ATI TEAS Science

Correct Answer: A

Rationale: The correct answer is A because all types of muscle tissue share the properties of being contractile (ability to contract), excitable (responsive to stimuli), elastic (ability to return to original shape), and extensible (ability to stretch). Choice B is incorrect because voluntary is not a shared property of all muscle tissues. Choice C is incorrect because voluntary is not a shared property of all muscle tissues. Choice D is incorrect because voluntary is not a shared property of all muscle tissues.

Correct Answer: B

Rationale: The correct answer is B: A model. Models are representations that simplify complex phenomena, making them easier to study and understand. They often simulate natural patterns or occurrences that are challenging or impossible to directly experience. Models help researchers make predictions and test hypotheses. A: A theory is an explanation based on observed facts and supported by evidence. Theories provide frameworks to understand natural phenomena but are not direct representations of patterns that are difficult to experience. C: A law is a statement that describes a fundamental principle of nature based on repeated observations. Laws summarize patterns in nature but do not necessarily represent occurrences that are difficult to experience directly. D: An observation involves directly witnessing or perceiving a natural event. Observations are direct experiences and do not fall under the category of representing patterns that are hard to experience directly.

Correct Answer: A

Rationale: Platelets are responsible for clotting by forming a plug at the site of injury. They release chemicals to initiate clotting cascades. Red blood cells transport oxygen, antigens are markers on cells, and plasma cells are involved in immune response, not clotting. Therefore, the correct answer is A.

Correct Answer: D

Rationale: Certainly! The correct answer is D because synergists assist primary movers (A), stabilize the point of origin while providing extra pull near the insertion (B), and help prevent unwanted movement at a joint (C). Synergists work together with the primary mover to facilitate smooth and efficient movement. Option A explains how synergists assist the primary movers in completing specific movements by adding force. Option B highlights the role of synergists in stabilizing the origin and providing additional force near the insertion point. Option C emphasizes that synergists help to stabilize the joint, preventing unnecessary movements and ensuring proper execution of the desired motion. Therefore, all the options (A, B, and C) collectively describe the functions of synergists, making option D the correct choice.

Correct Answer: B

Rationale: The correct answer is B: Secondary structure. Secondary structure is defined by the local folds and coils in the protein's polypeptide backbone, such as alpha helices and beta sheets. This level of structure does not involve interactions between different regions of the protein (tertiary) or multiple protein subunits (quaternary). Primary structure (A) refers to the linear sequence of amino acids. Tertiary structure (C) involves the 3D arrangement of secondary structures and other elements in a single polypeptide chain. Quaternary structure (D) pertains to the arrangement of multiple polypeptide subunits in a protein complex.