TEAS 7 Science Practice Test

Correct Answer: A

Rationale: Correct Answer: A - A strong acid completely ionizes in water. Rationale: 1. Strong acids fully dissociate into ions in water, leading to a high concentration of H+ ions. 2. This complete ionization results in a low pH. 3. Strong acids do not reversibly donate more than one proton or contain metal atoms. 4. Strong acids can decompose under certain conditions, so choice D is incorrect.

Correct Answer: C

Rationale: The correct answer is C: controlled experiment. In a controlled experiment, the researcher manipulates one or more independent variables to observe the effect on the dependent variable, while controlling for other variables. In this scenario, the researcher is controlling the conditions and variables to study the impact of the manipulated independent variable on the dependent variable. Incorrect choices: A: Field experiment involves conducting research in real-world settings, which may not necessarily involve manipulation of variables. B: Natural experiment involves observing naturally occurring events without any manipulation by the researcher. D: Observational study involves observing and recording data without any intervention or manipulation of variables.

Correct Answer: A

Rationale: The correct answer is A, pancreas and salivary glands. Amylase is an enzyme that breaks down starch into sugars. Salivary glands produce salivary amylase, which starts the digestion of carbohydrates in the mouth. The pancreas also produces pancreatic amylase, which further digests carbohydrates in the small intestine. Gall bladder and liver do not produce amylase. Therefore, choices B, C, and D are incorrect as they do not align with the production sites of amylase in the digestive system.

Correct Answer: C

Rationale: The correct answer is C: Antibodies. Adaptive immunity involves the body's ability to recognize and remember specific pathogens, such as viruses or bacteria. Antibodies are proteins produced by the immune system in response to these specific pathogens, providing targeted defense. In contrast, choices A and B (inflammation and fever) are examples of innate immunity, which are non-specific responses to pathogens. Choice D, phagocytosis, is a component of both innate and adaptive immunity, involving the engulfment and destruction of pathogens by immune cells. However, antibodies represent a key feature of adaptive immunity by specifically targeting and neutralizing pathogens.

Correct Answer: C

Rationale: The correct answer is C: lipids. Lipids are non-soluble in water due to their hydrophobic nature. They are composed of hydrocarbons, such as fatty acids, which provide a concentrated source of energy storage in the body. Carbohydrates (choice A) are soluble and primarily serve as a quick energy source. Nucleic acids (choice B) are involved in genetic information storage and transfer. Proteins (choice D) are made up of amino acids and have various functions in the body, but they are not typically used for energy storage. Therefore, lipids are the only option that fits all the criteria given in the question.