#1
Which molecule is considered the universal energy currency in cells?
ATP
ExplanationATP is used as energy currency in various cellular processes.
#2
In glycolysis, glucose is converted into which compound?
Pyruvate
ExplanationPyruvate is the end product of glycolysis.
#3
Which organelle is responsible for cellular respiration?
Mitochondria
ExplanationMitochondria are the sites of cellular respiration.
#4
Which of the following is a product of the pentose phosphate pathway?
NADPH
ExplanationNADPH is generated in the pentose phosphate pathway and is essential for biosynthetic processes.
#5
In which cellular compartment does beta-oxidation of fatty acids occur?
Mitochondria
ExplanationBeta-oxidation of fatty acids occurs in the mitochondria.
#6
Which molecule is the starting substrate for gluconeogenesis?
Glycerol
ExplanationGlycerol can be converted to glucose via gluconeogenesis.
#7
What is the primary function of the enzyme catalase in cells?
Detoxification of hydrogen peroxide
ExplanationCatalase breaks down hydrogen peroxide into water and oxygen.
#8
Which of the following is a characteristic of anaerobic respiration?
Occurs in the absence of oxygen
ExplanationAnaerobic respiration occurs in the absence of oxygen.
#9
Which metabolic pathway is responsible for the conversion of amino acids to glucose?
Gluconeogenesis
ExplanationGluconeogenesis converts non-carbohydrate precursors like amino acids to glucose.
#10
What is the primary function of the enzyme hexokinase in glycolysis?
Convert glucose to glucose-6-phosphate
ExplanationHexokinase catalyzes the conversion of glucose to glucose-6-phosphate in glycolysis.
#11
In the context of cellular respiration, what is the role of NADH?
Donate electrons in the electron transport chain
ExplanationNADH donates electrons to the electron transport chain, leading to ATP production.
#12
What is the primary function of the enzyme phosphofructokinase-1 in glycolysis?
Convert glucose-6-phosphate to fructose-1,6-bisphosphate
ExplanationPhosphofructokinase-1 catalyzes an early, irreversible step in glycolysis.
#13
What is the primary function of the Krebs cycle (Citric Acid Cycle)?
Production of ATP
ExplanationThe Krebs cycle generates ATP and other energy carriers.
#14
Which enzyme is responsible for converting ADP to ATP during oxidative phosphorylation?
ATP synthase
ExplanationATP synthase synthesizes ATP from ADP and inorganic phosphate.
#15
What is the final electron acceptor in the electron transport chain during aerobic respiration?
Oxygen
ExplanationOxygen serves as the terminal electron acceptor in aerobic respiration.
#16
What is the primary function of the pentose phosphate pathway?
Nucleotide synthesis
ExplanationThe pentose phosphate pathway generates ribose-5-phosphate for nucleotide synthesis.
#17
During which phase of cellular respiration is carbon dioxide produced?
Krebs cycle
ExplanationCarbon dioxide is produced during the Krebs cycle.
#18
What is the main function of the electron transport chain in cellular respiration?
Generate ATP
ExplanationThe electron transport chain generates ATP by oxidative phosphorylation.
#19
During which phase of cellular respiration is water produced?
Electron transport chain
ExplanationWater is produced during the electron transport chain as oxygen is reduced.
#20
Which molecule is often referred to as the 'entry point' into glycolysis?
Glucose-6-phosphate
ExplanationGlucose-6-phosphate is the entry point into glycolysis.