TEAS 7 Science Practice Test

Correct Answer: A

Rationale: The correct answer is A. Progesterone is not responsible for the expression of secondary sexual characteristics, such as enlarged breasts. Progesterone's main functions in the female reproductive system are to regulate and prepare the endometrial lining of the uterus for potential pregnancy, inhibit contractions of the uterus as the ovum is released, and stimulate milk production in the breasts. Enlarged breasts are primarily influenced by estrogen, another hormone in the female reproductive system. Thus, A is the correct answer as it does not align with the known functions of progesterone.

Correct Answer: B

Rationale: The correct answer is B: make observations. This is the initial step of the scientific method because it involves gathering information about a phenomenon or problem. Observations help in identifying patterns, trends, and potential areas for investigation. Forming a hypothesis (A) comes after making observations, as it is a proposed explanation based on those observations. Analyzing data (C) and forming a question (D) also follow after making observations. Making observations is crucial as it sets the foundation for the rest of the scientific method process.

Correct Answer: D

Rationale: The correct answer is D: insulin production and blood sugar regulation. The liver is not responsible for insulin production; it is produced by the pancreas. The liver does play a role in blood sugar regulation by storing and releasing glucose, but it is not the primary organ for insulin production. The other choices (A, B, C) are functions of the liver: A) nutrient processing involves metabolizing and storing nutrients, B) blood filtration and detoxification involves removing toxins from the blood, and C) cholesterol and lipoprotein production involves synthesizing cholesterol and lipoproteins.

Correct Answer: D

Rationale: The correct answer is D: cytotoxic T cells. These cells are a type of white blood cell that plays a key role in adaptive immunity by identifying and destroying infected cells. Step 1: Cytotoxic T cells recognize specific antigens on infected cells. Step 2: They release cytotoxic chemicals to destroy the infected cells. Step 3: This process helps eliminate pathogens and infected cells from the body. Memory B cells (A) are responsible for producing antibodies upon re-exposure to a pathogen, not directly attacking pathogens. Neutrophils (B) are phagocytic cells that engulf pathogens but are not specific to adaptive immunity. Antibodies (C) are proteins produced by B cells that bind to pathogens to facilitate their destruction but do not directly attack pathogens like cytotoxic T cells.

Correct Answer: A

Rationale: The correct answer is A: calcium. Bone is primarily composed of calcium phosphate, which provides strength and rigidity to the bone structure. Calcium is crucial for bone formation and mineralization. Magnesium and potassium are important for various bodily functions but are not the primary components of bone. Collagen is a protein that provides flexibility and support but is not an inorganic material found in bones.