ATI TEAS 7 Science

Correct Answer: B

Rationale: The correct answer is B: Neuron. A neuron is the basic structural and functional unit of the nervous system because it is responsible for transmitting electrical and chemical signals within the nervous system. Neurons have three main parts: dendrites, cell body, and axon. Dendrites receive signals from other neurons, the cell body processes these signals, and the axon transmits signals to other neurons or to muscles and glands. The other choices, A: Axon, C: Dendrite, and D: Synapse, are all components of a neuron but do not individually represent the complete functional unit of the nervous system.

Correct Answer: A

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: D

Rationale: The Golgi apparatus is responsible for modifying, sorting, and packaging proteins and lipids for transport within or outside the cell. It receives proteins from the endoplasmic reticulum for further processing. Option D is correct because it accurately describes the main functions of the Golgi apparatus. Option A is incorrect because the transport of proteins and lipids is primarily carried out by the endoplasmic reticulum. Option B is incorrect as the Golgi apparatus is not primarily for storing water and nutrients. Option C is incorrect because protein synthesis primarily occurs in the ribosomes, not the Golgi apparatus.

Correct Answer: A

Rationale: The correct answer is A: Desertification. Desertification refers to the gradual loss of topsoil due to wind or water erosion, leading to the conversion of fertile land into desert-like conditions. This process is a result of unsustainable land use practices, such as overgrazing and deforestation. Leaching (B) is the process of nutrients being washed out of the soil by excess water, not specifically related to topsoil loss. Salinization (C) is the accumulation of salt in the soil, not directly related to topsoil erosion. Acidification (D) refers to the decrease in soil pH levels, not the loss of topsoil.

Correct Answer: D

Rationale: The correct answer is D because all the options are valid obstacles to achieving controlled nuclear fusion on Earth. Lack of suitable materials (A) is crucial due to extreme conditions, limited fusion fuels (B) can hinder sustained reactions, and containing plasma (C) is challenging to prevent energy loss. Therefore, all factors must be addressed for successful fusion energy production.