ATI TEAS Practice Science Test

Correct Answer: D

Rationale: The correct answer is D: Sucrase. Sucrose is a disaccharide composed of glucose and fructose. Sucrase is the enzyme responsible for breaking down sucrose into its constituent sugars, glucose, and fructose. Lactase (A) breaks down lactose, Maltase (B) breaks down maltose, and Peptidase (C) breaks down proteins. In this case, since we are dealing with sucrose from the birthday cake, the enzyme needed is sucrase to catalyze the breakdown of sucrose into its simpler sugars.

Correct Answer: B

Rationale: The correct answer is B: Prone. Prone position allows access to the stomach as the patient lies on their stomach, facilitating examination or procedures on the abdominal area. In the prone position, the stomach is easily accessible for palpation or diagnostic tests. The other choices are incorrect because: A: Medial refers to the midline of the body and does not specifically provide access to the stomach. C: Superficial refers to the location near the surface and does not relate to positioning for stomach access. D: Supine refers to lying on the back, which is not ideal for direct access to the stomach.

Correct Answer: A

Rationale: The dependent variable in a study is the outcome that is being measured or tested. In this scenario, the weight of the fish is being measured weekly as a result of being fed different amounts of food daily. The fish weight is directly influenced by the amount of food they consume, making it the dependent variable. This is the variable that changes in response to the independent variable, which is the amount of food given. Summary: A: Weight of the fish - Correct, as it is the outcome being measured. B: Type of food used - Incorrect, as this is not the variable being tested. C: Number of fish tanks - Incorrect, as this is not the variable being measured. D: Frequency of feedings - Incorrect, as this is not the outcome being tested.

Correct Answer: C

Rationale: The correct answer is C: Chromosome. A chromosome is a rod-shaped structure formed when a single DNA molecule and its associated proteins coil tightly before cell division. This coiling helps to compact the DNA and ensure it is evenly distributed to daughter cells during cell division. Centromere (A) is a specific region of a chromosome where sister chromatids are joined. Chromatid (B) refers to one of the two identical copies of a chromosome that are joined at the centromere. Gene (D) is a segment of DNA that carries the genetic information for a specific trait. Therefore, the correct answer is chromosome as it specifically describes the rod-shaped structure formed during cell division due to the coiling of DNA and proteins.

Correct Answer: C

Rationale: The correct answer is C: Flexor. Flexor muscles are responsible for bending a joint by decreasing the angle between the bones they act upon. They contract to bring two body parts closer together. Cardiac muscles (A) are found in the heart and control its pumping action. Extension (B) refers to the straightening of a joint, not bending. Smooth muscles (D) are found in various organs and are not directly involved in joint movement. Therefore, the flexor muscle (C) is the correct choice for causing a joint to bend.