HESI A2 Biology Practice Test

Correct Answer: B

Rationale: The correct answer is B because of osmosis. Saltwater has a higher concentration of solute than the egg, causing water to move out of the egg, leading to shrinkage. A is incorrect as the egg will lose water, not expand. C is incorrect as there will be a change due to osmosis. D is incorrect as an effect will occur.

Correct Answer: D

Rationale: The correct answer is D because it follows the structure of a hypothesis: it states a relationship between two variables (exposure to red light and plant growth) that can be tested. It is specific, testable, and predicts an outcome. Choice A is a general statement, not a testable hypothesis. Choice B is subjective and not testable. Choice C lacks specificity and does not clearly define the relationship being tested.

Correct Answer: D

Rationale: The correct answer is D because all the statements mentioned in choices A, B, and C are true. A: The respiratory system consists of all organs involved in breathing, including the nose, pharynx, larynx, trachea, bronchi, and lungs. B: Organs included in the respiratory system are the nose, pharynx, larynx, trachea, bronchi, and lungs. C: The respiratory system conveys oxygen into our bodies and removes carbon dioxide from our bodies. Therefore, as all three statements are true, the correct answer is D - All of the Above. The other choices are incorrect because they do not encompass all the organs involved in the respiratory system or the functions it performs.

Correct Answer: C

Rationale: The correct answer is C: The renal system. The renal system consists of the kidneys, ureters, bladder, and urethra, all of which are involved in the formation and release of urine. The kidneys filter waste products from the blood, and the ureters transport urine from the kidneys to the bladder. The bladder stores urine before it is eliminated through the urethra. Choice A, the digestive system, is incorrect because it primarily involves the organs responsible for digestion and absorption of nutrients, such as the stomach, intestines, and liver. Choice B, the reproductive system, is incorrect because it includes organs like the ovaries, testes, and uterus, involved in reproduction, not urine formation. Choice D, the kidney system, is incorrect as it is not a commonly used term to describe the collective organs involved in urine formation and excretion.

Correct Answer: D

Rationale: The plasma membrane is a phospholipid bilayer, meaning it consists of two layers of phospholipid molecules. This arrangement forms a barrier that separates the cell from its external environment. The hydrophobic tails of the phospholipids face inward, while the hydrophilic heads face outward. This structure allows the membrane to control the movement of substances in and out of the cell. Choices A and B are incorrect as the membrane is not solely made of proteins. Choice C is incorrect as the membrane consists of a double layer of phospholipids, not a single layer.