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| Section | Weight | Objectives |
|---|---|---|
| Mathematics | 28% | - Numbers and Operations
|
| Science | 38% | - Chemistry
|
| Verbal Ability | 34% | - Reading Comprehension
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問題 #86
Which structure works to prevent reflux of gastric contents by contracting and relaxing?
答案：A
解題說明：
The lower esophageal sphincter (LES) is a ring of smooth muscle located at the junction between the esophagus and the stomach. Its primary function is to prevent gastric contents, including acid, from flowing back into the esophagus. The LES contracts to keep the stomach contents contained and relaxes to allow food to enter the stomach during swallowing. Dysfunction of the LES can lead to gastroesophageal reflux disease (GERD). The esophageal muscularis helps move food, the upper esophageal sphincter controls entry into the esophagus, and the angle of His is an anatomical feature rather than a muscular valve. The NEX Science exam frequently tests digestive system physiology and reflux prevention mechanisms.
問題 #87
Reading Comprehension
Passage:
Balanced nutrition includes consuming a variety of foods to obtain essential vitamins and minerals. Diets lacking in key nutrients can lead to deficiencies, fatigue, and impaired body function.
What is the main purpose of the passage?
答案：D
解題說明：
The passage focuses on the importance of balanced nutrition and the need to consume a variety of foods to maintain health. It warns that diets lacking essential nutrients can cause health problems. Option B accurately summarizes the purpose of the passage. Option A is incorrect because supplements are not discussed. Option C is unrelated, and option D contradicts the message of balance. On the NEX exam, purpose questions require identifying the author's intent rather than focusing on minor details.
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問題 #88
Word Knowledge
The word"accurate"most nearly means:
答案：C
解題說明：
"Accurate" means correct or free from error. Option B is the best synonym. The other options describe inaccuracy or uncertainty. Accuracy is a high-frequency NEX vocabulary word, especially in healthcare contexts.
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問題 #89
During translation, the cell produces proteins by using information from
答案：B
解題說明：
Translation is the process by which proteins are synthesized at the ribosome. During this process, the genetic code carried by messenger RNA (mRNA) is read in groups of three nucleotides called codons. Each codon specifies a particular amino acid, which is added to a growing protein chain. Transfer RNA (tRNA) brings amino acids to the ribosome but does not contain the original instructions. Ribosomal RNA (rRNA) forms the structural and functional core of the ribosome, and siRNA is involved in gene silencing rather than protein synthesis. Because mRNA carries the direct genetic instructions copied from DNA during transcription, it is the correct source of information used during translation. The NEX Science section frequently tests understanding of the central dogma of molecular biology: DNA # RNA # protein.
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問題 #90
Milk, pure water, lemon juice, and gastric juice were tested using a pH meter. Results are summarized in the chart below.
Substance | pH
Milk | 6.8
Pure water | 7
Lemon juice | 2
Gastric juice | 1
Which substance is the most acidic?
答案：D
解題說明：
The pH scale measures acidity and alkalinity, ranging from 0 to 14. Lower pH values indicate higher acidity, while higher pH values indicate greater alkalinity. A pH of 7 is considered neutral. In the chart provided, gastric juice has a pH of 1, which is the lowest value listed, making it the most acidic substance. Lemon juice, with a pH of 2, is also acidic but less so than gastric juice. Milk is slightly acidic, and pure water is neutral.
Gastric juice contains hydrochloric acid, which aids digestion and destroys harmful microorganisms in the stomach. The NEX Science exam frequently tests understanding of the pH scale and its physiological relevance, particularly in digestive processes.
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問題 #91
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