Practice TEAS Science Test

Correct Answer: B

Rationale: Bile plays a crucial role in digestion by emulsifying fats. It breaks down large fat molecules into smaller droplets, increasing the surface area for enzymes to digest fats. This process aids in the absorption of fat-soluble vitamins and fatty acids. Choices A, C, and D are incorrect as bile does not directly break down carbohydrates, neutralize stomach acid, or absorb proteins in digestion.

Correct Answer: B

Rationale: The correct answer is B: Measuring wheel and mathematical formula. To measure the volume of a cube, you need to measure the length of one side using a measuring wheel and then use the formula V = s^3, where V is the volume and s is the length of one side. This method is suitable because it directly measures the side length of the cube, which is essential for calculating the volume accurately. Choice A, the triple beam balance, is used for measuring mass, not volume. Choice C, the graduated cylinder, is used to measure the volume of irregularly shaped objects using water displacement method, not ideal for a cube. Choice D, the measuring wheel alone, does not provide the formula for calculating the volume of a cube, making it less suitable compared to choice B.

Correct Answer: B

Rationale: The correct answer is B: Medulla oblongata. This part of the brain is located in the brainstem and is responsible for controlling vital involuntary functions like breathing, heart rate, and blood pressure. It contains nuclei that regulate these activities and plays a crucial role in maintaining homeostasis. The cerebellum (A) is involved in coordinating movement and balance, the cerebrum (C) is responsible for higher brain functions like thinking and decision-making, and the thalamus (D) acts as a relay center for sensory information. However, they are not directly involved in controlling involuntary actions like breathing and heart rate.

Correct Answer: D

Rationale: The correct answer is D: Glucose. Glucose is a monosaccharide, not a biological macromolecule. Biological macromolecules are large molecules made up of smaller subunits. Glycoproteins are proteins with attached carbohydrates, DNA is a nucleic acid, and phospholipids are lipids. Glucose, being a simple sugar, is not considered a macromolecule.

Correct Answer: A

Rationale: The correct answer is A: Amygdala. The amygdala is responsible for processing emotions, emotional behavior, and motivation. It plays a crucial role in fear and pleasure responses. It also helps in memory consolidation of emotional events. The other choices, B: Cerebellum, C: Hypothalamus, and D: Pons, do not primarily govern emotions and motivation. The cerebellum is mainly involved in motor control, the hypothalamus regulates basic functions like hunger and thirst, and the pons controls sleep and arousal. Therefore, the amygdala is the correct answer for its specific role in emotions and motivation.