HESI A2 Biology Practice Test

Correct Answer: D

Rationale: The correct answer is D because all the statements mentioned in choices A, B, and C are true. A: The respiratory system consists of all organs involved in breathing, including the nose, pharynx, larynx, trachea, bronchi, and lungs. B: Organs included in the respiratory system are the nose, pharynx, larynx, trachea, bronchi, and lungs. C: The respiratory system conveys oxygen into our bodies and removes carbon dioxide from our bodies. Therefore, as all three statements are true, the correct answer is D - All of the Above. The other choices are incorrect because they do not encompass all the organs involved in the respiratory system or the functions it performs.

Correct Answer: D

Rationale: The correct answer is D: Biomes. Biomes are large geographical areas characterized by specific climate, vegetation, and animal life. Tundra, savannas, grasslands, deserts, and rainforests are all examples of biomes. They are classified based on factors like temperature, precipitation, and flora/fauna. Biomasses (A) refer to the total mass of living organisms in a given area. Biospheres (B) are the regions of the Earth where life exists. Biodiversity (C) refers to the variety and variability of life forms in a specific habitat, not the specific types of habitats themselves.

Correct Answer: B

Rationale: Enzymes are typically proteins because they are biological catalysts made up of amino acids. Proteins have specific structures that allow them to bind to substrates and speed up chemical reactions. Fats, sugars, and neurons do not possess the specific structural properties required for enzyme function. Therefore, the correct answer is B (Proteins).

Correct Answer: A

Rationale: The correct answer is A: Dominant. When a genotype consists of a dominant and a recessive allele, the dominant allele will determine the phenotype. This is because the presence of a dominant allele masks the expression of the recessive allele. In this case, the dominant allele will be expressed phenotypically, resulting in a trait that is like the dominant allele. Choices B, C, and D are incorrect because in this scenario, the dominant allele will be the one that is visibly expressed, not the recessive allele, both alleles, or neither allele.

Correct Answer: A

Rationale: The correct answer is A because water's polarity leads to hydrogen bonding, high specific heat value, and versatile solvent properties. Polarity in water results from its unequal sharing of electrons between hydrogen and oxygen atoms, creating a partial positive and negative charge. This polarity allows water molecules to form hydrogen bonds, which contribute to its high specific heat value, meaning water can absorb and release heat without drastic temperature changes. Additionally, water's polarity enables it to act as a versatile solvent, dissolving many substances. Choices B, C, and D are incorrect because they mention incorrect types of bonding and specific heat values that do not align with water's characteristics.