Hepatitis B
Among the hepatitis viruses, hepatitis B virus (HBV) is unique because:
What our notes say
- Among the hepatitis viruses, hepatitis B virus (HBV) is unique because: (Paediatrics end of 2nd semester exam (MBPE 4300): 5 October 2021, 50 MCQs)
- Acute infection with hepatitis B is ascertained by the following serological markers EXCEPT: (Paediatrics end of 2nd semester exam (MBPE 4300): 5 October 2021, 50 MCQs)
- Chronic hepatitis B and C are often silent for decades. (Internal Medicine CAT 1 (MBIM 6112), 2019/2020: gastroenterology and hepatology,)
- Immunological evidence of immunity to hepatitis B is the presence of: (Junior Clerkship in Internal Medicine (MBIM4100) main exam, Paper One: 31 Januar)
- Infection screening: HIV, syphilis, hepatitis B and malaria prevention, with immunisation (rubella, tetanus). (Reproductive Health 1 End of Trimester CAT: November 2018)
- Laboratory tests: haemoglobin, blood group and Rhesus, HIV, VDRL or syphilis, urinalysis, malaria and hepatitis B where indicated. (Reproductive Health 1 End of Trimester CAT: ectopic pregnancy, ANC and abortion )
Study material on Hepatitis B
- Hepatitis B and the approach to hepatitis
- Gastrointestinal and liver
- Internal Medicine CAT 1 (MBChB 4), 2022: liver, pancreas and bone marrow, 30 MCQs and 2 short answers
- Internal Medicine 4th Year 1st Semester CAT: HIV and the gut, liver disease and pancreatitis, 30 MCQs and 2 short answers
- Paediatrics Year 6 MBChB end of semester CAT: clinical case MCQs, 29 of 30 questions
- Junior Clerkship in Internal Medicine (MBIM4100) main exam, Paper One: 31 January 2024
- Paediatrics end of 2nd semester exam (MBPE 4300): 5 October 2021, 50 MCQs
- Paediatrics end of second semester exam (MBPE 4300): 4 October 2022, cardiology, hepatology and gastroenterology, 47 of 50 MCQs
- Medical Virology CAT 2024/2025 — MKU MBMM 3333 Questions & Answers
- Paediatrics main exam (MBPE 4300): 24 January 2022, Paper One, 100 MCQs, 2 short essays and 2 long essays
- Medical Virology CAT 2024/2025 — MKU MBMM 3333 MCQs with Answers
- Weekly Pathology Exam - May 15, 2026 (Sections B & C)
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Practice questions on Hepatitis B
A 62-year-old man with chronic hepatitis B develops hepatocellular carcinoma. Molecular studies reveal inactivation of p53. Which of the following best describes the normal role of p53 in preventing tumor development?
- It promotes cell cycle progression.
- It induces apoptosis in cells with DNA damage.
- It activates oncogenes.
- It inhibits DNA repair mechanisms.
Answer: B. p53 is a tumor suppressor protein that acts as a 'guardian of the genome.' In response to cellular stress, such as DNA damage, p53 can induce cell cycle arrest for repair or trigger apoptosis to eliminate damaged cells, thereby preventing the accumulation of mutations that could lead to cancer.
Hepatitis B virus has been associated with?
- Cimex species
- Xenopsylla species
- Pthirus species
- Tabanids species
- Steam bugs
Answer: A. Bed bugs (Cimex) have been linked with hepatitis B virus. ---
A 62-year-old man with chronic hepatitis B develops hepatocellular carcinoma. Molecular studies reveal inactivation of p53. Which of the following best describes the normal role of p53 in preventing tumor development?
- Inducing cell cycle arrest or apoptosis in response to DNA damage
- Promoting DNA repair
- Activating cellular differentiation
- Stimulating immune surveillance against tumor cells
Answer: A. p53 is a crucial tumor suppressor gene that acts as a 'guardian of the genome.' In response to cellular stress, such as DNA damage, p53 can halt the cell cycle to allow for repair or induce apoptosis if the damage is irreparable, thereby preventing the accumulation of mutations that can lead to cancer.
A 62-year-old man with chronic hepatitis B develops hepatocellular carcinoma. Molecular studies reveal inactivation of p53. Which of the following best describes the normal role of p53 in preventing tumor development?
- Induces cell cycle arrest and apoptosis in response to DNA damage
- Promotes DNA repair
- Stimulates cell proliferation
- Mediates immune surveillance
Answer: A. p53 is a critical tumor suppressor gene. Its normal function is to sense DNA damage and trigger appropriate cellular responses, such as cell cycle arrest to allow for repair or induction of apoptosis if the damage is irreparable. Inactivation of p53 removes this crucial protective mechanism, allowing damaged cells to proliferate and accumulate further mutations.
A 62-year-old man with chronic hepatitis B develops hepatocellular carcinoma. Molecular studies reveal inactivation of p53. Which of the following best describes the normal role of p53 in preventing tumor development?
- Promotes cell growth and division
- Initiates DNA repair or induces apoptosis
- Stimulates angiogenesis
- Facilitates metastasis
Answer: B. The p53 protein is a crucial tumor suppressor. It acts as a 'guardian of the genome' by sensing DNA damage and cellular stress. In response, p53 can either initiate DNA repair mechanisms or, if the damage is too severe, trigger programmed cell death (apoptosis) to eliminate potentially cancerous cells. Inactivation of p53 allows cells with damaged DNA to survive and proliferate, leading to tumor development.
A 62-year-old man with chronic hepatitis B develops hepatocellular carcinoma. Molecular studies reveal inactivation of p53. Which of the following best describes the normal role of p53 in preventing tumor development?
- It acts as a cell cycle checkpoint, inducing apoptosis or cell cycle arrest in response to DNA damage
- It is a proto-oncogene that promotes cell growth
- It facilitates DNA repair by initiating transcription of repair enzymes
- It regulates cell adhesion and migration
Answer: A. p53 is a critical tumor suppressor gene often referred to as the 'guardian of the genome'. Its normal function is to detect DNA damage and trigger cellular responses, such as cell cycle arrest to allow for repair or induction of apoptosis if the damage is irreparable, thus preventing the propagation of mutations that could lead to cancer.