Which action by the occupational health nurse is a secondary prevention activity?

Correct Answer: A

Rationale: The correct answer is A: Screening for hearing loss. Secondary prevention aims to detect and treat health issues in their early stages to prevent progression. Screening for hearing loss helps identify potential problems early, allowing for timely intervention. Safety inspections (B) are primary prevention by identifying hazards before harm occurs. Educating employees about eye protection (C) is also primary prevention. Completing a physical assessment after an injury (D) is tertiary prevention, focusing on rehabilitation and preventing complications.

Correct Answer: D

Rationale: The correct answer is D because genetics is complex and multifaceted. 1. A: Presence of a gene not defining phenotype shows gene-environment interactions. 2. B: Hidden genes in carriers illustrate the concept of genetic variability. 3. C: Both parents' contributions are crucial due to inheritance patterns. Combining these reasons, genetics is challenging due to its intricate nature encompassing gene-environment interactions, genetic variability, and inheritance patterns.

Correct Answer: A

Rationale: The correct answer is A because both DNA and proteins are polymers composed of repeating units. In DNA, the subunits are nucleotides, while in proteins, the subunits are amino acids. This structural similarity allows for the interchangeability of subunits during synthesis and provides diversity in molecular structures and functions. Choice B is incorrect because while hydrogen bonds are important in stabilizing the structures of both DNA and proteins, they are not the primary determinant of their overall structure. Choice C is incorrect because while the shape of proteins (tertiary structure) directly influences their function, DNA function is primarily related to its sequence rather than its shape.

Correct Answer: B

Rationale: The correct answer is B: Both parents contribute a "haploid" gamete. In Mendelian genetics, offspring inherit one set of chromosomes from each parent, resulting in a combination of genetic material from both parents. This process involves the fusion of haploid gametes during fertilization, leading to genetic variation in the offspring. This fundamental principle of genetic inheritance is crucial in understanding Mendel's laws of segregation and independent assortment. A: Genes code for proteins - This statement is true but not the basis of Mendelian genetics. The relationship between genes and proteins is important but not specific to Mendelian genetics. C: One parent's genome is dominant - This statement is incorrect. Dominance is a concept related to gene expression, not the basis of Mendelian genetics. D: Genes can skip generations - This statement refers to non-Mendelian inheritance patterns, such as incomplete dominance or epistasis, which do not align with the basic principles of Mendelian genetics.

Correct Answer: D

Rationale: The correct answer is D because the Hardy-Weinberg equation requires all the conditions mentioned in choices A, B, and C to be met for a population to be in genetic equilibrium. Choice A ensures genetic diversity, choice B ensures no natural selection, and choice C ensures no gene flow from other populations, which are all essential for the equation to be valid. Therefore, the correct answer is D as it encompasses all necessary conditions.