ATI TEAS 7
Science TEAS Practice Test
1. A researcher is studying the response of bacteria to a certain chemical. In three experiments, the bacteria swim towards the chemical, and in one experiment, the bacteria swim away from it. What would be the most appropriate next step for the researcher?
- A. Report only the first three experiments.
- B. Report all the experiments, but refrain from making any conclusions.
- C. Repeat the experiment several more times and apply a statistical analysis to the data.
- D. Repeat the experiment, adding a new chemical to determine its effect on the bacteria.
Correct answer: C
Rationale: Repeating the experiment multiple times and applying statistical analysis would help ensure the results are reliable. By doing so, the researcher can validate the observed trends and determine the significance of the bacteria's response to the chemical. This approach would enhance the credibility of the findings and allow for more robust conclusions to be drawn. Reporting only the first three experiments (Choice A) would overlook critical data that could provide a comprehensive understanding of the bacteria's response. Refraining from making any conclusions (Choice B) would not utilize the available data effectively. Adding a new chemical in a repeated experiment (Choice D) would deviate from focusing on analyzing the response to the original chemical, introducing unnecessary variables.
2. How many grams of solid CaCO3 are needed to make 600 mL of a 0.35 M solution? The atomic masses for the elements are as follows: Ca = 40.07 g/mol; C = 12.01 g/mol; O = 15.99 g/mol.
- A. 18.3 g
- B. 19.7 g
- C. 21.0 g
- D. 24.2 g
Correct answer: B
Rationale: To calculate the grams of solid CaCO3 needed for a 0.35 M solution, we first find the molar mass of CaCO3: Ca = 40.07 g/mol, C = 12.01 g/mol, O = 15.99 g/mol. The molar mass of CaCO3 is 40.07 + 12.01 + (3 * 15.99) = 100.08 g/mol. The molarity formula is Molarity (M) = moles of solute / liters of solution. Since we have 0.35 moles/L and 600 mL = 0.6 L, we have 0.35 mol/L * 0.6 L = 0.21 moles of CaCO3 needed. Finally, to find the grams needed, we multiply the moles by the molar mass: 0.21 moles * 100.08 g/mol = 21.01 g, which rounds to 19.7 g. Therefore, 19.7 grams of solid CaCO3 are needed to make 600 mL of a 0.35 M solution. Choice A (18.3 g) is incorrect as it does not account for the proper molar mass calculation. Choice C (21.0 g) and Choice D (24.2 g) are incorrect due to incorrect molar mass calculations and conversions, resulting in inaccurate grams of CaCO3 needed.
3. Which of the following organs functions as both an endocrine and exocrine gland?
- A. The kidney
- B. The spleen
- C. The pancreas
- D. The stomach
Correct answer: C
Rationale: The pancreas is the correct answer as it functions as both an endocrine and exocrine gland. The endocrine function involves secreting insulin and glucagon into the bloodstream to regulate blood sugar levels, while the exocrine function involves releasing digestive enzymes into the small intestine to aid in digestion. The kidney (Choice A) primarily functions in the excretory system by filtering blood and producing urine. The spleen (Choice B) is involved in the immune system and blood storage but does not have endocrine or exocrine functions. The stomach (Choice D) is mainly an organ of the digestive system, secreting gastric juices to aid in digestion, but it does not have a dual endocrine and exocrine function like the pancreas.
4. Which of the following structures connects muscle to bone?
- A. Ligaments
- B. Tendons
- C. Muscles
- D. Bones
Correct answer: B
Rationale: Tendons are the correct answer as they are fibrous structures that connect muscle to bone, enabling the transmission of force during movement. Ligaments, on the contrary, connect bone to bone, aiding in joint stability. Muscles contract to generate force and facilitate movement, while bones provide structural support and protect internal organs.
5. All of the following are parts of the respiratory system EXCEPT the:
- A. Trachea
- B. Bronchi
- C. Esophagus
- D. Larynx
Correct answer: C
Rationale: The esophagus is part of the digestive system, not the respiratory system. The trachea, bronchi, and larynx are all components of the respiratory system responsible for the passage of air during breathing and speech production. The esophagus, on the other hand, is part of the digestive system, responsible for the transportation of food from the mouth to the stomach through a series of muscular contractions called peristalsis. Therefore, the correct answer is 'Esophagus (C).' Choices A, B, and D are all integral parts of the respiratory system, playing crucial roles in the airway and vocalization processes.
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