DAT - Dental Admission Biology: Cellular Metabolism Questions and Answers

Question 1

A scientist is studying a facultative anaerobe. Under which condition would the organism produce the most ATP per molecule of glucose?

Accepted Answer

In the presence of oxygen

Answer

In the absence of oxygen, via lactic acid fermentation

Answer

In the absence of oxygen, via alcohol fermentation

Answer

The ATP yield is the same regardless of oxygen presence

Question 2

Which of the following correctly pairs a metabolic process with its primary cellular location in eukaryotes?

Accepted Answer

Krebs Cycle - Mitochondrial Matrix

Answer

Glycolysis - Mitochondrial Inner Membrane

Answer

Electron Transport Chain - Cytoplasm

Answer

Fermentation - Mitochondrial Matrix

Question 3

During strenuous exercise, muscle cells may switch to anaerobic respiration. What is the primary purpose of converting pyruvate to lactate in this process?

Accepted Answer

To regenerate NAD+ from NADH

Answer

To produce additional ATP through substrate-level phosphorylation

Answer

To directly generate more glucose for the muscles

Answer

To shuttle electrons directly to the electron transport chain

Question 4

A patient is found to have a genetic disorder that inactivates the enzyme phosphofructokinase-1 (PFK-1), a key regulatory enzyme in glycolysis. Which of the following metabolic consequences would be expected?

Accepted Answer

Increased rate of gluconeogenesis

Answer

Accelerated breakdown of glucose to pyruvate

Answer

Accumulation of fructose-1,6-bisphosphate

Answer

Decreased levels of glucose-6-phosphate

Question 5

In photosynthesis, the light-independent reactions (Calvin cycle) utilize which products from the light-dependent reactions?

Accepted Answer

ATP and NADPH

Answer

Water and photons

Answer

Oxygen and glucose

Answer

ADP and NADP+

Question 6

Which of the following is a key difference between glycolysis and gluconeogenesis?

Accepted Answer

Glycolysis produces ATP, while gluconeogenesis consumes ATP.

Answer

Glycolysis occurs in the cytoplasm, while gluconeogenesis occurs in the mitochondria.

Answer

Glycolysis is an anabolic process, while gluconeogenesis is a catabolic process.

Answer

Both pathways use the exact same enzymes but in reverse directions.