USABO OPEN EXAM 2025 QUESTIONS AND CORRECT VERIFIED ANSWERS (GRADED A+)
GUARANTEED PASS
Integrins - (ANSWER)Cell surface receptors for extracellular matrix proteins.
Actin - (ANSWER)Protein involved in cell motility and muscle contraction.
Myosin - (ANSWER)Motor protein involved in muscle contraction and cytokinesis.
Dynein - (ANSWER)Motor protein involved in intracellular transport and ciliary/flagellar movement.
Kinesin - (ANSWER)Motor protein involved in intracellular transport and mitotic spindle formation.
Cyclin - (ANSWER)Regulatory protein involved in cell cycle control.
Extracellular matrix - (ANSWER)Non-cellular component providing structural support and biochemical
signaling to surrounding cells.
Cytokinesis - (ANSWER)Division of the cytoplasm following nuclear division.
pKa - (ANSWER)Negative base-10 logarithm of the acid dissociation constant.
Oxidative phosphorylation - (ANSWER)Process of ATP synthesis in mitochondria using oxygen as the final
electron acceptor.
Frederick Griffith - (ANSWER)Discovered transformation through pneumococcal bacteria.
Hershey and Chase - (ANSWER)Confirmed DNA as the hereditary material using bacteriophages.
Chargaff - (ANSWER)Discovered the complementary base pairing in DNA.
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GUARANTEED PASS
Integrins - (ANSWER)Cell surface receptors for extracellular matrix proteins.
Actin - (ANSWER)Protein involved in cell motility and muscle contraction.
Myosin - (ANSWER)Motor protein involved in muscle contraction and cytokinesis.
Dynein - (ANSWER)Motor protein involved in intracellular transport and ciliary/flagellar movement.
Kinesin - (ANSWER)Motor protein involved in intracellular transport and mitotic spindle formation.
Cyclin - (ANSWER)Regulatory protein involved in cell cycle control.
Extracellular matrix - (ANSWER)Non-cellular component providing structural support and biochemical
signaling to surrounding cells.
Cytokinesis - (ANSWER)Division of the cytoplasm following nuclear division.
pKa - (ANSWER)Negative base-10 logarithm of the acid dissociation constant.
Oxidative phosphorylation - (ANSWER)Process of ATP synthesis in mitochondria using oxygen as the final
electron acceptor.
Frederick Griffith - (ANSWER)Discovered transformation through pneumococcal bacteria.
Hershey and Chase - (ANSWER)Confirmed DNA as the hereditary material using bacteriophages.
Chargaff - (ANSWER)Discovered the complementary base pairing in DNA.
1
