the site of chemical communication in the brain is the
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Psychology 101 Final Exam

1. The site of chemical communication in the brain is the ________.

Correct answer: B

Rationale: The synapse is the correct answer. It is the site where communication between neurons occurs through the release and reception of neurotransmitters. Choice A, neuron, is incorrect as it is the cell itself rather than a specific site of communication. Choice C, axon, is also incorrect as it is a part of the neuron that transmits signals away from the cell body. Choice D, dendrite, is not the correct answer either, as dendrites receive signals from other neurons but do not release neurotransmitters for communication.

2. In order for one to have a recessive trait (e.g., having red hair), the person must receive?

Correct answer: B

Rationale: Recessive traits are expressed when an individual inherits two copies of the recessive gene, one from each parent. Therefore, the correct answer is B. Choice A is incorrect as one copy of a recessive gene is not sufficient to display a recessive trait. Choice C is incorrect because having at least one copy of a dominant gene is unrelated to expressing a recessive trait. Choice D is incorrect because two copies of a recessive gene must come from both parents, not just one.

3. Which of the following is not a common method for studying genetic influences?

Correct answer: A

Rationale: The correct answer is A. Studying specific gene defects is not a common method for investigating genetic influences. Choices B, C, and D are common methods used in genetic research. Twin studies help determine the heritability of traits, adoption studies compare similarities between adopted individuals and their adoptive families versus biological families, and family history studies track the inheritance patterns of traits within families.

4. Which of the following statements about brain dysfunction and psychiatric disorders is correct?

Correct answer: C

Rationale: The correct statement is C: 'Changes in brain function appear to play a role in many psychiatric disorders.' This statement is accurate as research suggests that alterations in brain function are associated with various psychiatric disorders. Option A is incorrect because while brain damage can contribute to some psychiatric conditions, it is not always the primary cause. Option B is incorrect as brain damage typically increases the risk of developing psychiatric disorders. Option D is incorrect because while brain development can be influenced by experiences, it does not always decrease the risk of psychiatric conditions.

5. What are the potential effects of childhood trauma on adult behavior?

Correct answer: B

Rationale: Childhood trauma can have profound and lasting effects on behavior and mental health in adulthood. It can lead to various issues such as anxiety, depression, PTSD, and difficulties in forming relationships. Choice A is incorrect because childhood trauma doesn't automatically disappear with age. Choice C is incorrect as research shows that childhood trauma can significantly impact adult behavior. Choice D is incorrect as overcoming childhood trauma is usually a complex and challenging process that may require therapy and support.

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