ATI TEAS Science

Correct Answer: A

Rationale: The correct answer is A: A control. A control in an experiment is used as a standard for comparison because it remains unchanged and is not subjected to the experimental treatment. By comparing the results of the experimental group to the control group, researchers can determine the effectiveness of the treatment. Variables (B) and constants (C) are factors that are manipulated or kept consistent, respectively, in an experiment but do not serve as a standard for comparison. Collected data (D) is the outcome of the experiment and is not used as a standard for comparison.

Correct Answer: A

Rationale: The correct order for increasing amounts of permitted motion is hinge joint (least mobile), condyloid joint, and saddle joint (most mobile). A: Hinge joint allows movement in one plane (least mobile), followed by condyloid joint with two planes, and then saddle joint with more freedom of movement. B: Incorrect order as saddle joint is more mobile than hinge joint. C: Incorrect order as hinge joint should be first, followed by condyloid and then saddle joint. D: Incorrect order as saddle joint should be the most mobile joint in the list.

Correct Answer: A

Rationale: The correct answer is A: They're both accurate and precise. Rationale: 1. Accuracy: The measurements are close to the accepted value of 9.8 m/s^2, with a range of 9.78-9.81 m/s^2. 2. Precision: The measurements are consistent and clustered closely around the true value, indicating precision. 3. The slight variations in measurements are expected due to experimental error but still fall within an acceptable range. In summary, the measurements are accurate as they are close to the true value, and they are precise as they are clustered closely together. Other choices are incorrect because they do not accurately reflect the situation based on the provided data.

Correct Answer: A

Rationale: The correct answer is A: Merkel's discs. Merkel's discs are located in the epidermis and respond to light touch and slower vibrations due to their sensitivity to sustained pressure. Pacinian corpuscles (B) detect deep pressure and fast vibrations. Meissner's corpuscles (C) are responsible for detecting light touch but not vibrations. Ruffini endings (D) respond to skin stretch and warmth but not specifically to light touch and slower vibrations. Therefore, Merkel's discs are the most appropriate choice for receptors that respond to light touch and slower vibrations.

Correct Answer: C

Rationale: The correct answer is C: Retina. Visual processing begins in the retina because it contains specialized cells called photoreceptors (rods and cones) that convert light into electrical signals. These signals are then transmitted through the optic nerve to the brain for further processing. The cornea (A) is the transparent outer layer of the eye that helps focus light, the optic nerve (B) transmits signals from the retina to the brain, and the eyelid (D) is a protective covering for the eye and does not play a role in visual processing.