ATI TEAS Practice Science Test

Correct Answer: B

Rationale: The correct answer is B: Liver. The liver plays a crucial role in storing and metabolizing vitamins, releasing them as needed when intake decreases. It helps maintain vitamin levels in the body. The other choices are incorrect because the appendix has no role in vitamin absorption or regulation, the pancreas primarily aids in digestion and hormone regulation, and the stomach's main function is to break down food, not regulate vitamin levels.

Correct Answer: D

Rationale: The correct answer is D: Sucrase. Sucrose is a disaccharide composed of glucose and fructose. Sucrase is the enzyme responsible for breaking down sucrose into its constituent sugars, glucose, and fructose. Lactase (A) breaks down lactose, Maltase (B) breaks down maltose, and Peptidase (C) breaks down proteins. In this case, since we are dealing with sucrose from the birthday cake, the enzyme needed is sucrase to catalyze the breakdown of sucrose into its simpler sugars.

Correct Answer: A

Rationale: During Prophase I of meiosis, chiasmata structures form as homologous chromosomes exchange genetic material through crossing over. This occurs after homologous chromosomes pair up during synapsis. Chiasmata play a crucial role in genetic diversity. In contrast, Prophase II is focused on preparing the cells for division, and chiasmata formation does not occur during this phase. Metaphase I is characterized by the alignment of homologous chromosomes at the metaphase plate, while Metaphase II involves the alignment of sister chromatids. Therefore, the correct answer is A: Prophase I, as it is the specific phase where chiasmata formation takes place.

Correct Answer: B

Rationale: To convert grams to kilograms, we divide by 1000 since there are 1000 grams in a kilogram. Therefore, 1800 grams divided by 1000 equals 1.8 kilograms. Choice B is correct. Choice A is incorrect because 0.18 is the result of dividing by 10, not 1000. Choice C is incorrect as it is 10 times the correct answer. Choice D is incorrect as it is 100 times the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Amygdala. The amygdala is a key structure in the brain responsible for processing emotions, including fear and anxiety. When a person experiences anxiety attacks, the amygdala is often overactive. Targeting the amygdala with medication can help regulate its activity and reduce anxiety symptoms. The other choices (B: Parietal lobe, C: Hypothalamus, D: Sensory neuron) are not directly involved in regulating emotions like anxiety. The parietal lobe is mainly responsible for processing sensory information, the hypothalamus regulates functions like hunger and thirst, and sensory neurons transmit sensory information to the brain.