Practice TEAS Science Test

Correct Answer: C

Rationale: The correct answer is C: Humerus. The humerus is the long bone found in the upper arm. It connects the shoulder to the elbow joint. The femur (A) is the long bone found in the thigh, the tibia (B) is the larger of the two lower leg bones, and the radius (D) is one of the two lower arm bones. The humerus is the only bone among the choices that is specifically located in the upper arm, making it the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Protein. Proteins are macromolecules composed of amino acids, which always contain nitrogen in their structure. Amino acids have an amine group (-NH2), which is where the nitrogen is found. Fatty acids (choice A) do not contain nitrogen in their structure. Lipids (choice C) and carbohydrates (choice D) also do not contain nitrogen in their basic structure. Therefore, protein is the only macromolecule among the choices that will always contain nitrogen.

Correct Answer: D

Rationale: The correct answer is D because a positive correlation indicates that as one variable increases, the other variable also increases. In this case, when plotting rainfall against plant length, if the line trends to the upper right, it shows that as rainfall increases, the plant length also increases. This demonstrates a positive correlation. A is incorrect because it describes a negative correlation where an increase in rainfall leads to a decrease in plant stem length. B is incorrect as it suggests a positive correlation between rainfall and roots length. C is incorrect as a line trending to the lower right also indicates a negative correlation between the variables.

Correct Answer: B

Rationale: The correct answer is B: Thyroxine. Thyroxine is produced by the thyroid gland and plays a crucial role in regulating the body's metabolism by controlling the rate at which cells use energy. Insulin is a hormone that regulates blood sugar levels, not metabolism. Melatonin is responsible for regulating sleep-wake cycles, not metabolism. Adrenaline, also known as epinephrine, is involved in the fight or flight response and does not directly regulate metabolism.

Correct Answer: D

Rationale: The correct answer is D: Type O. Type O blood lacks both A and B antigens, making it compatible with all blood types. As a result, it can be safely transfused to individuals with any blood type, earning it the title of the universal donor. Choice A (Type A) has A antigens, Choice B (Type B) has B antigens, and Choice C (Type AB) has both A and B antigens, making them not suitable for universal donation.