HESI A2 Biology Practice Questions and Answers 100% Solved With Explanations Latest Update 2024

1. Which of the following is NOT a part of the body's chemical defense system against infection? A. Urine B. Hydrochloric acid C. Agranulocyte – ANSWER - C D. Lysozyme Agranulocytes are a type of white blood cell and therefore are not a part of the body's chemical defense system. 2. Which of the following is considered an example of naturally acquired passive immunity? A. Attenuated (live) vaccine injection B. Breastfeeding – ANSWER B C. Inactivated (killed) vaccine injection D. Exposure to a disease and subsequent immunity 3. Natural passive immunity occurs when live antibodies are transferred from one individual to another, such as when anti-bodies are transferred from a mother to her baby via breast milk. Worms lack which of the following? A. Eyes and brain B. Brain – ANSWER B C. Eyes D. Nerve centers 4. Worms lack both eyes and a brain, but they do have nerve centers. 5. Which organelle is responsible for generating ATP that is used for chemical energy? A. Mitochondria – ANSWER A B. Vesicle C. Ribosome D. Golgi apparatus