Science TEAS Practice Test

Correct Answer: B

Rationale: The correct answer is B: Secondary structure. Secondary structure refers to the local folding patterns of the polypeptide backbone, mainly involving alpha helices and beta sheets. This level of protein structure is determined by hydrogen bonding between amino acids along the backbone. Primary structure (A) is the linear sequence of amino acids, tertiary structure (C) refers to the overall 3D shape of a protein, and quaternary structure (D) involves the arrangement of multiple protein subunits. In this case, the question specifically asks about the folds and coils of the polypeptide backbone, which align with the characteristics of secondary structure.

Correct Answer: A

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: D

Rationale: The correct answer is D: Veins. Veins have the lowest blood pressure among the structures listed. This is because veins have thinner walls and larger lumens compared to arteries and arterioles, which results in less resistance to blood flow and lower pressure. Venules are small vessels that connect capillaries to veins and have slightly higher pressure than veins. Arteries and arterioles have thicker walls and smaller lumens to withstand the higher pressure of blood ejected by the heart. Therefore, veins have the lowest blood pressure due to their structural characteristics.

Correct Answer: A

Rationale: The correct answer is A: Tachycardia. Tachycardia is a condition where the heart rate is abnormally fast, typically above 100 bpm. In this case, with a heart rate of 118 bpm, it falls under tachycardia. Explanation: 1. Tachycardia refers to an elevated heart rate, which is present in this scenario. 2. Apnea is the absence of breathing, not related to heart rate. 3. Bradycardia is a condition where the heart rate is too slow, typically below 60 bpm. 4. Tachypnea is rapid breathing, not related to heart rate. In summary, tachycardia is the correct term for a heart rate of 118 bpm, making the other options incorrect due to their associations with different physiological functions.

Correct Answer: C

Rationale: The correct answer is C: Epidermis. The epidermis is the outermost layer of the skin and is avascular, meaning it does not contain blood vessels. This is important for maintaining its protective function and preventing blood loss in case of injury. The hypodermis (A) contains blood vessels that supply the skin with nutrients and regulate temperature. The dermis (B) is rich in blood vessels, providing nourishment to the skin and regulating temperature. Option D (Hyperdermis) is not a recognized layer of the skin, making it an incorrect choice.