ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C: Nucleus. The nucleus is responsible for controlling the activities of the cell because it houses the cell's DNA, which contains instructions for cellular functions. It regulates gene expression and controls the production of proteins. The Golgi apparatus (choice A) is involved in processing and packaging proteins. Mitochondria (choice B) are responsible for energy production. Ribosomes (choice D) are responsible for protein synthesis. However, the nucleus is the main organelle that directly regulates and controls the activities of the cell.

Correct Answer: C

Rationale: Gold (C) is the correct answer because it is highly malleable and does not tarnish. Gold is a popular choice for jewelry due to its durability and resistance to corrosion. Iron (A) is not commonly used in jewelry due to its susceptibility to rust. Copper (B) is malleable but prone to tarnishing. Silver (D) is malleable but can tarnish over time, making it less ideal for long-lasting jewelry pieces.

Correct Answer: A

Rationale: The correct answer is A: Group 1. Alkali metals are located in Group 1 of the periodic table because they have one electron in their outermost shell, making them highly reactive. These elements include lithium, sodium, potassium, and others. Group 2 (Choice B) consists of alkaline earth metals, Group 7 (Choice C) consists of halogens, and Group 8 (Choice D) consists of noble gases. Alkali metals exhibit unique properties due to their single valence electron, distinguishing them from elements in the other groups mentioned.

Correct Answer: A

Rationale: Gas exchange takes place in the alveoli, which are tiny air sacs at the end of the bronchioles. Alveoli have a large surface area and thin walls, allowing for efficient exchange of oxygen and carbon dioxide. Bronchioles, bronchi, and trachea are part of the airway passages and are not directly involved in gas exchange. Alveoli are specifically designed for gas exchange due to their structure and proximity to the capillaries.

Correct Answer: B

Rationale: The correct answer is B: One layer. Simple epithelium consists of a single layer of cells. This arrangement allows for efficient diffusion and absorption due to the short distance between cells and the underlying tissues. Option A is incorrect because epithelial tissue always has at least one layer. Option C is incorrect as it describes stratified epithelium, which has two or more layers. Option D is incorrect as it refers to stratified squamous epithelium, not simple epithelium.