ATI TEAS Version 7 - Science
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Free ATI TEAS Version 7 - Science Questions
Which of the following is true of a mixture of water and NaCl?
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Water is the solute and NaCl is the solvent.
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Hydration spheres form with sodium and chloride ions surrounding the water molecules.
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NaCl is hydrophobic and will not dissolve in water.
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The oxygen atom of the water molecules is attracted to the sodium cations.
Explanation
Correct Answer:
The oxygen atom of the water molecules is attracted to the sodium cations.
Explanation:
In a solution of NaCl and water, NaCl dissociates into Na⁺ and Cl⁻ ions, and water molecules surround these ions due to their polarity. The oxygen atom in water is partially negative, so it is attracted to the positively charged sodium ions (Na⁺). Conversely, the hydrogen atoms in water are partially positive and are attracted to the negatively charged chloride ions (Cl⁻), forming hydration shells.
Why Other Options Are Wrong:
Water is the solute and NaCl is the solvent.
This is incorrect because in this solution, water is the solvent and NaCl is the solute. The solute is what is dissolved, and the solvent is the substance doing the dissolving.
Hydration spheres form with sodium and chloride ions surrounding the water molecules.
This is incorrect because hydration spheres form around the Na⁺ and Cl⁻ ions, not the water molecules. Water surrounds the ions, not the other way around.
NaCl is hydrophobic and will not dissolve in water.
This is incorrect because NaCl is hydrophilic, meaning it dissolves well in water due to ionic interactions with polar water molecules.
- Observation, hypothesis, prediction, experimentation, analysis, conclusion.
- Hypothesis, observation, prediction, experimentation, analysis, conclusion.
- Prediction, observation, experimentation, analysis, conclusion, hypothesis.
- Observation, data collection, analysis, experimentation, hypothesis, conclusion.
Explanation
- leaves the aorta
- fills the right atrium
- reaches body tissues
- flows through arteries
Explanation
A student is making sodium carbonate (Na₂CO₃) by heating sodium bicarbonate (NaHCO₃) in a closed container according to the following reaction:
2NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
Which of the following actions will result in an increase in the yield of Na₂CO₃?
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Shaking the container
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Cooling the container
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Increasing the amount of NaHCO₃
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Adding CO₂ to the container
Explanation
Correct Answer:
Increasing the amount of NaHCO₃
Explanation:
According to Le Chatelier’s Principle, increasing the amount of a reactant (in this case, NaHCO₃) will shift the equilibrium toward the products, leading to greater formation of Na₂CO₃. Since NaHCO₃ is the starting material, having more of it allows more product to be formed when heated, thereby increasing the yield of sodium carbonate.
Why Other Options Are Wrong:
Shaking the container
This is incorrect because physical agitation does not affect the chemical equilibrium of a reaction involving solids and gases. It does not influence the position of equilibrium or the yield.
Cooling the container
This is incorrect because the reaction is endothermic (requires heat). Cooling the system would shift the equilibrium toward the reactants, reducing the yield of Na₂CO₃.
Adding CO₂ to the container
This is incorrect because adding a product (CO₂) would shift the equilibrium toward the reactants, according to Le Chatelier’s Principle, decreasing the yield of Na₂CO₃.
Which of the following is an example of a biological macromolecule
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Nucleic acid
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Monosaccharide
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Amino acid
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Protein
Explanation
Correct Answer D. Protein
Explanation of Correct Answer:
A biological macromolecule is a large, complex molecule made up of smaller subunits. Proteins are classic examples of macromolecules — they are made from long chains of amino acids and perform a wide range of essential functions in the body, including structural support, transport, and enzymatic activity.
Why the Other Options Are Incorrect:
A. Nucleic acid
Nucleic acids like DNA and RNA are biological macromolecules, but the question asks for an example, and protein is a more complete and commonly referenced answer in this context.
B. Monosaccharide
A monosaccharide (e.g., glucose) is a monomer, not a macromolecule. It is a building block of carbohydrates, which are macromolecules.
C. Amino acid
An amino acid is the monomer unit of proteins, not a macromolecule itself.
Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell
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Cytokines
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Perforin
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Lysozymes
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Granzymes
Explanation
Correct Answer A. Cytokines
Explanation:
Cytokines are signaling proteins released by immune cells (such as T cells and macrophages) to communicate with and activate other immune cells. They help regulate the intensity and duration of immune responses by promoting cell growth, differentiation, and movement. For example, helper T cells release cytokines that activate B cells and cytotoxic T cells, coordinating the immune response.
Why the Other Options Are Incorrect:
B. Perforin
Perforin is released by cytotoxic T cells and natural killer (NK) cells to create pores in the membranes of target (infected or cancerous) cells, not to activate other immune cells.
C. Lysozymes
Lysozymes are enzymes found in bodily secretions like saliva and tears that break down bacterial cell walls, offering a form of nonspecific immune defense. They do not activate immune cells.
D. Granzymes
Granzymes are enzymes delivered into target cells by cytotoxic T cells and NK cells through the pores created by perforin. They trigger cell death (apoptosis) in the target cells but do not activate immune cells.
. Which of the following lists the order of tissues in the gastrointestinal tract, from the innermost layer to the outermost layer
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Submucosa, mucosa, serosa, muscularis
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Muscularis, serosa, mucosa, submucosa
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Serosa, mucosa, submucosa, muscularis
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Mucosa, submucosa, muscularis, serosa
Explanation
Correct Answer D. Mucosa, submucosa, muscularis, serosa
Explanation:
The gastrointestinal (GI) tract wall has four main tissue layers, organized consistently from the innermost to the outermost. The innermost layer is the mucosa, which comes in direct contact with ingested food and is responsible for secretion, absorption, and protection. Next is the submucosa, a connective tissue layer containing blood vessels, lymphatics, and nerves. Surrounding the submucosa is the muscularis, which facilitates peristalsis and segmentation to propel food along the GI tract. The outermost layer is the serosa, a protective membrane that reduces friction between the GI tract and surrounding organs.
Why the Other Options Are Incorrect:
A. Submucosa, mucosa, serosa, muscularis
This order incorrectly places the submucosa before the mucosa when the mucosa should be the innermost. It also places serosa before muscularis, which is not anatomically correct.
B. Muscularis, serosa, mucosa, submucosa
This option starts with the muscularis as the innermost, which is wrong because the mucosa is the innermost layer lining the GI tract lumen.
C. Serosa, mucosa, submucosa, muscularis
This option incorrectly begins with the serosa (the outermost layer) and then moves inward, but the sequence within is still wrong and mixed up.
- Plants need more than 200 mL of liquid per week.
- Salt has no impact on plant health.
- Salt contains useful nutrients for plants.
- A combination of the solutions tested will produce healthier plants.
Explanation
This is the most logical hypothesis because it can be directly tested by adjusting one variable—the amount of liquid—while keeping other factors constant (light, type of solution, number of plants). Since several plants died despite receiving the same light and solution types, the class can now test whether increasing water volume improves plant survival and color.
- The shape and surface area of the object.
- The mass and volume of the object.
- The acceleration and momentum of the object.
- The height and distance of the fall.
Explanation
- Lowering the potential energy of the products
- Separating inhibitors from products
- Forming a complex with the products
- Lowering the activation energy of the reaction
Explanation
Enzymes function as biological catalysts that speed up chemical reactions without being consumed in the process. They do this by lowering the activation energy, which is the minimum amount of energy required for reactants to form products. By binding to substrates at their active site, enzymes stabilize the transition state and allow reactions to occur more rapidly under normal body conditions.
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