

Question 9

In the electron transport chain, electrons travel from which energy state to which energy state?

Accepted Answer

From high energy to low energy state

Answer

Two way

Answer

One way irrespective of the potential

Answer

From low to high redox potential

Question 10

Type IV complex of ETC is inhibited by

Accepted Answer

Cyanide

Answer

Antimycin

Answer

Oligomycin

Answer

CO2

ATP as Energy Currency — MCQs

ATP as Energy Currency — MCQs

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