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BMS3031 - Molecular mechanisms of disease - S1 2026
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In the graph below each symbol represents a distinct district or borough. What does the data in the figure above indicate?
Accurate chromosome segregation during meiosis relies on the integrity of the meiotic spindle and the presence of cohesin proteins that hold sister chromatids together. Age‑related deterioration of these mechanisms is a major contributor to aneuploidy in human oocytes.
Which of the following changes is most likely to
cause chromosomal misalignment during meiosis?
Human oocytes initiate meiosis during fetal life and arrest for decades before completing cell division. This prolonged arrest underlies the maternal‑age–related increase in aneuploidy observed in human embryos.
Which statement best reflects the timing and regulation of meiotic divisions in human oocytes?
What does the graph below indicate about the success of IVF cycles?
Fetuses affected by chronic placental insufficiency often exhibit “brain‑sparing” blood flow redistribution. MRI studies in late gestation and early postnatal life, however, demonstrate altered neural connectivity and tissue composition compared with appropriately grown peers.
Which outcome most accurately reflects the
neurological impact of fetal growth restriction despite adaptive redistribution
of blood flow?
A fetus is referred for further assessment after third‑trimester ultrasound suggests abnormal sulcation patterns, but acoustic shadowing from the maternal pelvis limits visualization. Doppler studies and biometric measurements are otherwise reassuring. The clinician considers whether an alternative imaging modality would provide clinically meaningful additional information.
In this context, ultrasound assessment is most
clearly surpassed by fetal MRI in evaluating which aspect of fetal development?
A growth‑restricted fetus demonstrates abnormal uterine artery Doppler flow and reduced placental transport surface area on post‑delivery histology. Despite adequate maternal nutrition and absence of fetal genetic abnormalities, fetal growth remains compromised.
Which statement best captures the causal
relationship between fetal growth restriction and placental insufficiency in
this scenario?
Several prenatal tests are available to evaluate fetal genetic and developmental status. Some rely on placental or maternal proxies, while others sample compartments containing products of fetal metabolism or excretion. The distinction becomes especially important when mosaicism or confined placental abnormalities are suspected.
Which of the following procedures most directly assesses a developing fetus?
What does the graph below indicate about nephron number and birth weight?
In the graph above P = protein, C = carbohydrates and F = fat. This data comes from a study on rats that were subjected to fetal growth restriction.
Pregnant mice were fed one of the two diets, indicated in the diagram above, and the nephron number in the kidneys of their offspring was determined. What can we conclude about the impact of the maternal diet on the nephron number of the rat offspring?