What is a significant discovery from the Human Genome Project?
The genome is composed of approximately 1,000 genes.
Human genes produce three proteins per gene, unlike other mammals which produce only one.
All humans are 99.9% identical at the DNA level.
Single gene testing will become a standardized test for all patients in the future.
The Correct Answer is C
Choice A rationale:
Incorrect. The Human Genome Project revealed that humans have approximately 20,000-25,000 genes, not 1,000. This finding significantly expanded our understanding of the complexity of the human genome.
Choice B rationale:
Incorrect. The concept of one gene producing three proteins is not a discovery from the Human Genome Project. While some genes can produce multiple protein isoforms through alternative splicing, this is not a universal feature of human genes.
Choice C rationale:
Correct. This is a major finding from the Human Genome Project. It highlights that despite our apparent differences, humans share a remarkably high degree of genetic similarity. This finding has implications for understanding human evolution, disease susceptibility, and pharmacogenomics.
Key points:
The vast majority of our DNA is shared among all humans.
The small percentage of genetic variation accounts for individual differences and diversity.
This finding challenges previous notions of race and ethnicity based on genetic differences.
It emphasizes the common origins and shared heritage of all humans.
Choice D rationale:
Incorrect. While single gene testing has become more common for certain genetic disorders, it is unlikely to become a standardized test for all patients in the future. This is due to the complexity of human genetics and the diverse factors that contribute to health and disease.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Trisomy 21, also known as Down syndrome, is a genetic condition caused by the presence of an extra copy of chromosome 21.
The nuchal translucency test (NT) is a non-invasive ultrasound screening test that measures the thickness of the fluid-filled space at the back of a developing baby's neck.
Evidence suggests that fetuses with Down syndrome tend to have increased fluid accumulation in this area, resulting in a larger-than-average nuchal translucency measurement.
Therefore, an increased NT measurement can be a marker for an increased risk of Down syndrome.
It's important to emphasize that the NT test is a screening tool, not a diagnostic test.
This means it can only indicate an increased risk of Down syndrome; it cannot definitively diagnose the condition.
To confirm a diagnosis, further testing, such as chorionic villus sampling (CVS) or amniocentesis, is required.
Choice B rationale:
Neural tube defects (NTDs) are birth defects that affect the brain, spine, or spinal cord.
The most common NTDs are spina bifida and anencephaly.
The NT test is not a diagnostic test for NTDs, although it might detect some cases of open spina bifida.
However, it's not specifically designed for this purpose, and other tests, such as alpha-fetoprotein (AFP) screening or detailed ultrasound, are more reliable for diagnosing NTDs.
Choice C rationale:
The NT test is typically performed in the first trimester of pregnancy, between 11 and 14 weeks gestation.
It's not available in the second trimester because the nuchal translucency measurement becomes less reliable after this point in pregnancy.
Choice D rationale:
A nuchal translucency measurement of 3mm or less is generally considered normal.
Measurements greater than 3mm are associated with an increased risk of Down syndrome and other chromosomal abnormalities.
The higher the measurement, the greater the risk.
Correct Answer is B
Explanation
Answer and explanation
The correct answer is B. Aspiration of stomach contents.
Choice A rationale:
Respiratory depression is a potential risk of general anesthesia, but it is not the greatest risk in this scenario.
It is usually well-managed by the anesthesiologist during surgery.
They will closely monitor the patient's respiratory status and adjust the level of anesthesia as needed to maintain adequate breathing.
If respiratory depression does occur, it can be quickly reversed with medications.
Choice B rationale:
Aspiration of stomach contents is the most serious risk of general anesthesia in pregnant women.
This is because pregnancy causes a number of changes in the gastrointestinal system that increase the risk of aspiration:
The growing uterus puts pressure on the stomach, which can cause stomach contents to reflux into the esophagus.
Pregnancy hormones can relax the esophageal sphincter, which is the muscle that normally prevents food and stomach acid from coming back up the esophagus.
Labor can further delay gastric emptying, leading to a higher volume of stomach contents.
If stomach contents are aspirated into the lungs, it can cause a serious and potentially fatal condition called aspiration pneumonia.
It is important to note that aspiration can occur even if a woman has been fasting before surgery.
This is because the stomach never completely empties, and there is always some risk of reflux.
Choice C rationale:
Uterine relaxation is a potential side effect of some general anesthetic agents, but it is not a major risk in this scenario.
The anesthesiologist will choose an anesthetic agent that is less likely to cause uterine relaxation.
Additionally, they will closely monitor the patient's uterine tone and can administer medications to stimulate the uterus if necessary.
Choice D rationale:
Inadequate muscle relaxation is not a major risk of general anesthesia in this scenario.
The anesthesiologist will ensure that the patient's muscles are adequately relaxed to facilitate surgery.
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