Biology HESI A2 Practice Exam

Correct Answer: D

Rationale: The correct answer is D: Honey. Lipids are organic compounds that are insoluble in water but soluble in organic solvents. Honey does not contain lipids as it mainly consists of sugars and water. Butter (A), wax (B), and canola oil (C) are all examples of lipids as they contain fatty acids and glycerol. Butter is a dairy product high in saturated fats, wax is a type of lipid used for protection in plants and animals, and canola oil is a liquid lipid derived from rapeseed plants.

Correct Answer: B

Rationale: The correct answer is B: Hominidae. Homo sapiens belong to the family Hominidae, which includes great apes like chimpanzees, gorillas, and orangutans. This classification is based on shared physical and genetic characteristics. Choice A (Animalia) is incorrect as it refers to the kingdom level of classification. Choice C (Mammalia) is incorrect as it refers to the class level of classification. Choice D (Chordata) is incorrect as it refers to the phylum level of classification. The key is to identify the correct taxonomic level for the family that includes humans.

Correct Answer: C

Rationale: The correct answer is C (12 chromosomes). During mitosis, a cell replicates its chromosomes and divides into two daughter cells, each containing the same number of chromosomes as the parent cell. Since the parent cell has 12 chromosomes, each daughter cell will also have 12 chromosomes after division. Choice A (3 chromosomes) and B (6 chromosomes) are incorrect because they do not account for the full set of chromosomes in the parent cell. Choice D (24 chromosomes) is incorrect as it would only be the total number of chromosomes if each daughter cell received the full set, which is not the case in mitosis.

Correct Answer: C

Rationale: The correct answer is C: Glucose. In photosynthesis, glucose is not a reactant but a product synthesized as a result of the process. Water (A), light energy (B), and carbon dioxide (D) are all reactants in photosynthesis. Water is split into oxygen and hydrogen ions, light energy is absorbed by chlorophyll to initiate the process, and carbon dioxide is converted into glucose through a series of biochemical reactions. Therefore, glucose is the only option that is not a reactant in photosynthesis.

Correct Answer: C

Rationale: The correct answer is C: Capillaries. Capillaries are found in both open and closed circulatory systems as they are the smallest blood vessels where nutrient and gas exchange occurs. In open systems, capillaries allow direct exchange with tissues, while in closed systems, they connect arteries and veins. Arteries (A) are found in closed systems, not open systems. Red blood cells (B) are present in both systems, but this question specifically asks for a structure, not a component. Immune cells (D) are not typically part of the circulatory system.