Biology HESI A2 Practice Test

Correct Answer: C

Rationale: Correct Answer: C Rationale: 1. Sexual reproduction involves two cells (sperm and egg) contributing genetic material to offspring, leading to genetic variation. 2. Greater genetic variation in offspring helps in adapting to changing environments and enhances species survival. 3. Asexual reproduction involves a single parent cell dividing to produce genetically identical offspring. 4. Option A is incorrect as sexual reproduction does not result in half of the cells being identical to the original cell. 5. Option B is incorrect as asexual reproduction does not result in greater variation, it produces genetically identical offspring. 6. Option D is incorrect as sexual reproduction involves two cells contributing genetic material, leading to variation.

Correct Answer: B

Rationale: The correct answer is B: Tendons, ligaments. Tendons connect muscles to bones, enabling movement. Ligaments connect bones to each other, providing stability. Muscles and ligaments are not directly involved in connecting muscles to bones. Therefore, option B is the most appropriate choice.

Correct Answer: D

Rationale: The correct answer is D, the endocrine system. This system releases hormones directly into the bloodstream to regulate various bodily functions and maintain homeostasis. Hormones act as chemical messengers that travel throughout the body to target cells or organs, influencing processes like metabolism, growth, and mood. The gastrointestinal system (choice A) primarily focuses on digestion and nutrient absorption, not hormone release. The digestive system (choice C) is responsible for breaking down food and absorbing nutrients, not hormone regulation. The repetition of the endocrine system as choice D is likely a mistake.

Correct Answer: B

Rationale: The scientist needs 12mL, which is equivalent to 0.012L. Since the bottle holds 12L, it contains more than enough solution. Therefore, choice B is correct. Choice A is incorrect because the scientist needs less than the total amount in the bottle. Choice C is incorrect because the scientist actually has more than enough. Choice D is also incorrect as the scientist does have more than required.

Correct Answer: C

Rationale: The correct answer is C. Antibiotics do not cause more bacteria to grow; in fact, they aim to kill or inhibit the growth of bacteria. Antibiotics interfere with the bacteria's ability to survive by targeting specific processes essential for their growth and reproduction (A). They can affect how bacteria multiply by inhibiting cell wall synthesis, protein synthesis, or DNA replication (B). Lastly, antibiotics specifically target bacteria and do not work on viruses or fungi (D). Therefore, choice C is the only statement that is not true about antibiotics.