Biology HESI A2 Practice Exam

Biology HESI A2 Practice Exam Related

Review Biology HESI A2 Practice Exam related questions and content

How should a researcher test the hypothesis that a particular species of bird vocalizes most in the hours around dawn?

  • A. Observe a flock of the birds in captivity and record them at two-hour intervals from predawn until sunset for a month.
  • B. Observe a flock of the birds in the wild and record them at one-hour intervals from predawn until sunset in several seasons.
  • C. Observe a flock of the birds in the wild and record them in predawn and postdawn hours every day for six months.
  • D. Observe a flock of the birds in the wild, record them at one-hour intervals for a month, and compare that recording to recordings of other species.
Correct Answer: C

Rationale: Observing a flock of the birds in the wild and recording them in predawn and postdawn hours every day for six months would be the best way to test the hypothesis that a particular species of bird vocalizes most in the hours around dawn. This method allows for consistent monitoring of the birds during specific times of interest over an extended period, providing a comprehensive dataset to accurately analyze the vocalization patterns. Options A and B do not focus specifically on dawn hours, making them less suitable for testing the hypothesis. Option D introduces a comparison with other species, which is unnecessary and distracts from the main objective of studying the vocalization pattern of the particular bird species around dawn.

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Most enzymes are made up of what?

  • A. proteins
  • B. lipids
  • C. starches
  • D. simple sugars
Correct Answer: A

Rationale: Most enzymes are made up of proteins. Proteins are large biomolecules composed of amino acids that are vital for the structure and function of enzymes. Enzymes act as catalysts in biochemical reactions, speeding up the rate of chemical reactions in living organisms. They exhibit high specificity and efficiency due to their unique protein structures. Lipids, starches, and simple sugars are not typically the primary components of enzymes, making them incorrect choices.

Which of the following is a tertiary consumer?

  • A. Owl
  • B. Shrew
  • C. Grasshopper
  • D. Wheat
Correct Answer: A

Rationale: The correct answer is A, Owl. Tertiary consumers are organisms that feed on secondary consumers, which, in turn, feed on primary consumers. Owls are considered tertiary consumers because they primarily feed on animals such as rodents, which are secondary consumers. Shrew (choice B) is a secondary consumer, feeding on insects and worms, placing it at a lower trophic level than the owl. Grasshopper (choice C) is a primary consumer, feeding on plants. Wheat (choice D) is not a consumer in the food chain but a plant.

Which is not part of a nucleic acid?

  • A. Sulfate
  • B. Phosphate
  • C. Carbon
  • D. Nitrogen
Correct Answer: A

Rationale: Sulfate is not part of a nucleic acid. Nucleic acids, such as DNA and RNA, are composed of nucleotide units, which consist of a phosphate group, a sugar molecule (ribose in RNA and deoxyribose in DNA), and a nitrogenous base. Carbon and nitrogen are essential elements found in nucleic acids, while sulfate is not a component of nucleic acid structure. Therefore, the correct answer is A: Sulfate.

In nature, water vapor becomes liquid water through the process of ___________.

  • A. condensation
  • B. sublimation
  • C. precipitation
  • D. absorption
Correct Answer: A

Rationale: In nature, water vapor becomes liquid water through the process of condensation. Condensation occurs when water vapor cools and changes its state from a gas to a liquid, forming droplets that we commonly see as water droplets on surfaces or clouds in the sky. Sublimation refers to the transition from a solid to a gas without passing through the liquid phase. Precipitation is the process where water in the atmosphere falls to the ground as rain, snow, sleet, or hail. Absorption is the process of one substance being taken in by another.

Which of these is not an example of a lipid?

  • A. Butter
  • B. Wax
  • C. Canola oil
  • D. Honey
Correct Answer: D

Rationale: Honey is not an example of a lipid because lipids are fat-related molecules that are insoluble in water, while honey is a natural sweet substance made by bees and primarily consists of sugars such as glucose and fructose. Butter, wax, and canola oil are examples of lipids as they are all composed of fat-related molecules that do not dissolve in water.

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