HESI A2 Biology Practice Test

Correct Answer: B

Rationale: Correct Answer: B - Glycolysis occurs in the presence of Oxygen. Rationale: 1. Glycolysis is the initial step in cellular respiration and takes place in the cytoplasm of cells. 2. It does not require oxygen to start but can occur in both aerobic and anaerobic conditions. 3. In the presence of oxygen, the pyruvate produced from glycolysis can enter the citric acid cycle for further ATP production. Summary: A: Incorrect - Glycolysis can occur in the presence of oxygen. C: Incorrect - Fermentation is a separate process from glycolysis. D: Incorrect - Anaerobic respiration involves further steps after glycolysis.

Correct Answer: C

Rationale: Anaerobic respiration occurs in bacteria because they live in environments with low oxygen levels. Bacteria adapt to anaerobic conditions by utilizing alternative pathways to generate energy without oxygen. This process allows them to survive and thrive in oxygen-deprived environments. The other choices are incorrect because animals require oxygen for aerobic respiration, plants use sunlight for photosynthesis, and option D is incorrect as bacteria indeed undergo anaerobic respiration in low oxygen environments.

Correct Answer: D

Rationale: The correct answer is D because all the choices - the pituitary gland, the thyroid gland, and the adrenal glands - are indeed components of the endocrine system. Each of these glands secretes hormones directly into the bloodstream to regulate various bodily functions. The pituitary gland controls other endocrine glands, the thyroid gland regulates metabolism, and the adrenal glands manage stress responses. Therefore, all of these glands play vital roles in the endocrine system. The other choices (A, B, C) are incorrect because they are all components of the endocrine system.

Correct Answer: B

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: A

Rationale: To convert cm to mm, you multiply by 10 since 1 cm = 10 mm. Therefore, to convert 8 cm to mm, you multiply 8 by 10 which equals 80 mm. Choice A (80 mm) is correct. Option B (800 mm) is incorrect as it is 10 times the correct answer, making it too large. Option C (8 mm) is incorrect as it represents the original measurement in cm, not the conversion to mm. Option D (0.8 mm) is incorrect as it is one-tenth of the correct answer, making it too small.