Nursing Elites

1. Which of the following correctly matches a category of protein with a physiological example?

• A. Keratin is a structural protein
• B. Antigens are hormonal proteins
• C. Channel proteins are marker proteins
• D. Actin is a transport protein

Correct answer: A

Rationale: Keratin is indeed a type of structural protein found in the skin, hair, and nails of animals. It provides strength and protection, helping to maintain the overall structure of these tissues. The other choices are incorrect as antigens are not hormonal proteins but rather are involved in immune response, channel proteins are involved in facilitating the transport of ions or molecules across cell membranes, and actin is primarily involved in cell structure and movement, not as a transport protein.

2. Which of the following most accurately describes the author's main conclusion?

• A. Leif Erikson is a legendary Viking explorer.
• B. Leif Erikson deserves more credit for exploring America.
• C. Spreading Christianity motivated Leif's expeditions.
• D. Leif Erikson contacted the natives nearly five hundred years before Columbus.

Correct answer: B

Rationale: The correct answer is B: 'Leif Erikson deserves more credit for exploring America.' The author's main conclusion, as supported by the extract, is that Leif Erikson should receive more credit for his contributions in exploring the New World. Choice A is incorrect as it does not capture the essence of the author's conclusion, which is about recognizing Erikson's achievements rather than just labeling him as a legendary explorer. Choice C is incorrect because while Leif Erikson did convert to Christianity, the primary focus of the conclusion is on his exploration rather than his motivations. Choice D is incorrect as it only mentions one aspect of Erikson's achievements (contacting the natives) and does not encompass the broader idea of giving him more credit for his explorations.

3. What is the ultimate end product of glucose breakdown in glycolysis?

• A. ATP
• B. NADPH
• C. Pyruvic acid
• D. Oxygen

Correct answer: C

Rationale: The ultimate end product of glucose breakdown in glycolysis is pyruvic acid. During glycolysis, glucose is broken down into pyruvic acid through a series of enzymatic reactions. ATP is produced as an energy carrier during glycolysis, but it is not the final end product. NADPH is not a direct product of glycolysis; it is mainly produced in the pentose phosphate pathway. Oxygen is not a product of glycolysis but is used as an electron acceptor in the electron transport chain of cellular respiration.

4. What is the purpose of the first paragraph in relation to the second paragraph?

• A. The first paragraph serves as a cause and the second paragraph serves as an effect.
• B. The first paragraph serves as a contrast to the second.
• C. The first paragraph is a description for the argument in the second paragraph.
• D. The first and second paragraphs are merely presented in a sequence.

Correct answer: A

Rationale: The first paragraph introduces the general characteristics of insects and their ability to live both on land and in the air, setting the stage for discussing specific examples in the second paragraph. The second paragraph then delves into examples of insects that transition from living underwater to the aerial phase, establishing a cause-and-effect relationship between the general concept introduced in the first paragraph and the specific examples in the second paragraph. Choice A is correct because the first paragraph gives the cause (insects being creatures of land and air) and the second paragraph provides the effect (specific examples of insects transitioning between water and air). Choices B, C, and D are incorrect because they do not accurately describe the relationship between the two paragraphs as cause and effect.

5. Differentiate between genotype and phenotype in the context of gene expression.

• A. Genotype refers to the physical manifestation of a trait, while phenotype represents its underlying genetic makeup.
• B. Genotype encompasses the spectrum of possible traits encoded by an organism's genes, while phenotype signifies the specific trait observed.
• C. Genotype denotes the presence of dominant alleles, while phenotype reflects the influence of recessive alleles.
• D. There is no distinction; both terms are interchangeable.

Correct answer: B

Rationale: - Genotype refers to the genetic makeup of an organism, including all the genes and alleles it possesses. - Phenotype, on the other hand, refers to the observable physical characteristics or traits of an organism, which result from the interaction between its genotype and the environment. - While genotype represents the genetic potential or range of traits that an organism can express, phenotype reflects the actual expression of specific traits. - Therefore, option B correctly captures the distinction between genotype and phenotype in the context of gene expression.

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