Which action should the school nurse perform to address dental health at the community level?

Correct Answer: B

Rationale: The correct answer is B: Advocate for fluoridation of drinking water. Fluoridation of drinking water is a community-level intervention that has been proven effective in reducing dental caries and improving oral health. By advocating for fluoridation, the school nurse can help improve the dental health of the entire community. A: Educating caregivers of children with dental caries about oral health is important, but it is more of an individual-level intervention rather than a community-level action. C: Assisting caregivers with finding dental resources for children without dental insurance is also valuable, but it does not address dental health at a community level. D: Teaching children in school how to floss properly is a good preventive measure, but it is not as impactful at the community level as advocating for fluoridation of drinking water.

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 the National Office of Public Health Genomics emphasizes the importance of public health professionals recognizing the limitations of their own knowledge and seeking appropriate expertise when needed. Judgment consistent with making referrals shows awareness of one's competency level in genomics, which is crucial for effective public health practice. Interpreting a karyotype (A) and running a Genome-wide Association Study (C) are technical skills that may not be necessary for all public health professionals. Choice B is not a valid option as it is incomplete.

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.