Energy Metabolism I | Biology | Quiz

1. Sir Hans Adolf Krebs is most famous for

discovering that glucose was a main source of fuel in animals.

discovering the glycolysis pathway.

inventing the manometer.

discovering the main biochemical pathway by which cells break down food for energy.

2. Which is true of enzymes?

Enzymes break down chemical compounds.

Enzymes work in an assembly line fashion.

Enzymes build up new molecules from simpler compounds.

All of the answers are true.

3. Any enzyme can break down any chemical compound.

true

false

4. Energy metabolism

occurs in the mitochondria of cells.

proceeds in a straightforward linear fashion.

does not require enzymes.

bypasses the Krebs cycle.

5. Heinrich Warburg is credited with

figuring out the steps of the glycolysis pathway.

discovering the citric acid cycle.

inventing the manometer.

discovering the urea cycle.

6. When Hans Adolf Krebs and Kurt Henseleit discovered the urea cycle, it was clear that the pathway from ammonia to urea was a cycle because

ornithine was recreated.

no amino acids were involved in the process.

the process bypassed the liver.

ammonia levels continue to build up in the body.

7. Glycolysis is a biological process that

builds glucose molecules from smaller pyruvate molecules.

splits one glucose molecule into two pyruvate molecules.

requires oxygen.

does not require enzymes.

8. When no oxygen is available, pyruvate is converted to

lactic acid.

muscle cells.

glucose.

oxygen.

9. Which of the following is NOT true of the Krebs Cycle?

Acetate is the needed substrate to allow the Krebs cycle to proceed.

Citrate stays in the same molecular form throughout the entire cycle.

Co-enzyme A (Co-A) performs a key role as a carrier molecule that escorts the tiny acetate molecule around the cell.

Some of the carbon that is freed in the process forms CO₂.

10. Our cells most commonly store energy in the form of

glucose.

enzymes.

ATP.

GTP.