HESI A2 Biology 2024

HESI A2 Biology 2024 Related

Review HESI A2 Biology 2024 related questions and content

A student was asked to count birds in a given location over a 24-hour period. Which count would make their data most valid?

  • A. Count birds at one feeder every 6 hours.
  • B. Count birds at three feeders at noon and 6:00 P.M.
  • C. Count birds at one feeder at noon and 6:00 P.M.
  • D. Count birds at three feeders every 6 hours.
Correct Answer: C

Rationale: Counting birds at one feeder at consistent time intervals (noon and 6:00 P.M.) over a 24-hour period ensures that the data collected are evenly distributed and provide a more accurate representation of the bird population in that location throughout the day. This method allows for observations during different times of the day, capturing potential variations in bird activity and distribution. Choice A is not as effective as it lacks observations at different times of the day, potentially missing variations in bird behavior. Choice B involves multiple locations and times, which could introduce more variables and make it harder to analyze the data accurately. Choice D, counting birds at three feeders every 6 hours, may provide too frequent data points and not cover all significant time intervals for observing bird activity.

You may also like to solve these questions

Which molecules contain only carbon, hydrogen, and oxygen?

  • A. Lipids and proteins
  • B. Carbohydrates and lipids
  • C. Proteins and carbohydrates
  • D. Nucleic acids and proteins
Correct Answer: B

Rationale: Carbohydrates and lipids are the molecules that contain only carbon, hydrogen, and oxygen. Carbohydrates such as sugars and starches are made up of carbon, hydrogen, and oxygen in a ratio of 1:2:1, while lipids such as fats and oils are composed of carbon, hydrogen, and oxygen as well. Lipids typically contain more carbon and hydrogen atoms compared to oxygen atoms. Proteins contain nitrogen in addition to carbon, hydrogen, and oxygen, while nucleic acids contain phosphorus in addition to carbon, hydrogen, and oxygen. Therefore, choices A, C, and D are incorrect as they include molecules that contain elements other than carbon, hydrogen, and oxygen.

In an example of a male with hemophilia and a female carrier, what percentage of the offspring is predicted to be carriers only?

  • A. 0%
  • B. 25%
  • C. 50%
  • D. 100%
Correct Answer: C

Rationale: In this scenario, the male offspring will inherit the X chromosome with the hemophilia gene from the mother, as males have one X chromosome inherited from their mother. The female offspring will inherit one normal X chromosome from the father and one X chromosome with the hemophilia gene from the mother, making them carriers of the hemophilia trait. Therefore, 50% of the offspring will be carriers only. Option A (0%) is incorrect as female offspring will inherit the X chromosome with the hemophilia gene from the mother. Option B (25%) is incorrect as the female offspring will not be unaffected. Option D (100%) is incorrect as not all offspring will be carriers, only the female offspring.

What happens during anaphase?

  • A. Chromosomes move to opposite ends of the spindle.
  • B. Nuclear membrane and nucleoli disintegrate.
  • C. Chromatids line up at the center of the spindle.
  • D. Nuclear membrane and nucleoli form.
Correct Answer: A

Rationale: During anaphase, the sister chromatids, joined at the centromere, separate and move towards opposite ends of the spindle apparatus. This movement ensures that each daughter cell receives an identical set of chromosomes. Choice B is incorrect as the disintegration of the nuclear membrane and nucleoli occurs during prophase. Choice C is incorrect as chromatids align at the center of the spindle during metaphase, not anaphase. Choice D is incorrect as the formation of the nuclear membrane and nucleoli occurs during telophase, not anaphase.

Which statement is true of enzymes?

  • A. They are made from lipids.
  • B. They are made from proteins.
  • C. They form double chains of DNA.
  • D. They bind with catalysts.
Correct Answer: B

Rationale: The correct answer is B: Enzymes are made from proteins. Enzymes are biological molecules that act as catalysts to speed up chemical reactions in living organisms. While the majority of enzymes are proteins, a few are made from RNA. The statement that enzymes are made from lipids (choice A) is incorrect. Enzymes do not form double chains of DNA (choice C) as their primary function is not related to DNA structure. Additionally, enzymes themselves do not bind with catalysts (choice D); instead, they act as catalysts to facilitate reactions.

Which is an example of a gymnosperm?

  • A. Red cedar
  • B. Japanese cherry
  • C. Flowering dogwood
  • D. American chestnut
Correct Answer: A

Rationale: Red cedar is the correct answer as it is an example of a gymnosperm. Gymnosperms are plants that produce seeds not enclosed within an ovary or fruit. In the case of red cedar, it belongs to the gymnosperm group and has naked seeds that are exposed on the surface of scales or leaves. Choices B, C, and D are angiosperms, not gymnosperms. Japanese cherry, flowering dogwood, and American chestnut are all examples of angiosperms, which are flowering plants with seeds enclosed within an ovary.

Copyright © 2025 Nokea. All rights reserved.