Biology HESI A2 Practice Exam

Correct Answer: B

Rationale: The correct answer is B: Red blood cells lack nuclei. This is because during their maturation process, red blood cells expel their nuclei to make room for hemoglobin, allowing them to carry oxygen efficiently. Nerve cells (A), liver cells (C), and connective tissue cells (D) all have nuclei because they require genetic material for various functions such as protein synthesis, regulation, and repair. Red blood cells, lacking nuclei, are specialized for their main function of transporting oxygen throughout the body.

Correct Answer: B

Rationale: The correct answer is B: Red blood cells lack nuclei. This is because during their maturation process, red blood cells expel their nuclei to make room for hemoglobin, allowing them to carry oxygen efficiently. Nerve cells (A), liver cells (C), and connective tissue cells (D) all have nuclei because they require genetic material for various functions such as protein synthesis, regulation, and repair. Red blood cells, lacking nuclei, are specialized for their main function of transporting oxygen throughout the body.

Correct Answer: C

Rationale: The correct answer is C: Capillaries. Capillaries are found in both open and closed circulatory systems as they are the smallest blood vessels where nutrient and gas exchange occurs. In open systems, capillaries allow direct exchange with tissues, while in closed systems, they connect arteries and veins. Arteries (A) are found in closed systems, not open systems. Red blood cells (B) are present in both systems, but this question specifically asks for a structure, not a component. Immune cells (D) are not typically part of the circulatory system.

Correct Answer: B

Rationale: The correct answer is B because poor internal consistency indicates that the items in the test do not correlate or measure similar things. This means that the items are not measuring the same construct or concept consistently, leading to unreliable results. Choice A is incorrect as it refers to test-retest reliability, not internal consistency. Choice C is incorrect as the researcher should not influence internal consistency. Choice D is incorrect because items should vary to measure different aspects of the construct.

Correct Answer: D

Rationale: During telophase, the correct answer is D: Two nuclei are formed. This is the final stage of cell division where the nuclear membranes reform around the separated chromosomes, leading to the formation of two distinct nuclei. This process ensures that each daughter cell receives a complete set of chromosomes. Option A is incorrect because the nuclear envelope actually reforms during telophase. Option B is incorrect as organelles do not double in number during telophase. Option C is incorrect because chromosomes actually separate during anaphase, not telophase.