Biology HESI A2 Practice Exam

Correct Answer: B

Rationale: The correct answer is B because poor internal consistency indicates that the items in the test do not correlate or measure similar things. This means that the items are not measuring the same construct or concept consistently, leading to unreliable results. Choice A is incorrect as it refers to test-retest reliability, not internal consistency. Choice C is incorrect as the researcher should not influence internal consistency. Choice D is incorrect because items should vary to measure different aspects of the construct.

Correct Answer: D

Rationale: The correct answer is D: Ethyl alcohol fermentation. Beer production involves the conversion of sugars into ethyl alcohol and carbon dioxide by yeast through the process of fermentation. Lactic acid fermentation (A) produces lactic acid, not ethyl alcohol. Acetic acid fermentation (B) produces acetic acid, not ethyl alcohol. Propionic acid fermentation (C) produces propionic acid, not ethyl alcohol. Therefore, option D is the only choice that aligns with the process of beer production.

Correct Answer: A

Rationale: The correct answer is A: Sulfate. Nucleic acids consist of nucleotides, which are composed of a phosphate group, a sugar molecule (carbon), and a nitrogenous base. Sulfate is not a component of nucleic acids. Phosphate is essential for forming the backbone of the nucleic acid molecule. Carbon is present in the sugar component of the nucleotide. Nitrogen is found in the nitrogenous bases that pair in DNA and RNA. Therefore, among the choices, only sulfate is not a part of nucleic acids.

Correct Answer: A

Rationale: Condensation is the process in which water vapor cools down and transforms into liquid water. This occurs when the temperature of the air decreases, causing the water vapor to lose energy and condense into liquid droplets. Sublimation is the direct transition from solid to gas phase, not liquid. Precipitation is the process of water falling from the sky in various forms, such as rain or snow, but it does not specifically refer to the transformation of water vapor to liquid. Absorption involves one substance taking in another substance, which is not the process of water vapor becoming liquid water. Therefore, the correct answer is A: condensation.

Correct Answer: C

Rationale: The correct answer is C: rod-shaped. Bacillus subtilis is a type of bacteria known for its rod-shaped morphology. This shape is characteristic of this specific bacterium and distinguishes it from other bacterial shapes such as spiral (A), globular (B), and grape-like clusters (D). The rod shape of Bacillus subtilis allows it to efficiently reproduce and adapt to various environments. This morphology also plays a role in its motility and survival strategies. By understanding the distinct rod-shaped morphology of Bacillus subtilis, one can accurately identify and differentiate it from other bacterial species.