Correct Answer: D

Rationale: The correct answer is Dopamine. Dopamine was initially thought to be the primary cause of schizophrenia. This neurotransmitter hypothesis was based on the observation that drugs that increase dopamine activity can worsen symptoms of schizophrenia, while drugs that decrease dopamine activity can improve symptoms. Choices A, B, and C are incorrect because GABA, serotonin, and epinephrine were not the neurotransmitters initially believed to be the cause of schizophrenia.

Correct Answer: C

Rationale: The correct answer is C: 'Ambivalent.' Children with an ambivalent temperament are indeed generally mild but hesitant about accepting new experiences. This temperament is characterized by a combination of mildness and hesitance. Choice A, 'Secure,' refers to children who are comfortable with both their caregiver's presence and absence, showing a secure attachment style. Choice B, 'Avoidant,' describes children who tend to avoid or ignore their caregiver, displaying an insecure attachment style. Choice D, 'Disorganized,' represents children with inconsistent or confused behaviors towards their caregiver, exhibiting an insecure and disoriented attachment style.

Correct Answer: A

Rationale: Colleen's behavior of seeking attention and manipulating others by threatening self-harm to elicit a response from her psychology instructor aligns with the characteristics of borderline personality disorder. This disorder is characterized by unstable relationships, impulsive actions, and efforts to avoid real or imagined abandonment. Choices B, C, and D are incorrect because they do not match Colleen's behavior as described in the scenario. Schizoid personality disorder is characterized by a lack of interest in social relationships, Schizotypal personality disorder involves social anxiety and odd behavior, and Antisocial personality disorder is characterized by a disregard for others' feelings and violating their rights.

Correct Answer: B

Rationale: The correct answer is B: Sympathetic. When encountering a stressful situation like a ferocious dog, the sympathetic nervous system is activated, leading to the 'fight or flight' response. This response triggers physiological changes like increased heart rate, sweating, and heightened alertness to prepare the body to deal with the perceived threat. The autonomic nervous system (Choice A) encompasses both the sympathetic and parasympathetic divisions, so it's a broader category. The parasympathetic nervous system (Choice C) is responsible for the body's 'rest and digest' functions, which are opposite to the physiological changes seen in a stress response. The somatic nervous system (Choice D) controls voluntary movements and sensory information, not the physiological responses seen in a stress reaction.

Correct Answer: C

Rationale: Gabriel's reaction of turning down the offer of job interview books from his friend despite being depressed and unsuccessful in job hunting best fits the concept of learned helplessness. Learned helplessness occurs when individuals believe they have no control over their situation, leading to passivity and feelings of helplessness. In this case, Gabriel's refusal of the books indicates a sense of resignation and belief that his efforts in finding a job will not be successful, reflecting learned helplessness. Observational learning, insight learning, and modeling do not directly align with Gabriel's reaction in this context.