ATI TEAS Science

Correct Answer: A

Rationale: The correct answer is A: The smallest amount of stimulus required for an individual to feel a sensation. The sensory threshold refers to the minimum level of stimulation needed for an individual to detect a particular sensation. This threshold varies from person to person and can be influenced by factors such as sensitivity and attention. Choice B is incorrect as it specifically relates to feeling pain, which is a different sensory experience. Choice C is incorrect as it refers to a response to a stimulus (movement) rather than the detection of sensation. Choice D is incorrect as it describes the origin of the stimulus rather than the threshold for sensation detection.

Correct Answer: C

Rationale: The somatic nervous system is responsible for voluntary movement of skeletal muscles. It controls conscious movements like walking, writing, or speaking. This system does not regulate automatic functions like breathing (option A), cognitive processes like thought (option B), or emotional responses like fear (option D). Therefore, the correct answer is C - Movement.

Correct Answer: B

Rationale: To find the molarity, we first need to calculate the moles of NaCl. Moles = mass / molar mass = 4.0g / (23.0g/mol + 35.5g/mol) = 0.056 moles. Next, we convert the volume to liters (120mL = 0.120L). Finally, molarity = moles / volume = 0.056 moles / 0.120L = 0.57 M (Choice B). Incorrect choices: A: 0.34 M - Incorrect calculation of moles or volume. C: 0.034 M - Incorrect calculation of moles or volume. D: 0.057 M - Incorrect conversion of volume to liters.

Correct Answer: A

Rationale: The correct answer is A: Mitosis. In somatic cells, mitosis is the process of cell division that results in two identical daughter cells, each with the same number of chromosomes as the parent cell. It consists of stages such as prophase, metaphase, anaphase, and telophase. Mitosis is essential for growth, repair, and maintenance of body tissues. Choice B: Meiosis is incorrect because it is the process of cell division that occurs in reproductive cells to produce gametes with half the number of chromosomes as the parent cell. Choice C: Respiration is incorrect because it is the process of converting nutrients into energy in the form of ATP, not cell division. Choice D: Cytogenesis is incorrect as it is not a term commonly used to describe the process of cell division in somatic cells.

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.