ATI TEAS 7
TEAS 7 practice test free science
1. What is the periodic law?
- A. The statement that the properties of the elements are a periodic function of their atomic numbers.
- B. The statement that elements can be arranged in a table where elements with similar properties are grouped together.
- C. The statement that elements can be arranged in a table where the atomic number of an element is equal to the number of protons in its nucleus.
- D. The statement that elements can be arranged in a table where the atomic mass of an element is equal to the number of neutrons in its nucleus.
Correct answer: A
Rationale: The periodic law states that the properties of elements are a periodic function of their atomic numbers. This means that when elements are arranged in order of increasing atomic number, there is a periodic repetition of their properties. This forms the basis for the modern periodic table. Option B describes the organization of elements in the periodic table, which is related to the periodic law but not the definition of it. Options C and D are incorrect as they describe concepts related to atomic structure (atomic number and atomic mass) rather than the periodic law itself.
2. Which division of the peripheral nervous system is responsible for transmitting signals from the central nervous system to skeletal muscles, enabling voluntary muscle movements?
- A. Somatic nervous system
- B. Autonomic nervous system
- C. Sympathetic nervous system
- D. Parasympathetic nervous system
Correct answer: A
Rationale: The correct answer is the somatic nervous system. The somatic nervous system is responsible for transmitting signals from the central nervous system to skeletal muscles, allowing for voluntary muscle movements. The autonomic nervous system, sympathetic nervous system, and parasympathetic nervous system are not involved in voluntary muscle movements. Instead, they regulate involuntary functions of the body such as heart rate, digestion, and breathing. Therefore, choices B, C, and D are incorrect as they are not associated with voluntary muscle movements.
3. What is the process of converting light energy into chemical energy called?
- A. Respiration
- B. Fermentation
- C. Photosynthesis
- D. Hydrolysis
Correct answer: C
Rationale: - Respiration (Option A) is the process by which cells break down glucose to release energy. - Fermentation (Option B) is an anaerobic process that also involves the breakdown of glucose to release energy. - Hydrolysis (Option D) is a chemical process that involves the breakdown of molecules by adding water. Photosynthesis (Option C) is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. During photosynthesis, plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. This process is essential for the survival of plants and ultimately sustains life on Earth by providing oxygen for other organisms to breathe and serving as a source of energy in the food chain.
4. When making a dilution, what do you do?
- A. Add more solvent to a concentrated solution
- B. Change the temperature of the solution
- C. Decrease the concentration of a solution
- D. All of the above
Correct answer: C
Rationale: When making a dilution, you decrease the concentration of a solution by adding more solvent to a concentrated solution. This process does not involve changing the temperature of the solution, so option B is incorrect. Option A is also incorrect because you are not adding more solute to the solution during dilution. Therefore, the correct answer is C) Decrease the concentration of a solution. Options A and B are incorrect as dilution involves adding more solvent, not solute, and does not require changing the temperature of the solution.
5. Which of the following hormones is produced by the adrenal medulla and prepares the body for a stressful situation?
- A. Testosterone
- B. Cortisol
- C. Epinephrine (adrenaline)
- D. Growth hormone
Correct answer: C
Rationale: The correct answer is C: Epinephrine (adrenaline). Epinephrine is produced by the adrenal medulla and is responsible for preparing the body for a stressful situation. It increases heart rate, dilates airways, and mobilizes energy stores to help the body respond to a fight-or-flight scenario. Testosterone (Choice A) is a sex hormone produced by the testes in males and in smaller amounts by the ovaries in females, not by the adrenal medulla. Cortisol (Choice B) is a stress hormone produced by the adrenal cortex, not the adrenal medulla. Growth hormone (Choice D) is produced by the pituitary gland and is involved in growth, metabolism, and various bodily functions, not by the adrenal medulla.
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