ATI TEAS 7
TEAS 7 practice test science
1. Why is the electrical conductivity of a strong acid solution higher than that of a weak acid solution?
- A. Strong acids are more concentrated.
- B. Strong acids release more hydrogen ions.
- C. Weak acids are better at dissolving salts.
- D. Strong acids have a lower pH.
Correct answer: B
Rationale: The correct answer is B because strong acids release more hydrogen ions compared to weak acids. This higher concentration of ions in the solution leads to a higher electrical conductivity. Strong acids ionize completely in solution, producing a higher concentration of ions that can conduct electricity, whereas weak acids only partially ionize, resulting in a lower concentration of ions and lower electrical conductivity. Choice A is incorrect because the concentration of the acid does not directly determine its electrical conductivity. Choice C is incorrect as the ability to dissolve salts is not directly related to electrical conductivity. Choice D is incorrect because the pH of the solution, although related to acidity, does not directly determine the electrical conductivity.
2. In which regions of the digestive system is amylase produced?
- A. pancreas and salivary glands
- B. gall bladder and salivary glands
- C. gall bladder and liver
- D. pancreas and liver
Correct answer: A
Rationale: Amylase is an enzyme that breaks down carbohydrates into smaller sugars. It is produced in the pancreas and salivary glands. The salivary glands release amylase into the mouth during chewing, where it initiates the breakdown of carbohydrates. The pancreas also secretes amylase into the small intestine to further assist in carbohydrate digestion. Choices B, C, and D are incorrect as the gall bladder does not produce amylase, and the liver's primary function is not the production of amylase for carbohydrate breakdown.
3. What information does a genotype provide that a phenotype does not?
- A. The genotype necessarily includes the proteins coded for by its alleles.
- B. The genotype will always display an organism's recessive alleles.
- C. The genotype must include the organism's physical characteristics.
- D. The genotype indicates what an organism's parents looked like.
Correct answer: A
Rationale: The genotype provides information about the specific genetic makeup of an organism, including the alleles it possesses for a particular trait. This information is not always directly reflected in the phenotype, which is the observable physical characteristics of an organism. The genotype determines the proteins coded for by its alleles, but the phenotype is the expression of those proteins in the organism's traits. Therefore, the genotype necessarily includes the proteins coded for by its alleles, a detail not provided solely by the phenotype.\nChoice B is incorrect because the genotype may include dominant alleles as well, not just recessive ones. Choice C is incorrect because the genotype refers to genetic information, not physical characteristics. Choice D is incorrect because the genotype does not directly indicate what an organism's parents looked like; it primarily describes the genetic information inherited from parents.
4. What is the process by which muscles convert chemical energy (ATP) into mechanical energy (movement)?
- A. Photosynthesis
- B. Cellular respiration
- C. Muscle contraction
- D. The sliding filament theory
Correct answer: C
Rationale: Muscle contraction is the correct answer. It is the process by which muscles convert chemical energy (ATP) into mechanical energy (movement). During muscle contraction, the sliding filament theory explains how actin and myosin filaments slide past each other, causing muscle fibers to shorten and generate force. Photosynthesis (option A) is the process by which plants convert light energy into chemical energy. Cellular respiration (option B) is the process by which cells generate ATP from glucose and oxygen. The sliding filament theory (option D) is a detailed explanation of the molecular events that occur during muscle contraction but is not the overall process of converting energy into movement; it focuses on the mechanism within the process of muscle contraction.
5. What is the primary purpose of control rods within a nuclear reactor?
- A. Reflecting neutrons back into the core
- B. Absorbing excess neutrons to control criticality
- C. Moderating the velocity of neutrons
- D. All of the above
Correct answer: B
Rationale: The primary purpose of control rods in a nuclear reactor is to absorb excess neutrons to control criticality. When inserted into the reactor core, control rods absorb neutrons, reducing the number available for sustaining the fission chain reaction. This action allows operators to manage the reactor power levels and prevent overheating or runaway reactions. Reflecting neutrons back into the core and moderating neutron velocity are not the primary functions of control rods in a nuclear reactor. Choice A is incorrect because control rods do not reflect neutrons back into the core but absorb them. Choice C is incorrect as the moderation of neutron velocity is typically achieved by other materials like a moderator (e.g., water, graphite) rather than control rods. Choice D is incorrect as control rods do not reflect neutrons or moderate neutron velocity, making it an incorrect option.
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