HESI A2 Biology 2024

Correct Answer: A

Rationale: The correct answer is A: Golgi apparatus. Protists are eukaryotic organisms, so they have membrane-bound organelles like the Golgi apparatus. Monerans, which are prokaryotic organisms, lack membrane-bound organelles. The Golgi apparatus is essential for processing and packaging proteins for secretion or for use within the cell. Chromosomes (B) are found in both protists and monerans, as they contain genetic material. Cytoplasm (C) is a basic component of all cells, found in both protists and monerans. Cell membrane (D) is also present in both protists and monerans, as it is essential for maintaining cell structure and regulating the movement of substances in and out of the cell.

Correct Answer: A

Rationale: The correct answer is A: Blue. Blue light is essential for photosynthesis as it is absorbed by chlorophyll, the pigment that drives the process. Blue light helps in vegetative growth and overall plant development. Yellow, green, and orange lights are not as effective as they are not as readily absorbed by plants for photosynthesis. Yellow and green lights do not provide the necessary energy for plant growth, while orange light is less efficient in promoting photosynthesis compared to blue light. Therefore, blue light is the most effective choice for growing green plants indoors.

Correct Answer: D

Rationale: The correct answer is D: Mitosis. In the tip of a plant's root, cells undergo mitosis to increase in number. In mitosis, a parent cell divides into two identical daughter cells, ensuring the growth and repair of tissues. Meiosis, choice A, is a process of cell division that produces gametes with half the genetic material. Cytokinesis, choice B, is the process of cytoplasmic division following cell division. Fractioning, choice C, is not a biological process related to cell division. Mitosis is the only process mentioned that specifically describes cell division for growth and repair in plants.

Correct Answer: A

Rationale: The correct answer is A because it involves testing the impact of radiation from a single cell phone on the temperature of water in a test tube in a controlled manner. By letting the phone ring for two minutes and recording the temperature before and after, the researcher can isolate the effects of radiation. Choice B introduces additional variables by varying the ringing time, making it difficult to determine the specific impact of radiation. Choice C introduces the factor of different cell phone brands, which may have varying radiation levels and could confound the results. Choice D also introduces multiple variables by using different ringing times and phone brands, making it challenging to attribute any temperature changes solely to radiation from the cell phones. Therefore, choice A is the most appropriate as it ensures a controlled experiment to directly test the hypothesis regarding the impact of cell phone radiation on water temperature.

Correct Answer: C

Rationale: The correct answer is C: Order. Classification starts from the broadest category (Kingdom) to the most specific (Genus). Carnivora is an Order in the classification hierarchy, encompassing various families of carnivorous mammals, including dogs. Therefore, the correct classification for dogs within the Carnivora group is Order. Choices A, B, and D are incorrect because Kingdom refers to the highest taxonomic rank, Class is a level below Order, and Genus is a more specific category than Order.