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Question 1
Which cyclin-dependent kinase (CDK) complex is primarily responsible for phosphorylating the retinoblastoma protein (pRb) to drive the cell cycle transition from G1 into S phase?
Correct Answer:
Cyclin D - CDK4/6
Question 2
In the intrinsic (mitochondrial) apoptosis pathway, which event directly triggers the assembly of the apoptosome in the cytosol?
Correct Answer:
Release of cytochrome c from mitochondria and its binding to Apaf-1
Question 3
Which adaptor protein is directly recruited to death receptors (such as Fas/CD95 and TRAIL-R1/R2) to form the Death-Inducing Signaling Complex (DISC) during extrinsic apoptosis?
Correct Answer:
FADD (Fas-Associated Death Domain)
Question 4
What is the primary mechanism by which approximately 85% to 90% of human malignant tumors maintain telomere length to achieve replicative immortality?
Correct Answer:
Reactivation or transcriptional upregulation of telomerase reverse transcriptase (TERT)
Question 5
Under normoxic cellular conditions, how is the alpha subunit of hypoxia-inducible factor 1 (HIF-1alpha) targeted for rapid proteasomal degradation?
Correct Answer:
Hydroxylation of specific proline residues by prolyl hydroxylase domain (PHD) proteins, facilitating binding to pVHL
Question 1
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About this Exam

Prepare with the Arab Board Oncology Part 1 Practice Questions - Arab Board Medical Oncology Primary (Part 1) Written Examination - الامتحان الأولي لاختصاص طب الأورام (ABHS) Exam practice quiz. This question bank includes 100 questions covering primary, mechanism, cell, tumor, and cancer. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Arab Board Oncology Part 1 Practice Questions - Arab Board Medical Oncology Primary (Part 1) Written Examination - الامتحان الأولي لاختصاص طب الأورام (ABHS) Exam

This practice set contains 100 questions from the matching question bank and focuses on primary, mechanism, cell, tumor, and cancer. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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