Biology HESI A2 2024 - Nurselytic

Correct Answer: A

Rationale: The stamen is the male reproductive organ of a plant, producing pollen grains. The pistil, consisting of the stigma, style, and ovary, is the female reproductive organ.
Therefore, the stamen is of a different 'gender' than the other parts of the plant's reproductive system. The pistil, stigma, and style are all part of the female reproductive system, involved in receiving pollen and supporting fertilization. Stamen is the correct answer as it is the male part of a plant's reproductive system, making it different 'gender-wise' from the female parts.

Correct Answer: C

Rationale: The correct answer is C: "Producers > secondary consumers." Producers, like plants, are the foundation of the energy pyramid, containing the highest energy content in an ecosystem. They convert solar energy into chemical energy through photosynthesis. Secondary consumers, being organisms that feed on other organisms, have lower energy content compared to producers. This hierarchy in energy content is due to the transfer of energy through trophic levels.
Choice A is incorrect because decomposers, though essential for nutrient recycling, typically have lower energy content than secondary consumers.
Choice B is incorrect because primary consumers, which feed directly on producers, have lower energy content than producers.
Choice D is incorrect because secondary consumers have lower energy content compared to primary consumers.

Correct Answer: A

Rationale: Chlorophyll appears green to us because it primarily absorbs yellow and blue light while reflecting green light. The wavelengths of yellow and blue light are absorbed by chlorophyll for photosynthesis, which results in the green color we perceive.
Choice B is incorrect because chlorophyll absorbs yellow and blue light, not green light.
Choice C is incorrect because chlorophyll does absorb green light, but it also absorbs other wavelengths, primarily yellow and blue.
Choice D is incorrect because chlorophyll primarily absorbs yellow and blue light, not red light.

Correct Answer: C

Rationale: In this scenario, the male offspring will inherit the hemophilia trait from their mother due to the sex-linked inheritance pattern. The female offspring will inherit one X chromosome from their mother, becoming carriers of hemophilia.
Therefore, the predicted ratio of offspring with the disease would be 1 female as a carrier and 2 males with hemophilia.
Choice A is incorrect because there would be male offspring with the disease.
Choice B is incorrect as there would be male offspring with hemophilia.
Choice D is incorrect as it does not reflect the inheritance pattern of hemophilia.

Correct Answer: B

Rationale: Meiosis is the type of cell division that creates cells with half the number of chromosomes compared to the parent cell. This is essential for sexual reproduction as it ensures that when the sex cells (sperm and egg) combine during fertilization, the resulting offspring has the correct number of chromosomes. In contrast, mitosis results in two identical daughter cells with the same number of chromosomes as the parent cell.
Choice A is incorrect because mitosis is responsible for the division of body cells, not sex cells.
Choice C is incorrect because telophase is a phase that occurs in both mitosis and meiosis.
Choice D is incorrect because spermatogenesis and oogenesis involve meiosis, not mitosis.