TEAS Practice Test Science

Correct Answer: B

Rationale: Correct Answer: B (Define the problem) Rationale: 1. Defining the problem is the first step in the scientific method to identify the research focus. 2. It helps in formulating specific research questions and objectives. 3. Before gathering qualitative data, having a clear problem statement is essential to guide the research process. Incorrect Choices: A: Communicating with a scientific journal is not a step in the scientific method, but rather a later stage after conducting research. C: Developing a hypothesis comes after defining the problem to propose a possible explanation for the research question. D: Categorizing data for statistical analysis is done after data collection, not before gathering qualitative data.

Correct Answer: B

Rationale: Hydrophobic proteins often provide structural support in the body. This is because hydrophobic proteins have non-polar amino acids that interact with each other to form stable structures. These proteins are commonly found in cell membranes, connective tissues, and structural proteins like collagen. They are crucial for maintaining the shape and integrity of cells and tissues. Incorrect Choices: A: Digestive enzymes - Hydrophobic proteins are not commonly involved in digestive processes. C: Carry oxygen molecules - Oxygen-carrying proteins like hemoglobin are typically hydrophilic, not hydrophobic. D: Store energy - Energy storage is usually performed by molecules like carbohydrates and lipids, not hydrophobic proteins.

Correct Answer: B

Rationale: The correct answer is B: Fight infection. White blood cells are a crucial part of the immune system, responsible for identifying and attacking foreign invaders such as bacteria, viruses, and other pathogens. They play a key role in defending the body against infections and diseases. Choices A, C, and D are incorrect because white blood cells do not primarily function in transporting oxygen, producing antibodies, or regulating body temperature. Oxygen transport is mainly the role of red blood cells, antibody production is the function of B cells, and body temperature regulation involves processes such as sweating and shivering controlled by the hypothalamus.

Correct Answer: D

Rationale: The correct answer is D: Ventilation. Ventilation specifically refers to the mechanical act of breathing, which involves the movement of air in and out of the lungs. This process is essential for the exchange of oxygen and carbon dioxide in the body. A: Diffusion is the process of molecules moving from an area of high concentration to an area of low concentration. While diffusion plays a role in gas exchange during respiration, it is not the mechanical act of breathing itself. B: Perfusion refers to the process of blood flow through the tissues. Although perfusion is vital for delivering oxygen to the body's cells, it is not the mechanical act of breathing. C: Respiration encompasses the entire process of gas exchange in the body, including both ventilation and the exchange of gases at the cellular level. While respiration is closely related to breathing, it is not specifically the mechanical act of breathing.

Correct Answer: D

Rationale: The correct answer is D: Vacuole. Vacuoles are responsible for storing food, water, and other materials in the cell. They help maintain turgor pressure and regulate the cell's internal environment. Centrioles are involved in cell division, lysosomes contain digestive enzymes, and ribosomes are responsible for protein synthesis. So, A, B, and C are incorrect choices for food and water storage in the cell.