NBME - NEW TESTS (POSSIBLE 2024 QUESTIONS AND ANSWERS)
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NBME - NEW TESTS (POSSIBLE 2024 QUESTIONS AND ANSWERS)-A 2 year old girl who is exposed to the sun has progressive development of dryness of the skin, excessive freckling, and keratoses. Skin fibroblasts cultured from this child are most likely to be defective in which of the following?
- Nuclear...
NBME - NEW TESTS (POSSIBLE 2024 QUESTIONS AND ANSWERS)
A 2 year old girl who is exposed to the sun has progressive development of dryness
of the skin, excessive freckling, and keratoses. Skin fibroblasts cultured from this
child are most likely to be defective in which of the following?
- Nuclear excision repair of pyrimidine dimers
a 65 year old man has a radical prostacetomy and lymph node dissection for
adenocarcinoma of the prostate. which of the following features is involved in the
grading of this neoplasm
- Tumor size
A man with a fair complexion develops an ulcerated nodule on his face after
prolonged exposure to sunlight. Examination of tissue obtained on excision of the
nodule shows invasive squamous cell carcinoma. Which of the following types of
DNA damage is most likely responsible for this leason?
- Pyrimidine dimers
A 45 year old woman with cancer is undergoing an intensive 2 week course of
chemotherapy with vinblastine. Which of the following changes is most likely to
occur by the end of this treatment?
- Decreased number of neutrophils - vinblastin mechanism is to bind microtubular
proteins in the mitotic spindle, thereby preventing cell division during metaphase.
(anaphase promoting complex inhibitor)
An 11 year old boy has had pain in his right mid thigh for 2 weeks. Physical
examination shows an area of warmth and tenderness around an ill defined mass. X
ray of the femure shows a solitary mid diaphyseal osteolytic lesion with
permeative margins. The lesion is surrounded by concentric layers of reactive
bone. Tissue obtained on biosy of the mass is composed of poorly differentiated
sheets of small, uniform, hyperchromatic cells with a very high nuclear
cytoplasmic ratio, scant stroma, and no visible matrix. Which of the following is
the most likely diagnosis?
,- Ewing sarcoma - Ewing sarcoma is a type of cancer that may be a bone sarcoma
or a soft-tissue sarcoma. Symptoms may include swelling and pain at the site of the
tumor, fever, and a bone fracture.
a 55 year old woman with colon cancer and a healthy 55 year old woman are
participating in a study of colon cancer. malignant cells are obtained from the
tumor in the affect patient, and normal colonic epithelial cells are procured from
the healthy subject. After both cell tpyes are treated with transforming growth
factor B, the number of normal cells decreases whereas the number of tumor cells
remains unchanged. The tumor cells most likely express a mutation that inhibits
which of the following physiological processes.
- Apoptosis
A 10 month old boy has an abdominal mass noted during a routine physical
examination. Abdominal ultrasonography shows a 10 cm solid mass on the upper
pole of the left kidney. Angiographically, the mass is hypervascular. Which of the
following is the most likely diagnosis?
- Nephroblastoma (Wilms Tumor)
A 52 year old man comes to the physician because of a 3 month hisotry of
epigastric abdominal painl; he used to live in japan, is a smokr and drinks three to
four glasses of wine daily. Physical exam shows epigastric tenderness. Upper
gastrointestinal endoscopy shows a 4 cm ulcer in the stomach. Examination of a
biosy specimen of the lesion confirms adenocarinoma. Which of the following is
the strongest predisposing risk factor for the patient's condition?
- Diet
An investigator conducts a study of the molecular basis of von Hippel lindau
disease, specifically the role of the VHL protein in the disease process. The protein
forms part of a ubiquitin ligase complex (E3) that targets hypoxia- inducible factor
-1. The pathway is shown in the diagram. Step IV most likely involves which of
the following organelles?
- Proteasome
, A 28 year old man is diagnosed with advanced testicular cancer. Combination
chemotherapy is being considered. Cisplatin is included in the regimen because of
its effect on which of the following?
- DNA
A study is conducted of breast cancer cell invasion of surrounding tissues and
metastasis. Two breast cancer cell lines, in the presence and absence of
macrophages are analyzed. The macrophages are found to secrete a protein that is
essential for invasion and metastasis. This protein is most likely which of the
following?
- Metalloproteinases (MMPS)
An investigator is studying the effect of paclitaxel on the growth of breast cancer
cells. The investigator observes that the drug binds to microtubules. This binding
will interfere with the completion of which of the following stages of the cell
cycle?
- M phase
A 3 year old boy is brought to the physician because of episodes of sunburn after
brief sun exposure during the past 18 months. Typically, the sunburn persisted for
more than 2 weeks. A 12 year old cousin has basal cell carinoma. Physical
examination shows numerous freckles and erythamatous, scaly, rough macules in
sun exposed areas. Anaylsis of cultered skin fibroblasts shows a tenfold increased
sensitivity to ultraviolet radiation compared with standard human fibroblasts.
which of the following DNA lesions is the most likely cause of the findings in this
patient?
- Formation of thymidine dimers
A 75 year old woman is diagnosed with ovarian cancer. Immunohistochemical
analysis of an ovarian biopsy specimen shows marked overexpression of
phosphorylated Akt protein. In addition, concentrations of BCL2 mRNA and
protein in the specimen are increased 10 times compared with the referance range.
based on these results, which of the following is most likely regarding the tumor
cells in the patient?
- Resistance to apoptosis
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