Free NLN NEX Practice Exam with Questions & Answers | Set: 4

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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An ionic bond forms when one atom completely transfers one or more electrons to another atom. This typically occurs between a metal and a nonmetal, resulting in the formation of positively and negatively charged ions that attract each other. In contrast, covalent bonds involve sharing of electrons. Non-polar covalent bonds share electrons equally, while polar covalent bonds share electrons unequally. Hydrogen bonds are weak attractions between molecules, not true electron-sharing or transfer bonds. The NEX Science exam frequently assesses basic chemistry principles related to bonding and molecular interactions. Because only ionic bonds involve a complete transfer of electrons, option D is correct.

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To maintain something means to keep it at the same level or preserve it. Option C is correct. Understanding everyday academic vocabulary is critical for the NEX verbal section.

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The correct answer must be directly supported by the information in the passage. The passage clearly explains that sleep helps the brain process and store information, which is essential for memory consolidation. It also states that lack of sleep negatively affects cognitive abilities such as judgment and reaction time. Therefore, the conclusion that memory formation is affected by sleep is well supported. Option A is incorrect because the passage emphasizes mental and cognitive effects, not just physical health. Option C is directly contradicted by the passage’s mention of impaired functioning due to lack of sleep. Option D exaggerates the information; while sleep affects academic performance, the passage does not claim it is the sole factor. On the NEX exam, supported-conclusion questions require selecting an answer that is neither too extreme nor unsupported by the passage.

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The passage emphasizes the importance of clear communication between healthcare professionals and patients. It explains that when communication is poor, negative consequences such as medication errors and missed appointments can occur, ultimately affecting health outcomes. These supporting details all point to one central idea: effective communication in healthcare is essential for positive patient outcomes. Option B accurately summarizes this main idea. Option A shifts responsibility entirely to patients, which is not stated. Option C focuses on one consequence rather than the overall message. Option D is incorrect because the passage implies errors can be prevented with better communication. On the NEX exam, main-idea questions require identifying the broad message supported by multiple details rather than focusing on a single example.

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Temporary refers to something lasting for a short period of time. Option B correctly reflects this meaning. Recognizing time-related descriptors is common on the NEX exam.

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The passage explains that vaccines stimulate the immune system so it can recognize pathogens and respond more quickly in the future. This means vaccines act as a training mechanism for the immune system. Option C correctly reflects this explanation. Option A is incorrect because vaccines do not eliminate all bacteria permanently. Option B is the opposite of what the passage states, as vaccines strengthen immune response. Option D is incorrect because vaccines are preventive, not treatments administered after symptoms appear. NEX reading comprehension questions often test understanding of scientific processes explained in simple language, and correct answers usually restate information using different wording rather than introducing new ideas.

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“Reluctant” describes someone who is unwilling or hesitant to act. Option C best matches this meaning. The other options suggest eagerness or readiness, which are opposites. Context clues on the NEX often rely on emotional tone.

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“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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The passage emphasizes that preventive screenings allow health problems to be identified before symptoms appear. Option C accurately reflects this benefit. The other options are either incorrect or exaggerated. On the NEX exam, benefit questions often focus on early intervention and prevention themes.

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