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: 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: C

Rationale: The correct answer is C, Epididymis. Sperm maturation occurs in the epididymis, a coiled tube located on the back of each testicle. Here, sperm gain motility and the ability to fertilize an egg. Seminal vesicles (A) and prostate gland (B) produce fluids that combine with sperm to form semen but do not play a role in sperm maturation. Vas deferens (D) is a tube that carries mature sperm from the epididymis to the urethra but is not the site of sperm maturation.

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: A

Rationale: The correct answer is A: A plasma membrane. Both prokaryotes and eukaryotes have a plasma membrane as their outer boundary. The plasma membrane is essential for maintaining cell integrity, controlling the passage of molecules in and out of the cell, and facilitating communication with the external environment. Prokaryotes lack a nucleus enclosed by a membrane (choice B), which is a defining feature of eukaryotic cells. Eukaryotes have organelles (choice C) that are membrane-bound structures, unlike prokaryotes that lack membrane-bound organelles. A nucleoid (choice D) is a region in prokaryotic cells where the genetic material is located, but it is not enclosed by a membrane like the nucleus in eukaryotic cells.