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| Section | Objectives |
|---|---|
| Verbal Skills | - Language Usage
|
| Science | - Basic Chemistry
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| Mathematics | - Word Problems
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NEW QUESTION # 12
The diagram below shows the rough endoplasmic reticulum of a cell as seen under the electron microscope.
The structures labeled Z are the site of protein synthesis.
Z is indicating
Answer: C
Explanation:
This question focuses on cell structure and function. The rough endoplasmic reticulum (RER) is characterized by the presence of small, dark granules attached to its surface. These granules are ribosomes. Ribosomes are the cellular structures responsible for protein synthesis, as they translate messenger RNA into amino acid chains. The presence of ribosomes gives the rough endoplasmic reticulum its "rough" appearance under an electron microscope. Mitochondria are involved in energy production, centrosomes play a role in cell division, and chromosomes contain genetic material within the nucleus. None of these structures are responsible for protein synthesis on the surface of the RER. The NEX Science exam frequently includes diagrams requiring students to identify organelles and link them to their functions. Recognizing ribosomes as the site of protein synthesis is a fundamental concept in cell biology.
NEW QUESTION # 13
Reading Comprehension
Passage:
Older adults may be at increased risk for falls due to decreased balance, vision changes, and muscle weakness.
Preventive measures such as exercise and home safety modifications can reduce fall risk.
What is the main purpose of the passage?
Answer: A
Explanation:
The passage discusses both causes of falls in older adults and strategies to prevent them. Option B accurately summarizes this purpose. The other options focus on details not emphasized. Purpose questions on the NEX often involve identifying both the problem and the proposed solution.
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NEW QUESTION # 14
In which biochemical family do starch and glycogen belong?
Answer: C
Explanation:
Starch and glycogen are both polysaccharides, which are complex carbohydrates composed of many glucose units. Starch is the primary storage form of glucose in plants, while glycogen is the storage form of glucose in animals, particularly in the liver and muscles. Carbohydrates serve as a major energy source for cells. Nucleic acids store genetic information, proteins perform structural and enzymatic functions, and lipids are involved in energy storage and membrane structure. The NEX Science exam often tests classification of biomolecules and their functions, making carbohydrates the correct answer.
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NEW QUESTION # 15
In the human male, which of these structures produces sperm cells?
Answer: D
Explanation:
Sperm cells are produced in thetestes, specifically within tightly coiled structures called seminiferous tubules.
The process of sperm production is known as spermatogenesis and requires hormones such as testosterone.
Cowper's glands and the prostate gland do not produce sperm; instead, they secrete fluids that contribute to semen and help protect and nourish sperm cells. The epididymis is responsible for sperm maturation and storage but does not produce sperm. The NEX Science exam often tests reproductive anatomy by asking students to distinguish between sperm production, maturation, and transport. Understanding the specific role of each male reproductive structure is essential. Since only the testes are responsible for the formation of sperm cells, option C is the correct answer.
NEW QUESTION # 16
Which of these responses is an example of a simple negative feedback response in the body?
Answer: C
Explanation:
Negative feedback occurs when a change in a physiological variable triggers a response that counteracts the initial change, helping maintain homeostasis. When blood glucose levels rise, the pancreas releases insulin, which promotes glucose uptake by cells and lowers blood glucose back to normal levels. This is a classic example of negative feedback. Option B is incorrect because thyroxine increases metabolism, not decreases it.
Options A and D do not clearly demonstrate a direct feedback loop restoring balance. The NEX Science exam often highlights glucose regulation as a key example of negative feedback because it clearly illustrates cause- and-effect relationships within endocrine control systems.
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NEW QUESTION # 17
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