Biochemical Pathway Fundamentals Quiz

Explore fundamental biochemical pathways with 17 challenging questions on energy currency, enzyme actions, metabolic cycles, and more!

#1

Which molecule is the primary energy currency of the cell?

DNA
ATP
RNA
NADH
#2

What is the rate-limiting enzyme in the de novo synthesis of fatty acids?

Fatty acid synthase
Acetyl-CoA carboxylase
Malonyl-CoA decarboxylase
Carnitine palmitoyltransferase I
#3

What is the role of biotin in cellular metabolism?

Carrier of electrons in the electron transport chain
Cofactor for enzymes involved in fatty acid synthesis
Activator of glycogen phosphorylase
Substrate for the Krebs cycle
#4

What is the primary function of the enzyme catalase in cells?

Glycolysis
Oxidative phosphorylation
Detoxification of hydrogen peroxide
DNA replication
#5

In glycolysis, which enzyme catalyzes the conversion of 3-phosphoglycerate to 2-phosphoglycerate?

Hexokinase
Phosphofructokinase
Enolase
Phosphoglycerate mutase
#6

What is the first step in glycolysis?

Glucose-6-phosphate formation
Glucose phosphorylation
Pyruvate formation
Fructose-1,6-bisphosphate formation
#7

Which enzyme is responsible for breaking down glycogen to glucose in glycogenolysis?

Glycogen synthase
Phosphorylase kinase
Glycogen phosphorylase
Hexokinase
#8

Which vitamin is essential for the synthesis of collagen in the body?

Vitamin A
Vitamin C
Vitamin D
Vitamin E
#9

What is the primary function of the electron transport chain in cellular respiration?

ATP synthesis
Glycolysis
Pyruvate formation
Krebs cycle
#10

Which of the following is an essential amino acid?

Alanine
Aspartic acid
Leucine
Glutamine
#11

During anaerobic glycolysis, what is the fate of pyruvate?

Converted to acetyl-CoA
Converted to lactate
Enters the Krebs cycle
Excreted as is
#12

In which cellular compartment does the Krebs cycle occur?

Nucleus
Mitochondria
Endoplasmic reticulum
Cytosol
#13

Which of the following is a product of the pentose phosphate pathway?

Glucose-6-phosphate
Pyruvate
Ribose-5-phosphate
Fructose-1,6-bisphosphate
#14

In gluconeogenesis, which enzyme catalyzes the conversion of pyruvate to phosphoenolpyruvate?

Pyruvate carboxylase
Phosphoenolpyruvate carboxykinase
Fructose-1,6-bisphosphatase
Glucose-6-phosphatase
#15

Which of the following is a key regulatory enzyme in the citric acid cycle (Krebs cycle)?

Isocitrate dehydrogenase
Citrate synthase
Malate dehydrogenase
Fumarase
#16

Which enzyme is responsible for converting ribonucleotides to deoxyribonucleotides in DNA synthesis?

DNA polymerase
RNA polymerase
Thymidylate synthase
Ribonuclease
#17

In which phase of the cell cycle does DNA replication occur?

G1 phase
S phase
G2 phase
M phase

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