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| Section | Weight | Objectives |
|---|---|---|
| Mathematics | 28% | - Data & Information
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| Science | 38% | - Human Anatomy & Physiology
|
| Verbal Ability | 34% | - Word Knowledge
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24. Frage
The thymus, lymph nodes, and spleen are all organs of which system?
Antwort: B
Begründung:
The thymus, lymph nodes, and spleen are key components of the immune system. The immune system is responsible for defending the body against pathogens such as bacteria, viruses, and other foreign invaders.
The thymus plays an important role in the maturation of T lymphocytes (T cells), which are critical for adaptive immunity. Lymph nodes filter lymphatic fluid and trap pathogens, allowing immune cells to recognize and respond to infections. The spleen filters blood, removes old or damaged red blood cells, and helps initiate immune responses to blood-borne pathogens. While the endocrine system regulates hormones, the cardiovascular system transports blood, and the integumentary system protects the body externally, none of these systems include the thymus, lymph nodes, and spleen as primary organs. The NEX Science exam often tests system identification by grouping organs with shared functions, making the immune system the correct choice.
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25. Frage
Which of the following bones form the ball-and-socket joint of the upper extremity?
Antwort: C
Begründung:
The ball-and-socket joint of the upper extremity is the shoulder joint. This joint is formed by the head of the humerus (the ball) fitting into the glenoid cavity of the scapula (the socket). This structure allows for a wide range of motion, including flexion, extension, abduction, adduction, and rotation. The ribs do not participate in this joint, and the clavicle connects the scapula to the sternum but does not form the ball-and-socket articulation. Understanding joint structure and function is important for anatomy questions on the NEX Science exam. The shoulder joint's design allows greater mobility than stability, which explains why shoulder dislocations are relatively common.
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26. Frage
The first recovery phase for a patient after surgery is walking for 12 weeks. The second recovery phase, beginning at 13 weeks post-surgery, is 16 sessions with a physical therapist.
If the patient visits the physical therapist twice a week, how many weeks does it take to complete both recovery phases?
Antwort: D
Begründung:
This problem combines time duration and rate, commonly tested on the NEX. The first recovery phase lasts
12 weeks. The second phase consists of 16 physical therapy sessions, attended twice per week. To determine the length of the second phase, divide the total sessions by the weekly rate: 16 ÷ 2 = 8 weeks. The second phase begins at week 13, meaning it starts after the first 12 weeks are completed. The total recovery time is therefore 12 weeks for phase one plus 8 weeks for phase two, equaling 20 weeks of active recovery time.
However, because phase two starts at week 13 and extends 8 full weeks forward on the calendar, the total span from the beginning of recovery to the end of therapy is 28 weeks. NEX questions frequently test careful reading of timelines, not just arithmetic. Option B correctly reflects the full duration from start to finish.
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27. Frage
What is the term for organisms that are preserved for thousands of years by being buried in sediment, encased in amber, or frozen in ice?
Antwort: A
Begründung:
Fossils are the preserved remains or traces of organisms that lived in the past. Fossilization can occur in several ways, including burial in sediment, preservation in amber, or freezing in ice. These conditions prevent decay and allow organisms or parts of organisms to remain intact for thousands or even millions of years.
Fossils provide critical evidence for understanding evolution, extinct species, and changes in life on Earth over time. The terms remnants, ancestors, and relics are not scientifically precise terms used to describe preserved organisms in geology or biology. The NEX Science section often focuses on basic concepts of evolution and Earth history, making fossil identification an important topic.
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28. Frage
What are the inherited factors transmitted in an organism from generation to generation called?
Antwort: A
Begründung:
Inherited factors that are passed from parents to offspring are known as an organism's genotype. The genotype refers to the genetic makeup of an organism, including the specific alleles inherited for each trait.
Heterozygote and homozygote describe specific combinations of alleles but do not refer to inherited factors as a whole. Phenotype refers to the observable traits of an organism, which result from the interaction between genotype and environment. The NEX Science exam often tests the distinction between genotype and phenotype, emphasizing that genotype represents the genetic instructions while phenotype represents the physical expression of those instructions.
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29. Frage
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