which statement about the human immunodeficiency virus hiv is true

ATI RN

Human Growth and Development Exam 1

1. Which statement about the human immunodeficiency virus (HIV) is true?

A. About 30 percent of all new HIV infections affect women.
B. In South Africa, 30 percent of all pregnant women are HIV-positive.
C. About 30 percent of new HIV infections occur in developing countries.
D. Untreated HIV-infected mothers pass the virus to the fetus 30 percent of the time.

Correct answer: B

Rationale: The correct answer is B: 'In South Africa, 30 percent of all pregnant women are HIV-positive.' This statement is true as South Africa has a high prevalence of HIV among pregnant women, emphasizing the need for interventions to prevent mother-to-child transmission. Choices A, C, and D are incorrect. Choice A is inaccurate as women account for more than 50% of new HIV infections globally. Choice C is misleading as the majority of new HIV infections actually occur in sub-Saharan Africa, not just developing countries. Choice D is also incorrect as without treatment, the risk of mother-to-child transmission is higher than 30%.

2. Development is best understood as __________.

A. genetically determined
B. environmentally influenced
C. an unsolvable puzzle
D. a series of complex exchanges between nature and nurture

Correct answer: D

Rationale: The correct answer is D. Development is best understood as a series of complex exchanges between nature (genetic factors) and nurture (environmental influences). This perspective emphasizes the interaction and interplay between genetic predispositions and environmental experiences in shaping an individual's development. Choices A and B are too extreme as they suggest that development is solely determined by genetics or solely influenced by the environment, which is not the case. Choice C is incorrect as development is not viewed as an unsolvable puzzle but rather as a dynamic process influenced by multiple factors.

3. Ecological systems theory views the person as __________.

A. a blossoming flower whose development is a genetically determined series of events that unfold automatically
B. developing within a complex system of relationships affected by multiple levels of the surrounding environment
C. a social being influenced primarily by observational learning or adult modeling
D. a computer-like system that actively codes, transforms, and organizes information

Correct answer: B

Rationale: Ecological systems theory views the person as developing within a complex system of relationships affected by multiple levels of the surrounding environment. This perspective emphasizes the interconnectedness of individuals with their social and physical environment, recognizing that development is influenced by various factors interacting at different levels of the ecological system. Choice A is incorrect because it describes a genetically determined development process, which is not the focus of ecological systems theory. Choice C is incorrect because it highlights observational learning as the primary influence on development, neglecting the broader environmental factors. Choice D is incorrect as it compares the person to a computer system, which does not align with the principles of ecological systems theory.

4. Dr. Dias's research shows that the death of a spouse in old age is correlated with a decline in the surviving partner's physical health. Which conclusion is supported by this study?

A. The death of a spouse causes a decline in the surviving partner's physical health.
B. The death of a spouse is related to a decline in the surviving partner's physical health.
C. A decline in a surviving partner's physical health can cause the death of a spouse.
D. A third variable, such as memory loss, causes a surviving partner's decline in physical health following the death of a spouse.

Correct answer: B

Rationale: Dr. Dias's research findings indicate a correlation between the death of a spouse and a decline in the surviving partner's physical health. This correlation suggests a relationship between the two variables, but it does not necessarily imply a direct cause-and-effect relationship. Therefore, the correct conclusion supported by this study is option B - 'The death of a spouse is related to a decline in the surviving partner's physical health.' Option A is too direct in its causation claim, which is not proven by correlation alone. Option C reverses the cause and effect relationship suggested by the research. Option D introduces an unrelated third variable, which is not supported by the study's findings.

5. During prenatal development, the ectoderm becomes the __________.

A. muscles and skeleton
B. nervous system and skin
C. circulatory system and other internal organs
D. digestive system, lungs, urinary tract, and glands

Correct answer: B

Rationale: The correct answer is B: nervous system and skin. The nervous system, which includes the brain, spinal cord, and nerves, as well as the skin, develop from the ectoderm layer of cells during prenatal development. Choice A is incorrect because muscles and skeleton develop from mesoderm. Choice C is incorrect because the circulatory system and other internal organs develop from mesoderm and endoderm. Choice D is incorrect because the digestive system, lungs, urinary tract, and glands develop from endoderm.