Biology HESI A2 2024

Correct Answer: B

Rationale: The correct answer is B: Precise. The measurements are precise because they are consistent with each other, showing low variability. However, they are not accurate as they do not reflect the true value of 30 g. Option A is incorrect because accuracy refers to how close measurements are to the true value. Option C is incorrect as the measurements are not accurate. Option D is incorrect because the measurements are precise but not accurate.

Correct Answer: C

Rationale: The correct answer is C: 1 female : 2 males. In this scenario, the male offspring have a 50% chance of inheriting the hemophilia gene from the carrier mother, resulting in a 1:1 ratio of affected males to unaffected males. The female offspring will inherit one normal X chromosome from the father and one affected X chromosome from the mother, making them carriers but not affected. Therefore, the predicted ratio of offspring with the disease is 1 female carrier to 2 affected males. Choices A, B, and D are incorrect because they do not reflect the actual inheritance pattern of hemophilia in this scenario.

Correct Answer: A

Rationale: The correct answer is A because chlorophyll appears green due to its absorption spectrum. It absorbs light most efficiently in the blue and red regions of the spectrum, while reflecting or transmitting green light. This selective absorption of light wavelengths results in chlorophyll appearing green to our eyes. Choice B is incorrect because chlorophyll does not primarily absorb green light. Choice C is incorrect as chlorophyll actually does absorb green light, just not as efficiently as blue and red light. Choice D is incorrect because chlorophyll primarily absorbs red and blue light, not red light alone.

Correct Answer: B

Rationale: During interphase, the cell prepares for division by replicating its DNA, including the chromosomes. This occurs before the actual cell division stages of mitosis or meiosis. Prophase is the stage where chromosomes condense, not replicate. Anaphase is when sister chromatids separate, and telophase is the final stage where chromosomes de-condense. Therefore, the correct answer is B (Interphase) as it is the specific phase where chromosome replication occurs.

Correct Answer: D

Rationale: The correct answer is D: Salmonella. Binary fission is a form of asexual reproduction where a single organism divides into two identical organisms. Salmonella is a bacterium that reproduces through binary fission. Mushrooms reproduce via spores, blue whales and rainbow trout reproduce sexually. Therefore, Salmonella is the only organism among the choices that reproduces via binary fission.