Correct Answer: D

Rationale: Down syndrome is caused by possessing an extra chromosome in chromosome 21, not a chemical imbalance (choice A), a gene on the X chromosome (choice B), or possessing an extra X chromosome (choice C). The presence of an extra copy of chromosome 21, also known as trisomy 21, leads to the characteristic features and health problems associated with Down syndrome.

Correct Answer: D

Rationale: Genes determine the range of characteristics a person has. Choice A is incorrect because genes do not solely determine behavior, as behavior is influenced by a combination of genetic and environmental factors. Choice B is incorrect because while genes can contribute to the risk of developing mental disorders, they do not directly cause them. Choice C is incorrect as genes contribute to but do not solely determine all characteristics a person will have.

Correct Answer: C

Rationale: The correct answer is C. Cortisol is a hormone produced by the adrenal gland that mobilizes the body to deal with stress. It helps regulate metabolism, reduce inflammation, and assist in memory formulation. Choice A is incorrect as cortisol is not released by the hypothalamus and does not travel to the pituitary gland. Choice B is incorrect as cortisol is not released by the pituitary gland but acts on it to regulate hormone production. Choice D is incorrect as cortisol does not reduce the reuptake of monoamine neurotransmitters.

Correct Answer: D

Rationale: The correct answer is D because defense mechanisms aim to reduce anxiety but can lead to distortion of reality, making them not always beneficial. Choice A is incorrect as defense mechanisms are meant to reduce anxiety, not increase it. Choice B is incorrect because defense mechanisms are not strategies of the id specifically. Choice C is incorrect as defense mechanisms are often unconscious and not always intentional.

Correct Answer: D

Rationale: The correct answer is D, Neglectful/uninvolved. This parenting style is associated with a lack of social skills, poor school performance, and moodiness due to the lack of parental involvement and emotional support. Authoritarian parenting (choice A) is characterized by strict rules and high demands, not necessarily linked to these issues. Permissive/indulgent parenting (choice B) involves few rules and high responsiveness, which may not directly lead to these problems. Authoritative parenting (choice C) combines high demands with emotional support and is actually linked to positive outcomes such as good school performance and social skills.