Nursing Elites

1. What is the result when a single zygote separates into two parts, each developing into a separate individual?

• A. Dizygotic twin
• B. Monozygotic twin
• C. Fraternal twin
• D. Nonidentical twin

Correct answer: B

Rationale: The correct answer is B, Monozygotic twin. A monozygotic twin, also known as an identical twin, is the result when a single zygote splits into two parts, leading to the development of two genetically identical individuals. Choices A, C, and D are incorrect because they do not accurately describe the scenario where a single zygote splits into two parts to form identical twins. Dizygotic twin (Choice A) refers to fraternal twins, which result from two separate eggs fertilized by two different sperm cells. Fraternal twin (Choice C) is another term for dizygotic twins, arising from two separate zygotes. Nonidentical twin (Choice D) is a synonymous term for dizygotic or fraternal twins, indicating that they are not genetically identical.

2. Which of the following statements is true?

• A. Most behavioral disorders are determined exclusively by genes.
• B. Genes play a role in most mental disorders.
• C. Genes do not affect biochemical processes.
• D. The genes that will be expressed in an individual are not affected by experience.

Correct answer: B

Rationale: The correct answer is B: 'Genes play a role in most mental disorders.' This statement is true as genes do play a significant role in the development of various mental disorders. Choice A is incorrect because most behavioral disorders are influenced by a combination of genetic, environmental, and other factors, not exclusively genes. Choice C is incorrect as genes do affect biochemical processes. Choice D is incorrect because the expression of genes in an individual can be influenced by experiences and environmental factors, a concept known as gene-environment interaction.

3. Which psychosexual stage focuses on castration anxiety?

• A. Genital
• B. Oral
• C. Anal
• D. Phallic

Correct answer: D

Rationale: Castration anxiety is a concept from Freudian psychoanalytic theory that occurs during the Phallic stage. This stage occurs between 3 to 6 years of age and is when children experience conflicts related to the Oedipus complex (boys) and Electra complex (girls). During this stage, children may fear castration (in boys) or penis envy (in girls), which are crucial components of castration anxiety. Therefore, the correct answer is Phallic. The other options (A: Genital, B: Oral, C: Anal) are incorrect as they do not specifically involve castration anxiety but rather represent different stages in Freud's psychosexual development theory.

4. Biological discoveries ________.

• A. have lessened the subjectivity of definitions of abnormality.
• B. demonstrate that the environment plays only a minimal role in the development of psychopathology.
• C. make it clear that mental disorders are diseases and should be dealt with by the medical profession.
• D. have led to a recognition of the role that genetic factors and other biological influences play in the development of many disorders.

Correct answer: D

Rationale: Biological discoveries have indeed led to a recognition of the role that genetic factors and other biological influences play in the development of many disorders. This understanding has shifted the focus from purely environmental explanations to acknowledging the significant impact of genetics and biology on mental health. Choices A, B, and C are incorrect because biological discoveries have not specifically addressed the subjectivity of definitions of abnormality, minimized the role of the environment in psychopathology, or definitively classified mental disorders as diseases that should only be handled by the medical profession.

5. What neurotransmitter was first believed to be the cause of schizophrenia?

• A. GABA
• B. Serotonin
• C. Epinephrine
• D. Dopamine

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.

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