TEAS 7 Science Practice Test

Correct Answer: C

Rationale: The correct answer is C because isotopes are atoms of the same element that have different numbers of neutrons. Neutrons are the subatomic particles that do not have a charge and are found in the nucleus of an atom. Different isotopes of an element have the same number of protons (which determines the element's identity) but vary in the number of neutrons, leading to differences in atomic mass. This distinction in neutron number is the defining characteristic of isotopes. Choices A, B, and D are incorrect: A: Isotopes do not have different ionic charges as they have the same number of protons and electrons, maintaining overall charge neutrality. B: Isotopes can be found across different groups on the periodic table, not restricted to the same group. D: Isotopes can have the same electron configurations since electrons are primarily determined by the number of protons in the nucleus, which remains constant for isotopes of the same element.

Correct Answer: D

Rationale: Peristalsis is the correct term as it refers to the rhythmic muscle contractions that propel food through the digestive tract. First, the circular muscles contract behind the food bolus, pushing it forward. Then, the longitudinal muscles contract, shortening the tract and pushing the food further. This process continues in a wave-like fashion, aiding in digestion. A: Digestion refers to the breakdown of food into smaller molecules. B: Deglutition is the process of swallowing food. C: Defecation is the elimination of waste from the body. Therefore, peristalsis is the correct term as it specifically describes the muscle contractions that move food through the digestive system.

Correct Answer: D

Rationale: The correct answer is D: Combustion reaction. In a combustion reaction, a compound reacts with oxygen gas to produce carbon dioxide and water. In this equation, 2C₆H₁₄ (hexane) reacts with 19O₂ to produce 12CO (carbon monoxide) and 14H₂O (water). This reaction is characteristic of combustion, where a fuel (hexane) reacts with oxygen to release energy in the form of heat and light. Summary: A: Substitution reaction involves replacing one element or group in a compound with another element or group. This is not demonstrated in the given equation. B: Acid-base reaction involves the transfer of protons between substances. There are no acids or bases involved in the given equation. C: Enzyme reaction involves the catalysis of a chemical reaction by an enzyme. Enzymes are not mentioned in the given equation.

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: A

Rationale: The correct answer is A because fascia functions to enclose, protect, support, and separate muscle tissue. Fascia is a connective tissue that surrounds muscles, providing structural integrity, protecting muscles from friction, and allowing for movement while maintaining muscle shape. It also separates muscles into compartments, assisting in the coordination of muscle actions. Choices B, C, and D are incorrect because fascia does not primarily connect muscle tissue to bone, serve as the contractile unit of muscle, or directly interact with actin protein cells to create muscle contractions.